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Kaur R, Gupta S, Tripathi V, Bharadwaj A. Unravelling the secrets of soil microbiome and climate change for sustainable agroecosystems. Folia Microbiol (Praha) 2024:10.1007/s12223-024-01194-9. [PMID: 39249146 DOI: 10.1007/s12223-024-01194-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Accepted: 08/20/2024] [Indexed: 09/10/2024]
Abstract
The soil microbiota exhibits an important function in the ecosystem, and its response to climate change is of paramount importance for sustainable agroecosystems. The macronutrients, micronutrients, and additional constituents vital for the growth of plants are cycled biogeochemically under the regulation of the soil microbiome. Identifying and forecasting the effect of climate change on soil microbiomes and ecosystem services is the need of the hour to address one of the biggest global challenges of the present time. The impact of climate change on the structure and function of the soil microbiota is a major concern, explained by one or more sustainability factors around resilience, reluctance, and rework. However, the past research has revealed that microbial interventions have the potential to regenerate soils and improve crop resilience to climate change factors. The methods used therein include using soil microbes' innate capacity for carbon sequestration, rhizomediation, bio-fertilization, enzyme-mediated breakdown, phyto-stimulation, biocontrol of plant pathogens, antibiosis, inducing the antioxidative defense pathways, induced systemic resistance response (ISR), and releasing volatile organic compounds (VOCs) in the host plant. Microbial phytohormones have a major role in altering root shape in response to exposure to drought, salt, severe temperatures, and heavy metal toxicity and also have an impact on the metabolism of endogenous growth regulators in plant tissue. However, shelf life due to the short lifespan and storage time of microbial formulations is still a major challenge, and efforts should be made to evaluate their effectiveness in crop growth based on climate change. This review focuses on the influence of climate change on soil physico-chemical status, climate change adaptation by the soil microbiome, and its future implications.
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Affiliation(s)
- Rasanpreet Kaur
- Department of Biotechnology, IAH, GLA University, Mathura, India
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
| | - Saurabh Gupta
- Department of Biotechnology, IAH, GLA University, Mathura, India.
| | - Vishal Tripathi
- Department of Biotechnology, Graphic Era (Deemed to Be University), Dehradun, 248002, Uttarakhand, India.
| | - Alok Bharadwaj
- Department of Biotechnology, IAH, GLA University, Mathura, India
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2
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Lee S, Kim JA, Song J, Choe S, Jang G, Kim Y. Plant growth-promoting rhizobacterium Bacillus megaterium modulates the expression of antioxidant-related and drought-responsive genes to protect rice ( Oryza sativa L.) from drought. Front Microbiol 2024; 15:1430546. [PMID: 39234545 PMCID: PMC11371581 DOI: 10.3389/fmicb.2024.1430546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2024] [Accepted: 08/08/2024] [Indexed: 09/06/2024] Open
Abstract
Global climate change poses a significant threat to plant growth and crop yield and is exacerbated by environmental factors, such as drought, salinity, greenhouse gasses, and extreme temperatures. Plant growth-promoting rhizobacteria (PGPR) help plants withstand drought. However, the mechanisms underlying PGPR-plant interactions remain unclear. Thus, this study aimed to isolate PGPR, Bacillus megaterium strains CACC109 and CACC119, from a ginseng field and investigate the mechanisms underlying PGPR-stimulated tolerance to drought stress by evaluating their plant growth-promoting activities and effects on rice growth and stress tolerance through in vitro assays, pot experiments, and physiological and molecular analyses. Compared with B. megaterium type strain ATCC14581, CACC109 and CACC119 exhibited higher survival rates under osmotic stress, indicating their potential to enhance drought tolerance. Additionally, CACC109 and CACC119 strains exhibited various plant growth-promoting activities, including phosphate solubilization, nitrogen fixation, indole-3-acetic acid production, siderophore secretion, 1-aminocyclopropane-1-carboxylate deaminase activity, and exopolysaccharide production. After inoculation, CACC109 and CACC119 significantly improved the seed germination of rice (Oryza sativa L.) under osmotic stress and promoted root growth under stressed and non-stressed conditions. They also facilitated plant growth in pot experiments, as evidenced by increased shoot and root lengths, weights, and leaf widths. Furthermore, CACC109 and CACC119 improved plant physiological characteristics, such as chlorophyll levels, and production of osmolytes, such as proline. In particular, CACC109- and CACC119-treated rice plants showed better drought tolerance, as evidenced by their higher survival rates, greater chlorophyll contents, and lower water loss rates, compared with mock-treated rice plants. Application of CACC109 and CACC119 upregulated the expression of antioxidant-related genes (e.g., OsCAT, OsPOD, OsAPX, and OsSOD) and drought-responsive genes (e.g., OsWRKY47, OsZIP23, OsDREB2, OsNAC066, OsAREB1, and OsAREB2). In conclusion, CACC109 and CACC119 are promising biostimulants for enhancing plant growth and conferring resistance to abiotic stresses in crop production. Future studies should conduct field trials to validate these findings under real agricultural conditions, optimize inoculation methods for practical use, and further investigate the biochemical and physiological responses underlying the observed benefits.
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Affiliation(s)
- Sanghun Lee
- Department of Research and Development, Center for Industrialization of Agricultural and Livestock Microorganisms, Jeongeup-si, Republic of Korea
| | - Jung-Ae Kim
- Department of Research and Development, Center for Industrialization of Agricultural and Livestock Microorganisms, Jeongeup-si, Republic of Korea
| | - Jeongsup Song
- Department of Research and Development, Center for Industrialization of Agricultural and Livestock Microorganisms, Jeongeup-si, Republic of Korea
| | - Seonbong Choe
- Department of Research and Development, Center for Industrialization of Agricultural and Livestock Microorganisms, Jeongeup-si, Republic of Korea
| | - Geupil Jang
- School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea
| | - Yangseon Kim
- Department of Research and Development, Center for Industrialization of Agricultural and Livestock Microorganisms, Jeongeup-si, Republic of Korea
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Fanai A, Bohia B, Lalremruati F, Lalhriatpuii N, Lalrokimi, Lalmuanpuii R, Singh PK, Zothanpuia. Plant growth promoting bacteria (PGPB)-induced plant adaptations to stresses: an updated review. PeerJ 2024; 12:e17882. [PMID: 39184384 PMCID: PMC11344539 DOI: 10.7717/peerj.17882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2024] [Accepted: 07/17/2024] [Indexed: 08/27/2024] Open
Abstract
Plants and bacteria are co-evolving and interact with one another in a continuous process. This interaction enables the plant to assimilate the nutrients and acquire protection with the help of beneficial bacteria known as plant growth-promoting bacteria (PGPB). These beneficial bacteria naturally produce bioactive compounds that can assist plants' stress tolerance. Moreover, they employ various direct and indirect processes to induce plant growth and protect plants against pathogens. The direct mechanisms involve phytohormone production, phosphate solubilization, zinc solubilization, potassium solubilization, ammonia production, and nitrogen fixation while, the production of siderophores, lytic enzymes, hydrogen cyanide, and antibiotics are included under indirect mechanisms. This property can be exploited to prepare bioformulants for biofertilizers, biopesticides, and biofungicides, which are convenient alternatives for chemical-based products to achieve sustainable agricultural practices. However, the application and importance of PGPB in sustainable agriculture are still debatable despite its immense diversity and plant growth-supporting activities. Moreover, the performance of PGPB varies greatly and is dictated by the environmental factors affecting plant growth and development. This review emphasizes the role of PGPB in plant growth-promoting activities (stress tolerance, production of bioactive compounds and phytohormones) and summarises new formulations and opportunities.
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Affiliation(s)
- Awmpuizeli Fanai
- Department of Biotechnology, Mizoram University, Aizawl, Mizoram, India
| | | | | | - Nancy Lalhriatpuii
- Department of Biotechnology/Life Sciences, Pachhunga University College, Aizawl, Mizoram, India
| | - Lalrokimi
- Department of Biotechnology, Mizoram University, Aizawl, Mizoram, India
| | | | - Prashant Kumar Singh
- Department of Biotechnology/Life Sciences, Pachhunga University College, Aizawl, Mizoram, India
| | - Zothanpuia
- Department of Biotechnology/Life Sciences, Pachhunga University College, Aizawl, Mizoram, India
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Shahid M, Singh UB. Enhancing spinach (Spinacia oleracea L.) resilience in pesticide-contaminated soil: Role of pesticide-tolerant Ciceribacter azotifigens and Serratia marcescens in root architecture, leaf gas exchange attributes and antioxidant response restoration. CHEMOSPHERE 2024; 361:142487. [PMID: 38821129 DOI: 10.1016/j.chemosphere.2024.142487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 05/15/2024] [Accepted: 05/29/2024] [Indexed: 06/02/2024]
Abstract
This study unveils the detoxification potential of insecticide-tolerant plant beneficial bacteria (PBB), i.e., Ciceribacter azotifigens SF1 and Serratia marcescens SRB1, in spinach treated with fipronil (FIP), profenofos (PF) and chlorantraniliprole (CLP) insecticides. Increasing insecticide doses (25-400 μg kg-1 soil) significantly curtailed germination attributes and growth of spinach cultivated at both bench-scale and in greenhouse experiments. Profenofos at 400 μg kg-1 exhibited maximum inhibitory effects and reduced germination by 55%; root and shoot length by 78% and 81%, respectively; dry matter accumulation in roots and shoots by 79% and 62%, respectively; leaf number by 87% and leaf area by 56%. Insecticide application caused morphological distortion in root tips/surfaces, increased levels of oxidative stress, and cell death in spinach. Application of insecticide-tolerant SF1 and SRB1 strains relieved insecticide pressure resulting in overall improvement in growth and physiology of spinach grown under insecticide stress. Ciceribacter azotifigens improved germination rate (10%); root biomass (53%); shoot biomass (25%); leaf area (10%); Chl-a (45%), Chl-b (36%) and carotenoid (48%) contents of spinach at 25 μg CLP kg-1 soil. PBB inoculation reinvigorated the stressed spinach and modulated the synthesis of phytochemicals, proline, malondialdehyde (MDA), superoxide anions (O2•-), and hydrogen peroxide (H2O2). Scanning electron microscopy (SEM) revealed recovery in root tip morphology and stomatal openings on abaxial leaf surfaces of PBB-inoculated spinach grown with insecticides. Ciceribacter azotifigens inoculation significantly increased intrinsic water use efficiency, transpiration rate, vapor pressure deficit, intracellular CO2 concentration, photosynthetic rate, and stomatal conductance in spinach exposed to 25 μg FIP kg-1. Also, C. azotifigens and S. marcescens modulated the antioxidant defense systems of insecticide-treated spinach. Bacterial strains were strongly colonized to root surfaces of insecticide-stressed spinach seedlings as revealed under SEM. The identification of insecticide-tolerant PBBs such as C. azotifigens and S. marcescens hold the potential for alleviating abiotic stress to spinach, thereby fostering enhanced and safe production within polluted agroecosystems.
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Affiliation(s)
- Mohammad Shahid
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-NBAIM, Kushmaur, Mau, U.P, India.
| | - Udai B Singh
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-NBAIM, Kushmaur, Mau, U.P, India
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Ananev AA, Ogneva ZV, Nityagovsky NN, Suprun AR, Kiselev KV, Aleynova OA. Whole Genome Sequencing of Bacillus velezensis AMR25, an Effective Antagonist Strain against Plant Pathogens. Microorganisms 2024; 12:1533. [PMID: 39203375 PMCID: PMC11356610 DOI: 10.3390/microorganisms12081533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2024] [Revised: 07/22/2024] [Accepted: 07/23/2024] [Indexed: 09/03/2024] Open
Abstract
The most serious problems for cultivated grapes are pathogenic microorganisms, which reduce the yield and quality of fruit. One of the most widespread disease of grapes is "gray mold", caused by the fungus Botrytis cinerea. Some strains of Bacillus, such as Bacillus halotolerans, Bacillus amyloliquefaciens, and Bacillus velezensis, are known to be active against major post-harvest plant rots. In this study, we showed that the endophytic bacteria B. velezensis strain AMR25 isolated from the leaves of wild grapes Vitis amurensis Rupr. exhibited antimicrobial activity against grape pathogens, including B. cinerea. The genome of B. velezensis AMR25 has one circular chromosome with a length of 3,909,646 bp. with 3689 open reading frames. Genomic analysis identified ten gene clusters involved in the nonribosomal synthesis of polyketides (macrolactin, bacillene, and difficidin), lipopeptides (surfactin, fengycin, and bacillizin), and bacteriocins (difficidin). Also, the genome under study contains a number of genes involved in root colonization, biofilm formation, and biosynthesis of phytohormones. Thus, the endophytic bacteria B. velezensis strain AMR25 shows great promise in developing innovative biological products for enhancing plant resistance against various pathogens.
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Affiliation(s)
| | - Zlata V. Ogneva
- Laboratory of Biotechnology, Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia; (A.A.A.); (N.N.N.); (A.R.S.); (K.V.K.); (O.A.A.)
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Ma L, Wang D, Zhang L, Ge Y, Liu Y, Cheng Y, Jiang X. Green manure application improves insect resistance of subsequent crops through the optimization of soil nutrients and rhizosphere microbiota. iScience 2024; 27:110320. [PMID: 39055949 PMCID: PMC11269313 DOI: 10.1016/j.isci.2024.110320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 05/05/2024] [Accepted: 06/18/2024] [Indexed: 07/28/2024] Open
Abstract
Green manure (GM) enhances organic agriculture by improving soil quality and microbiota, yet its effects on plant resistance are unclear. Investigating the GM crop hairy vetch-maize rotation system, a widely adopted GM practice in China, we aimed to determine maize resistance to fall armyworm (FAW), Spodoptera frugiperda (Smith), a major pest. Greenhouse experiments with three fertilization treatments (chemical fertilizer, GM, and a combination) revealed that GM applications significantly improved maize resistance to FAW, evidenced by reduced larval feeding preference and pupal weight. GM also enriched soil nutrients, beneficial rhizobacteria, and resistance-related compounds, such as salicylic acid, jasmonic acid, and 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA), in maize. The results suggest that GM-amended soils and microbial communities may have an underestimated role in regulating host plant adaptation to pests by increasing plant resistance. This study can provide information for developing and implementing environmentally friendly and sustainable cropping systems with enhanced resistance to pests and diseases.
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Affiliation(s)
- Lin Ma
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Daotong Wang
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Lei Zhang
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Yue Ge
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- School of Landscape Architecture, Beijing University of Agriculture, Beijing 102206, China
| | - Yueqiu Liu
- School of Landscape Architecture, Beijing University of Agriculture, Beijing 102206, China
| | - Yunxia Cheng
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Xingfu Jiang
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
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Sandor R, Wagh SG, Kelterborn S, Großkinsky DK, Novak O, Olsen N, Paul B, Petřík I, Wu S, Hegemann P, Strnad M, Červený J, Roitsch T. Cytokinin-deficient Chlamydomonas reinhardtii CRISPR-Cas9 mutants show reduced ability to prime resistance of tobacco against bacterial infection. PHYSIOLOGIA PLANTARUM 2024; 176:e14311. [PMID: 38715208 DOI: 10.1111/ppl.14311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 04/09/2024] [Accepted: 04/11/2024] [Indexed: 05/12/2024]
Abstract
Although microalgae have only recently been recognized as part of the plant and soil microbiome, their application as biofertilizers has a tradition in sustainable crop production. Under consideration of their ability to produce the plant growth-stimulating hormone cytokinin (CK), known to also induce pathogen resistance, we have assessed the biocontrol ability of CK-producing microalgae. All pro- and eukaryotic CK-producing microalgae tested were able to enhance the tolerance of tobacco against Pseudomonas syringae pv. tabaci (PsT) infection. Since Chlamydomonas reinhardtii (Cre) proved to be the most efficient, we functionally characterized its biocontrol ability. We employed the CRISPR-Cas9 system to generate the first knockouts of CK biosynthetic genes in microalgae. Specifically, we targeted Cre Lonely Guy (LOG) and isopentenyltransferase (IPT) genes, the key genes of CK biosynthesis. While Cre wild-type exhibits a strong protection, the CK-deficient mutants have a reduced ability to induce plant defence. The degree of protection correlates with the CK levels, with the IPT mutants showing less protection than the LOG mutants. Gene expression analyses showed that Cre strongly stimulates tobacco resistance through defence gene priming. This study functionally verifies that Cre primes defence responses with CK, which contributes to the robustness of the effect. This work contributes to elucidate microalgae-mediated plant defence priming and identifies the role of CKs. In addition, these results underscore the potential of CK-producing microalgae as biologicals in agriculture by combining biofertilizer and biocontrol ability for sustainable and environment-friendly crop management.
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Affiliation(s)
- Roman Sandor
- Global Change Research Institute of the Czech Academy of Sciences, Brno, Czech Republic
| | - Sopan Ganpatrao Wagh
- Global Change Research Institute of the Czech Academy of Sciences, Brno, Czech Republic
| | - Simon Kelterborn
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute for translational physiology, Berlin, Germany
| | - Dominik K Großkinsky
- Department of Plant and Environmental Sciences, University of Copenhagen, Taastrup, Denmark
- AIT Austrian Institute of Technology, Center for Health and Bioresources, Bioresources Unit, Tulln a. d. Donau, Austria
| | - Ondrej Novak
- Palacký University & Institute of Experimental Botany of the Czech Academy of Sciences, Olomouc, Czech Republic
| | - Niels Olsen
- Department of Plant and Environmental Sciences, University of Copenhagen, Taastrup, Denmark
| | - Bichitra Paul
- Department of Plant and Environmental Sciences, University of Copenhagen, Taastrup, Denmark
| | - Ivan Petřík
- Palacký University & Institute of Experimental Botany of the Czech Academy of Sciences, Olomouc, Czech Republic
| | - Shujie Wu
- Department of Plant and Environmental Sciences, University of Copenhagen, Taastrup, Denmark
| | - Peter Hegemann
- Humboldt Universität zu Berlin, Institute of Biology, Experimental Biophysics, Berlin, Germany
| | - Miroslav Strnad
- Palacký University & Institute of Experimental Botany of the Czech Academy of Sciences, Olomouc, Czech Republic
| | - Jan Červený
- Global Change Research Institute of the Czech Academy of Sciences, Brno, Czech Republic
| | - Thomas Roitsch
- Global Change Research Institute of the Czech Academy of Sciences, Brno, Czech Republic
- Department of Plant and Environmental Sciences, University of Copenhagen, Taastrup, Denmark
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Kwon EH, Adhikari A, Imran M, Hussain A, Gam HJ, Woo JI, Jeon JR, Lee DS, Lee CY, Lay L, Kang SM, Kim WC, Yun BW, Lee IJ. Novel melatonin-producing Bacillus safensis EH143 mitigates salt and cadmium stress in soybean. J Pineal Res 2024; 76:e12957. [PMID: 38803089 DOI: 10.1111/jpi.12957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 04/02/2024] [Accepted: 04/18/2024] [Indexed: 05/29/2024]
Abstract
Recently, microorganism and exogenous melatonin application has been recognized as an efficient biological tool for enhancing salt tolerance and heavy metal detoxification in agriculture crops. Thus, the goal of this study was to isolate and evaluate a novel melatonin-producing plant growth promoting bacterium. With high-throughput whole genome sequencing, phytohormone measurements, expression profiling, and biochemical analysis, we can identify a novel PGPB that produces melatonin and unravel how it promotes soybean growth and development and protects against salt and Cd stress. We identify the melatonin synthesis pathway (tryptophan→tryptamine→serotonin melatonin) of the halotolerant (NaCl > 800 mM) and heavy metal-resistant (Cd >3 mM) rhizobacterium Bacillus safensis EH143 and use it to treat soybean plants subjected to Cd and NaCl stresses. Results show that EH143 will highly bioaccumulate heavy metals and significantly improve P and Ca2+ uptake and the K+/Na+ (93%↑under salt stress) ratio while reducing Cd uptake (49% under Cd stress) in shoots. This activity was supported by the expression of the ion regulator HKT1, MYPB67, and the calcium sensors CDPK5 and CaMK1 which ultimately led to increased plant growth. EH143 significantly decreased ABA content in shoots by 13%, 20%, and 34% and increased SA biosynthesis in shoots by 14.8%, 31%, and 48.2% in control, salt, and Cd-treated plants, upregulating CYP707A1 and CYP707A2 and PAL1 and ICS, respectively. The melatonin content significantly decreased along with a reduced expression of ASMT3 following treatment with EH143; moreover, reduced expression of peroxidase (POD) and superoxide dismutase (SOD) by 134.5% and 39% under salt+Cd stress, respectively and increased level of total amino acids were observed. Whole-genome sequencing and annotation of EH143 revealed the presence of the melatonin precursor tryptophan synthase (trpA, trpB, trpS), metal and other ion regulators (Cd: cadA, potassium: KtrA and KtrB, phosphate: glpT, calcium: yloB, the sodium/glucose cotransporter: sgIT, and the magnesium transporter: mgtE), and enzyme activators (including the siderophore transport proteins yfiZ and yfhA, the SOD sodA, the catalase katA1, and the glutathione regulator KefG) that may be involved in programming the plant metabolic system. As a consequence, EH143 treatment significantly reduced the contents of lipid peroxidation (O2-, MDA, and H2O2) up to 69%, 46%, and 29% in plants under salt+Cd stress, respectively. These findings suggest that EH143 could be a potent biofertilizer to alleviate NaCl and Cd toxicity in crops and serve as an alternative substitute for exogenous melatonin application.
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Affiliation(s)
- Eun-Hae Kwon
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Arjun Adhikari
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Muhammad Imran
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
- Biosafety Division, National Institute of Agriculture Science, Rural Development Administration, Jeonju, South Korea
| | - Adil Hussain
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
- Department of Agriculture, Abdul Wali Khan University Mardan, Khyber Pakhtunkhwa, Pakistan
| | - Ho-Jun Gam
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Ji-In Woo
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Jin Ryeol Jeon
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Da-Sol Lee
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Chung-Yeol Lee
- Department of Statistics Graduate School, Kyungpook National University, Daegu, Republic of Korea
| | - Liny Lay
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Sang-Mo Kang
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Won-Chan Kim
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Byung-Wook Yun
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - In-Jung Lee
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
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Sena L, Mica E, Valè G, Vaccino P, Pecchioni N. Exploring the potential of endophyte-plant interactions for improving crop sustainable yields in a changing climate. FRONTIERS IN PLANT SCIENCE 2024; 15:1349401. [PMID: 38571718 PMCID: PMC10988515 DOI: 10.3389/fpls.2024.1349401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Accepted: 03/05/2024] [Indexed: 04/05/2024]
Abstract
Climate change poses a major threat to global food security, significantly reducing crop yields as cause of abiotic stresses, and for boosting the spread of new and old pathogens and pests. Sustainable crop management as a route to mitigation poses the challenge of recruiting an array of solutions and tools for the new aims. Among these, the deployment of positive interactions between the micro-biotic components of agroecosystems and plants can play a highly significant role, as part of the agro-ecological revolution. Endophytic microorganisms have emerged as a promising solution to tackle this challenge. Among these, Arbuscular Mycorrhizal Fungi (AMF) and endophytic bacteria and fungi have demonstrated their potential to alleviate abiotic stresses such as drought and heat stress, as well as the impacts of biotic stresses. They can enhance crop yields in a sustainable way also by other mechanisms, such as improving the nutrient uptake, or by direct effects on plant physiology. In this review we summarize and update on the main types of endophytes, we highlight several studies that demonstrate their efficacy in improving sustainable yields and explore possible avenues for implementing crop-microbiota interactions. The mechanisms underlying these interactions are highly complex and require a comprehensive understanding. For this reason, omic technologies such as genomics, transcriptomics, proteomics, and metabolomics have been employed to unravel, by a higher level of information, the complex network of interactions between plants and microorganisms. Therefore, we also discuss the various omic approaches and techniques that have been used so far to study plant-endophyte interactions.
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Affiliation(s)
- Lorenzo Sena
- Dipartimento di Scienze della Vita, Sede Agraria, UNIMORE - Università di Modena e Reggio Emilia, Reggio Emilia, Italy
- Centro di Ricerca Cerealicoltura e Colture Industriali, CREA – Consiglio per la Ricerca in Agricoltura e l’Analisi dell’Economia Agraria, Vercelli, Italy
| | - Erica Mica
- Dipartimento per lo Sviluppo Sostenibile e la Transizione Ecologica, UPO – Università del Piemonte Orientale, Complesso San Giuseppe, Vercelli, Italy
| | - Giampiero Valè
- Dipartimento per lo Sviluppo Sostenibile e la Transizione Ecologica, UPO – Università del Piemonte Orientale, Complesso San Giuseppe, Vercelli, Italy
| | - Patrizia Vaccino
- Centro di Ricerca Cerealicoltura e Colture Industriali, CREA – Consiglio per la Ricerca in Agricoltura e l’Analisi dell’Economia Agraria, Vercelli, Italy
| | - Nicola Pecchioni
- Dipartimento di Scienze della Vita, Sede Agraria, UNIMORE - Università di Modena e Reggio Emilia, Reggio Emilia, Italy
- Centro di Ricerca Cerealicoltura e Colture Industriali, CREA – Consiglio per la Ricerca in Agricoltura e l’Analisi dell’Economia Agraria, Vercelli, Italy
- Centro di Ricerca Cerealicoltura e Colture Industriali, CREA – Consiglio per la Ricerca in Agricoltura e l’Analisi dell’Economia Agraria, Foggia, Italy
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Kang W, Duan Y, Lei P. Transcriptomic changes in soybean underlying growth promotion and defense against cyst nematode after Bacillus simplex Sneb545 treatment. Gene 2024; 898:148080. [PMID: 38101712 DOI: 10.1016/j.gene.2023.148080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 11/11/2023] [Accepted: 12/12/2023] [Indexed: 12/17/2023]
Abstract
Bacillus simplex Sneb45 is a plant-growth-promoting rhizobacterium that promotes soybean growth and systemic resistance to cyst nematode. To investigate transcriptional changes in soybean roots in response to B. simplex Sneb45 treatment, transcriptome analysis and quantitative real-time PCR were conducted to detect and validate the differentially expressed genes (DEGs). In total, 19,109 DEGs were obtained. After B. simplex Sneb545 treatment, 970 and 1265 genes were up- and down-regulated at 5 days post-inoculation (dpi), respectively, and 142 and 47 genes were up- and down-regulated at 10 dpi, respectively, compared with untreated soybean roots. Functional annotation of DEGs indicated that B. simplex Sneb545 regulated soybean growth and defense against cyst nematode possibly through genes related to auxin, gibberellin, and NB-LRR protein. In addition, GO and KEGG enrichment analyses indicated that the DEGs were enriched in metabolism, signal transduction, and plant-pathogen interaction pathways. Moreover, the auxin and gibberellin contents were lower in B. simplex Sneb545-treated soybean roots than in untreated roots at 5 dpi. B. simplex Sneb545 possibly altered the expression of wound-induced protein and NAC transcription factor to regulate soybean growth and defense against cyst nematode. Our study provided deep insights into the alterations in soybean transcriptome after exposure to B. simplex Sneb45 and a theoretical basis for further exploring molecular functions underlying the biological control activity of B. simplex Sneb545.
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Affiliation(s)
- Wenshu Kang
- College of Environment, Shenyang University, Shenyang 110044, PR China
| | - Yuxi Duan
- College of plant protection, Shenyang Agricultural University, Shenyang 110866, PR China
| | - Piao Lei
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, PR China.
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11
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Duan M, Li X, Wu X, Long S, Huang H, Li Y, Liu QH, Zhu G, Feng B, Qin S, Li C, Yang H, Qin J, Chen Z, Wang Z. Dictyophora indusiata and Bacillus aryabhattai improve sugarcane yield by endogenously associating with the root and regulating flavonoid metabolism. FRONTIERS IN PLANT SCIENCE 2024; 15:1326917. [PMID: 38516657 PMCID: PMC10955060 DOI: 10.3389/fpls.2024.1326917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 02/21/2024] [Indexed: 03/23/2024]
Abstract
Introduction Endophytes play a significant role in regulating plant root development and facilitating nutrient solubilization and transportation. This association could improve plant growth. The present study has uncovered a distinct phenotype, which we refer to as "white root", arising from the intricate interactions between endophytic fungi and bacteria with the roots in a sugarcane and bamboo fungus (Dictyophora indusiata) intercropping system. Methods We investigated the mechanisms underlying the formation of this "white root" phenotype and its impact on sugarcane yield and metabolism by metabarcoding and metabolome analysis. Results and Discussion Initial analysis revealed that intercropping with D. indusiata increased sugarcane yield by enhancing the number of viable tillers compared with bagasse and no input control. Metabarcoding based on second-generation and third-generation sequencing indicated that D. indusiate and Bacillus aryabhattai dominates the fungal and bacterial composition in the "white root" phenotype of sugarcane root. The coexistence of D. indusiata and B. aryabhattai as endophytes induced plant growth-promoting metabolites in the sugarcane root system, such as lysoPC 18:1 and dihydrobenzofuran, probably contributing to increased sugarcane yield. Furthermore, the association also enhanced the metabolism of compounds, such as naringenin-7-O-glucoside (Prunin), naringenin-7-O-neohesperidoside (Naringin)*, hesperetin-7-O-neohesperidoside (Neohesperidin), epicatechin, and aromadendrin (Dihydrokaempferol), involved in flavonoid metabolism during the formation of the endophytic phenotype in the sugarcane root system. These observations suggest that the "white root" phenotype promotes sugarcane growth by activating flavonoid metabolism. This study reports an interesting phenomenon where D. indusiata, coordinate with the specific bacteria invade, forms a "white root" phenotype with sugarcane root. The study also provides new insights into using D. indusiata as a soil inoculant for promoting sugarcane growth and proposes a new approach for improve sugarcane cultivation.
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Affiliation(s)
- Mingzheng Duan
- Guangxi Academy of Agricultural Sciences, Nanning, China
- Yunnan Key Laboratory of Gastrodia Elata and Fungal Symbiotic Biology, College of Agronomy and Life Sciences, Zhaotong University, Zhaotong, China
| | - Xiang Li
- Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Xiaojian Wu
- Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Shengfeng Long
- Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Hairong Huang
- Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Yijie Li
- Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Qi-Huai Liu
- Laibin Academy of Agricultural Sciences, Laibin, China
| | - Guanghu Zhu
- Laibin Academy of Agricultural Sciences, Laibin, China
| | - Bin Feng
- Laibin Academy of Agricultural Sciences, Laibin, China
| | - Sunqian Qin
- Laibin Academy of Agricultural Sciences, Laibin, China
| | - Changning Li
- Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Hai Yang
- Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Jie Qin
- Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Zhendong Chen
- Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Zeping Wang
- Guangxi Academy of Agricultural Sciences, Nanning, China
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12
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Li J, Zhang L, Yu S, Luo Z, Su D, Zheng D, Zhou H, Zhu J, Lin X, Luo H, Rensing C, Lin Z, Lin D. Long-Term Benefits of Cenchrus fungigraminus Residual Roots Improved the Quality and Microbial Diversity of Rhizosphere Sandy Soil through Cellulose Degradation in the Ulan Buh Desert, Northwest China. PLANTS (BASEL, SWITZERLAND) 2024; 13:708. [PMID: 38475554 DOI: 10.3390/plants13050708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Revised: 02/22/2024] [Accepted: 02/26/2024] [Indexed: 03/14/2024]
Abstract
Long-term plant residue retention can effectively replenish soil quality and fertility. In this study, we collected rhizosphere soil from the residual roots of annual Cenchrus fungigraminus in the Ulan Buh Desert over the past 10 years. The area, depth, and length of these roots decreased over time. The cellulose content of the residual roots was significantly higher in the later 5 years (2018-2022) than the former 5 years (2013-2017), reaching its highest value in 2021. The lignin content of the residual roots did not differ across samples except in 2015 and reached its highest level in 2021. The total sugar of the residual roots in 2022 was 227.88 ± 30.69 mg·g-1, which was significantly higher than that in other years. Compared to the original sandy soil, the soil organic matter and soil microbial biomass carbon (SMBC) contents were 2.17-2.41 times and 31.52-35.58% higher in the later 3 years (2020-2022) and reached the highest values in 2020. The residual roots also significantly enhanced the soil carbon stocks from 2018-2022. Soil dehydrogenase, nitrogenase, and N-acetyl-β-D-glucosidase (S-NAG) were significantly affected from 2019-2022. The rhizosphere soil community richness and diversity of the bacterial and fungal communities significantly decreased with the duration of the residual roots in the sandy soil, and there was a significant difference for 10 years. Streptomyces, Bacillus, and Sphigomonas were the representative bacteria in the residual root rhizosphere soil, while Agaricales and Panaeolus were the enriched fungal genera. The distance-based redundancy analysis and partial least square path model results showed that the duration of residual roots in the sandy soil, S-NAG, and SMBC were the primary environmental characteristics that shaped the microbial community. These insights provide new ideas on how to foster the exploration of the use of annual herbaceous plants for sandy soil improvement in the future.
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Affiliation(s)
- Jing Li
- National Engineering Research Center of Juncao Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- College of Juncao and Ecology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Lili Zhang
- National Engineering Research Center of Juncao Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- College of Juncao and Ecology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Shikui Yu
- National Engineering Research Center of Juncao Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Zongzhi Luo
- National Engineering Research Center of Juncao Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Dewei Su
- National Engineering Research Center of Juncao Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Dan Zheng
- National Engineering Research Center of Juncao Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Hengyu Zhou
- National Engineering Research Center of Juncao Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- College of Juncao and Ecology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Jieyi Zhu
- National Engineering Research Center of Juncao Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- College of Life Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Xingsheng Lin
- National Engineering Research Center of Juncao Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- College of Juncao and Ecology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Hailing Luo
- National Engineering Research Center of Juncao Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- College of Juncao and Ecology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Christopher Rensing
- National Engineering Research Center of Juncao Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- Institute of Environmental Microbiology, College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Zhanxi Lin
- National Engineering Research Center of Juncao Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- College of Juncao and Ecology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Dongmei Lin
- National Engineering Research Center of Juncao Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- College of Juncao and Ecology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
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13
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Kalleku JN, Ihsan S, Al-Azzawi TNI, Khan M, Hussain A, Chebitok F, Das AK, Moon YS, Mun BG, Lee IJ, Ali S, Yun BW. Halotolerant Pseudomonas koreensis S4T10 mitigate salt and drought stress in Arabidopsis thaliana. PHYSIOLOGIA PLANTARUM 2024; 176:e14258. [PMID: 38522952 DOI: 10.1111/ppl.14258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 02/18/2024] [Accepted: 03/02/2024] [Indexed: 03/26/2024]
Abstract
Salt and drought are documented among the most detrimental and persistent abiotic stresses for crop production. Here, we investigated the impact of Pseudomonas koreensis strain S4T10 on plant performance under salt and drought stress. Arabidopsis thaliana Col-0 wild type and atnced3 mutant plants were inoculated with P. koreensis or tap water and exposed to NaCl (100 mM) for five days and drought stress by withholding water for seven days. P. koreensis significantly enhanced plant biomass and photosynthetic pigments under salt and drought stress conditions. Moreover, P. koreensis activated the antioxidant defence by modulating glutathione (GSH), superoxide dismutase (SOD), peroxidase (POD), and polyphenol oxidase (PPO) activities to scavenge the reactive oxygen species produced due to the stress. In addition, the application of P. koreensis upregulated the expression of genes associated with antioxidant responses, such as AtCAT1, AtCAT3, and AtSOD. Similarly, genes linked to salt stress, such as AtSOS1, AtSOS2, AtSOS3, AtNHX1, and AtHKT1, were also upregulated, affirming the positive role of P. koreensis S4T10 in streamlining the cellular influx and efflux transport systems during salt stress. Likewise, the PGPB inoculation was observed to regulate the expression of drought-responsive genes AtDREB2A, AtDREB2B, and ABA-responsive genes AtAO3, AtABA3 indicating that S4T10 enhanced drought tolerance via modulation of the ABA pathway. The results of this study affirm that P. koreensis S4T10 could be further developed as a biofertilizer to mitigate salt and drought stress at the same time.
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Affiliation(s)
- Justine Nathanael Kalleku
- Department of Food Security and Agricultural Development, Kyungpook National University, Republic of Korea
- Institute of International Research and Development, Kyungpook National University, Republic of Korea
| | - Samsoor Ihsan
- Department of Food Security and Agricultural Development, Kyungpook National University, Republic of Korea
- Institute of International Research and Development, Kyungpook National University, Republic of Korea
| | - Tiba Nazar Ibrahim Al-Azzawi
- Department of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Republic of Korea
| | - Murtaza Khan
- Department of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Republic of Korea
| | - Adil Hussain
- Department of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Republic of Korea
- Department of Agriculture, Abdul Wali Khan University Mardan, Khyber Pakhtunkhwa, Pakistan
| | - Felistus Chebitok
- Department of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Republic of Korea
| | - Ashim Kumar Das
- Department of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Republic of Korea
| | - Yong-Sun Moon
- Department of Horticulture and Life Science, Yeungnam University, Republic of Korea
| | - Bong-Gyu Mun
- Department of Environmental and Biological Chemistry, Chungbuk National University, Cheongju, Republic of Korea
| | - In-Jung Lee
- Department of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Republic of Korea
| | - Sajid Ali
- Department of Horticulture and Life Science, Yeungnam University, Republic of Korea
| | - Byung-Wook Yun
- Department of Food Security and Agricultural Development, Kyungpook National University, Republic of Korea
- Institute of International Research and Development, Kyungpook National University, Republic of Korea
- Department of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Republic of Korea
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14
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Mun BG, Hussain A, Park YG, Kang SM, Lee IJ, Yun BW. The PGPR Bacillus aryabhattai promotes soybean growth via nutrient and chlorophyll maintenance and the production of butanoic acid. FRONTIERS IN PLANT SCIENCE 2024; 15:1341993. [PMID: 38439982 PMCID: PMC10909845 DOI: 10.3389/fpls.2024.1341993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Accepted: 01/31/2024] [Indexed: 03/06/2024]
Abstract
Plant growth-promoting rhizobacteria (PGPR) colonize plant roots, establish a mutualistic relationship with the plants and help them grow better. This study reports novel findings on the plant growth-promoting effects of the PGPR Bacillus aryabhattai. Soil was collected from a soybean field, PGPR were isolated, identified, and characterized for their ability to promote plant growth and development. The bacterium was isolated from the soybean rhizosphere and identified as B. aryabhattai strain SRB02 via 16s rRNA sequencing. As shown by SEM, the bacterium successfully colonized rice and soybean roots within 2 days and significantly promoted the growth of the GA-deficient rice cultivar Waito-C within 10 days, as well as the growth of soybean plants with at least six times longer shoots, roots, higher chlorophyll content, fresh, and dry weight after 10 days of inoculation. ICP analysis showed up to a 100% increase in the quantity of 18 different amino acids in the SRB02-treated soybean plants. Furthermore, the 2-DE gel assay indicated the presence of several differentially expressed proteins in soybean leaves after 24 hrs of SRB02 application. MALDI-TOF-MS identified β-conglycinin and glycinin along with several other proteins that were traced back to their respective genes. Analysis of bacterial culture filtrates via GCMS recorded significantly higher quantities of butanoic acid which was approximately 42% of all the metabolites found in the filtrates. The application of 100 ppm butanoic acid had significantly positive effects on plant growth via chlorophyll maintenance. These results establish the suitability of B. aryabhattai as a promising PGPR for field application in various crops.
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Affiliation(s)
- Bong-Gyu Mun
- Department of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Daegu, Republic of Korea
- Department of Environmental and Biological Chemistry, Chungbuk National University, Cheongju, Republic of Korea
| | - Adil Hussain
- Department of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Daegu, Republic of Korea
- Department of Agriculture, Abdul Wali Khan University, Mardan, Khyber Pakhtunkhwa, Pakistan
| | - Yeon-Gyeong Park
- Department of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Sang-Mo Kang
- Department of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - In-Jung Lee
- Department of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Byung-Wook Yun
- Department of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Daegu, Republic of Korea
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15
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Sharma V, Mohammed SA, Devi N, Vats G, Tuli HS, Saini AK, Dhir YW, Dhir S, Singh B. Unveiling the dynamic relationship of viruses and/or symbiotic bacteria with plant resilience in abiotic stress. STRESS BIOLOGY 2024; 4:10. [PMID: 38311681 PMCID: PMC10838894 DOI: 10.1007/s44154-023-00126-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Accepted: 10/22/2023] [Indexed: 02/06/2024]
Abstract
In the ecosphere, plants interact with environmental biotic and abiotic partners, where unbalanced interactions can induce unfavourable stress conditions. Abiotic factors (temperature, water, and salt) are primarily required for plants healthy survival, and any change in their availability is reflected as a stress signal. In certain cases, the presence of infectious pathogens such as viruses, bacteria, fungi, protozoa, nematodes, and insects can also create stress conditions in plants, leading to the emergence of disease or deficiency symptoms. While these symptoms are often typical of abiotic or biotic stress, however, there are instances where they can intensify under specific conditions. Here, we primarily summarize the viral interactions with plants during abiotic stress to understand how these associations are linked together during viral pathogenesis. Secondly, focus is given to the beneficial effects of root-associated symbiotic bacteria in fulfilling the basic needs of plants during normal as well as abiotic stress conditions. The modulations of plant functional proteins, and their occurrence/cross-talk, with pathogen (virus) and symbiont (bacteria) molecules are also discussed. Furthermore, we have highlighted the biochemical and systematic adaptations that develop in plants due to bacterial symbiosis to encounter stress hallmarks. Lastly, directions are provided towards exploring potential rhizospheric bacteria to maintain plant-microbes ecosystem and manage abiotic stress in plants to achieve better trait health in the horticulture crops.
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Affiliation(s)
- Vasudha Sharma
- Department of Biosciences & Technology and Central Research Cell, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India
| | - Shakeel A Mohammed
- Department of Biosciences & Technology and Central Research Cell, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India
| | - Nisha Devi
- Department of Biosciences & Technology and Central Research Cell, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India
| | - Gourav Vats
- Department of Biosciences & Technology and Central Research Cell, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India
| | - Hardeep S Tuli
- Department of Biosciences & Technology and Central Research Cell, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India
| | - Adesh K Saini
- Department of Biosciences & Technology and Central Research Cell, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India
| | - Yashika W Dhir
- Department of Biosciences & Technology and Central Research Cell, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India.
| | - Sunny Dhir
- Department of Biosciences & Technology and Central Research Cell, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India.
| | - Bharat Singh
- Department of Biosciences & Technology and Central Research Cell, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India.
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16
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Nivetha N, Asha AD, Krishna GK, Chinnusamy V, Paul S. Rhizobacteria Bacillus spp. mitigate osmotic stress and improve seed germination in mustard by regulating osmolyte and plant hormone signaling. PHYSIOLOGIA PLANTARUM 2024; 176:e14202. [PMID: 38356406 DOI: 10.1111/ppl.14202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 01/11/2024] [Accepted: 01/15/2024] [Indexed: 02/16/2024]
Abstract
Drought, a widespread abiotic stressor, exerts a profound impact on agriculture, impeding germination and plant growth, and reducing crop yields. In the present investigation, the osmotolerant rhizobacteria Bacillus casamancensis strain MKS-6 and Bacillus sp. strain MRD-17 were assessed for their effects on molecular processes involved in mustard germination under osmotic stress conditions. Enhancement in germination was evidenced by improved germination percentages, plumule and radicle lengths, and seedling vigor upon rhizobacterial inoculation under no stress and osmotic stress conditions. Under osmotic stress, rhizobacteria stimulated the production of gibberellins and reserve hydrolytic enzymes (lipases, isocitrate lyase, and malate synthase), bolstering germination. Furthermore, these rhizobacteria influenced the plant hormones such as gibberellins and abscisic acid (ABA), as well as signalling pathways, thereby promoting germination under osmotic stress. Reduced proline and glycine betaine accumulation, and down-regulation of transcription factors BjDREB1_2 and BjDREB2 (linked to ABA-independent signalling) in rhizobacteria-inoculated seedlings indicated that bacterial treatment mitigated water deficit stress during germination, independently of these pathways. Hence, the advantageous attributes exhibited by these rhizobacterial strains can be effectively harnessed to alleviate drought-induced stress in mustard crops, potentially through the development of targeted bio-formulations.
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Affiliation(s)
- Nagarajan Nivetha
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
- Research and Development Division, Sea6 Energy Pvt Ltd., C-CAMP, NCBS-TIFR, Bangalore, India
| | - Arambam Devi Asha
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Gopinathan Kumar Krishna
- Department of Plant Physiology, College of Agriculture, KAU, Thrissur, India
- Division of Plant Physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Viswanathan Chinnusamy
- Division of Plant Physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Sangeeta Paul
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
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17
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Lastochkina O, Yuldashev R, Avalbaev A, Allagulova C, Veselova S. The Contribution of Hormonal Changes to the Protective Effect of Endophytic Bacterium Bacillus subtilis on Two Wheat Genotypes with Contrasting Drought Sensitivities under Osmotic Stress. Microorganisms 2023; 11:2955. [PMID: 38138099 PMCID: PMC10745732 DOI: 10.3390/microorganisms11122955] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 11/29/2023] [Accepted: 12/07/2023] [Indexed: 12/24/2023] Open
Abstract
A comparative analysis was conducted to evaluate the effects of seed priming with endophytic bacterium Bacillus subtilis 10-4 (BS) on the hormonal system and cell wall tolerance (lipid peroxidation (LPO), electrolyte leakage (EL), and root lignin deposition) of two Triticum aestivum L. (wheat) varieties with contrasting drought sensitivities (Ekada 70-drought-tolerant (DT); Salavat Yulaev-drought-sensitive (DS)) under normal conditions and 12% polyethylene glycol-6000 (PEG)-induced osmotic stress. The results showed that under normal conditions, the growth stimulation in wheat plants by BS was attributed to changes in the hormonal balance, particularly an increase in endogenous indole-3-acetic acid (IAA) accumulation. However, under stress, a significant hormonal imbalance was observed in wheat seedlings, characterized by a pronounced accumulation of abscisic acid (ABA) and a decrease in the levels of IAA and cytokinins (CK). These effects were reflected in the inhibition of plant growth. BS exhibited a protective effect on stressed plants, as evidenced by a significantly lower amplitude of stress-induced changes in the hormonal system: maintaining the content of IAA at a level close to the control, reducing stress-induced ABA accumulation, and preventing CK depletion. These effects were further reflected in the normalization of growth parameters in dehydrated seedlings, as well as a decrease in leaf chlorophyll degradation, LPO, and EL, along with an increase in lignin deposition in the basal part of the roots in both genotypes. Overall, the findings demonstrate that BS, producing phytohormones, specifically IAA and ABA, had a more pronounced protective effect on DT plants, as evidenced by a smaller amplitude of stress-induced hormonal changes, higher leaf chlorophyll content, root lignin deposition, and lower cell membrane damage (LPO) and permeability (EL) compared to DS plants.
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Affiliation(s)
- Oksana Lastochkina
- Institute of Biochemistry and Genetics—Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, 71 Pr. Oktyabrya, 450054 Ufa, Russia (A.A.); (S.V.)
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18
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Mukhopadhyay M, Mukherjee A, Ganguli S, Chakraborti A, Roy S, Choudhury SS, Subramaniyan V, Kumarasamy V, Sayed AA, El-Demerdash FM, Almutairi MH, Şuţan A, Dhara B, Mitra AK. Marvels of Bacilli in soil amendment for plant-growth promotion toward sustainable development having futuristic socio-economic implications. Front Microbiol 2023; 14:1293302. [PMID: 38156003 PMCID: PMC10752760 DOI: 10.3389/fmicb.2023.1293302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Accepted: 11/14/2023] [Indexed: 12/30/2023] Open
Abstract
Microorganisms are integral components of ecosystems, exerting profound impacts on various facets of human life. The recent United Nations General Assembly (UNGA) Science Summit emphasized the critical importance of comprehending the microbial world to address global challenges, aligning with the United Nations Sustainable Development Goals (SDGs). In agriculture, microbes are pivotal contributors to food production, sustainable energy, and environmental bioremediation. However, decades of agricultural intensification have boosted crop yields at the expense of soil health and microbial diversity, jeopardizing global food security. To address this issue, a study in West Bengal, India, explored the potential of a novel multi-strain consortium of plant growth promoting (PGP) Bacillus spp. for soil bioaugmentation. These strains were sourced from the soil's native microbial flora, offering a sustainable approach. In this work, a composite inoculum of Bacillus zhangzhouensis MMAM, Bacillus cereus MMAM3), and Bacillus subtilis MMAM2 were introduced into an over-exploited agricultural soil and implications on the improvement of vegetative growth and yield related traits of Gylcine max (L) Meril. plants were evaluated, growing them as model plant, in pot trial condition. The study's findings demonstrated significant improvements in plant growth and soil microbial diversity when using the bacterial consortium in conjunction with vermicompost. Metagenomic analyses revealed increased abundance of many functional genera and metabolic pathways in consortium-inoculated soil, indicating enhanced soil biological health. This innovative bioaugmentation strategy to upgrade the over-used agricultural soil through introduction of residual PGP bacterial members as consortia, presents a promising path forward for sustainable agriculture. The rejuvenated patches of over-used land can be used by the small and marginal farmers for cultivation of resilient crops like soybean. Recognizing the significance of multi-strain PGP bacterial consortia as potential bioinoculants, such technology can bolster food security, enhance agricultural productivity, and mitigate the adverse effects of past agricultural activities.
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Affiliation(s)
- Meenakshi Mukhopadhyay
- Department of Botany, Vivekananda College (Affiliated to University of Calcutta), Kolkata, West Bengal, India
| | - Ashutosh Mukherjee
- Department of Botany, Vivekananda College (Affiliated to University of Calcutta), Kolkata, West Bengal, India
| | - Sayak Ganguli
- Department of Biotechnology, St. Xavier’s College (Autonomous), Kolkata, West Bengal, India
| | - Archisman Chakraborti
- Department of Physics, St. Xavier’s College (Autonomous), Kolkata, West Bengal, India
| | - Samrat Roy
- Depatrment of Commerce, St. Xavier’s College (Autonomous), Kolkata, West Bengal, India
| | - Sudeshna Shyam Choudhury
- Post Graduate Department of Microbiology, St. Xavier’s College (Autonomous), Kolkata, West Bengal, India
| | - Vetriselvan Subramaniyan
- Pharmacology Unit, Jeffrey Cheah School of Medicine and Health Sciences, Monash University, Bandar Sunway, Malaysia
- Center for Transdisciplinary Research, Department of Pharmacology, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, Tamil Nadu, India
| | - Vinoth Kumarasamy
- Department of Parasitology and Medical Entomology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Amany A. Sayed
- Zoology Department, Faculty of Science, Cairo University, Giza, Egypt
| | - Fatma M. El-Demerdash
- Department of Environmental Studies, Institute of Graduate Studies and Research, Alexandria University, Alexandria, Egypt
| | - Mikhlid H. Almutairi
- Zoology Department, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Anca Şuţan
- Department of Natural Sciences, Faculty of Science, Physical Education and Informatics, University of Pitești, Pitești, Romania
| | - Bikram Dhara
- Post Graduate Department of Microbiology, St. Xavier’s College (Autonomous), Kolkata, West Bengal, India
- Center for Global Health Research, Saveetha Medical College and Hospital, Saveetha Institute of Medical and Technical Sciences, Chennai, Tamil Nadu, India
| | - Arup Kumar Mitra
- Post Graduate Department of Microbiology, St. Xavier’s College (Autonomous), Kolkata, West Bengal, India
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Soares CRFS, Hernández AG, da Silva EP, de Souza JEA, Bonfim DF, Zabot GL, Ferreira PAA, Brunetto G. Applications and Market of Micro-Organism-Based and Plant-Based Inputs in Brazilian Agriculture. PLANTS (BASEL, SWITZERLAND) 2023; 12:3844. [PMID: 38005741 PMCID: PMC10675046 DOI: 10.3390/plants12223844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 10/22/2023] [Accepted: 10/30/2023] [Indexed: 11/26/2023]
Abstract
The use of plant-based and micro-organism-based biological inputs is a sustainable agricultural practice. It promotes a suitable and better utilization of non-renewable resources in the environment. The benefits of using micro-organisms are associated with direct and indirect mechanisms, mainly related to improvements in the absorption and availability of nutrients, resulting in a consequent impact on plant growth. The main benefits of using biochemical pesticides are the promotion of sustainability and the management of resistance to pests and diseases. Although the use of micro-organisms and botanical metabolites is a promising agricultural alternative, they are still primarily concentrated in grain crops. There is a huge opportunity to expand the plant-based and micro-organism-based biological inputs used in agriculture due to the wide range of mechanisms of action of those products. At a global level, several terminologies have been adopted to characterize biological inputs, but many terms used conflict with Brazilian legislation. This review will clarify the classes of biological inputs existing in Brazil as well as present the application and evolution of the market for microbiological and plant-based inputs.
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Affiliation(s)
- Cláudio Roberto Fonsêca Sousa Soares
- Departamento de Microbiologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Imunologia e Parasitologia, Campus Universitário Reitor João David Ferreira Lima, Trindade, Florianópolis 88040-900, SC, Brazil; (A.G.H.); (E.P.d.S.)
| | - Anabel González Hernández
- Departamento de Microbiologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Imunologia e Parasitologia, Campus Universitário Reitor João David Ferreira Lima, Trindade, Florianópolis 88040-900, SC, Brazil; (A.G.H.); (E.P.d.S.)
| | - Emanuela Pille da Silva
- Departamento de Microbiologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Imunologia e Parasitologia, Campus Universitário Reitor João David Ferreira Lima, Trindade, Florianópolis 88040-900, SC, Brazil; (A.G.H.); (E.P.d.S.)
| | | | - Danyella Fernandes Bonfim
- Agricultural Engineer, SHIN CA 9, Lt 13-15, Ed. Porto do Lago, Lago Norte, Brasília 71503-509, DF, Brazil;
| | - Giovani Leone Zabot
- Coordenação Acadêmica, Universidade Federal de Santa Maria, Campus Cachoeira do Sul, Cachoeira do Sul 96521-000, RS, Brazil; (G.L.Z.); (P.A.A.F.)
| | - Paulo Ademar Avelar Ferreira
- Coordenação Acadêmica, Universidade Federal de Santa Maria, Campus Cachoeira do Sul, Cachoeira do Sul 96521-000, RS, Brazil; (G.L.Z.); (P.A.A.F.)
| | - Gustavo Brunetto
- Departamento de Ciência do Solo, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil;
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20
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Salazar B, Ortiz A, Keswani C, Minkina T, Mandzhieva S, Pratap Singh S, Rekadwad B, Borriss R, Jain A, Singh HB, Sansinenea E. Bacillus spp. as Bio-factories for Antifungal Secondary Metabolites: Innovation Beyond Whole Organism Formulations. MICROBIAL ECOLOGY 2023; 86:1-24. [PMID: 35604432 DOI: 10.1007/s00248-022-02044-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 05/13/2022] [Indexed: 06/15/2023]
Abstract
Several fungi act as parasites for crops causing huge annual crop losses at both pre- and post-harvest stages. For years, chemical fungicides were the solution; however, their wide use has caused environmental contamination and human health problems. For this reason, the use of biofungicides has been in practice as a green solution against fungal phytopathogens. In the context of a more sustainable agriculture, microbial biofungicides have the largest share among the commercial biocontrol products that are available in the market. Precisely, the genus Bacillus has been largely studied for the management of plant pathogenic fungi because they offer a chemically diverse arsenal of antifungal secondary metabolites, which have spawned a heightened industrial engrossment of it as a biopesticide. In this sense, it is indispensable to know the wide arsenal that Bacillus genus has to apply these products for sustainable agriculture. Having this idea in our minds, in this review, secondary metabolites from Bacillus having antifungal activity are chemically and structurally described giving details of their action against several phytopathogens. Knowing the current status of Bacillus secreted antifungals is the base for the goal to apply these in agriculture and it is addressed in depth in the second part of this review.
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Affiliation(s)
- Bruno Salazar
- Facultad De Ciencias Químicas, Benemérita Universidad Autónoma De Puebla, 72590, Puebla, Pue, México
| | - Aurelio Ortiz
- Facultad De Ciencias Químicas, Benemérita Universidad Autónoma De Puebla, 72590, Puebla, Pue, México
| | - Chetan Keswani
- Academy of Biology and Biotechnology, Southern Federal University, Rostov-on-Don, 344006, Russia
| | - Tatiana Minkina
- Academy of Biology and Biotechnology, Southern Federal University, Rostov-on-Don, 344006, Russia
| | - Saglara Mandzhieva
- Academy of Biology and Biotechnology, Southern Federal University, Rostov-on-Don, 344006, Russia
| | - Satyendra Pratap Singh
- Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, 221005, India
| | - Bhagwan Rekadwad
- Division of Microbiology and Biotechnology, Yenepoya Research Centre, Yenepoya (Deemed to Be University), Mangalore, 575018, Karnataka, India
| | - Rainer Borriss
- Institut Für Agrar- Und Gartenbauwissenschaften, Fachgebiet Phytomedizin, Humboldt-Universität Zu Berlin, Lentze-Allee 55-57, 14195, Berlin, Germany
| | - Akansha Jain
- Division of Plant Biology, Bose Institute, CIT Road, Kankurgachi, Kolkata, India
| | - Harikesh B Singh
- Department of Biotechnology, GLA University, Mathura, 281406, India
| | - Estibaliz Sansinenea
- Facultad De Ciencias Químicas, Benemérita Universidad Autónoma De Puebla, 72590, Puebla, Pue, México.
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21
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Aloo BN, Dessureault-Rompré J, Tripathi V, Nyongesa BO, Were BA. Signaling and crosstalk of rhizobacterial and plant hormones that mediate abiotic stress tolerance in plants. Front Microbiol 2023; 14:1171104. [PMID: 37455718 PMCID: PMC10347528 DOI: 10.3389/fmicb.2023.1171104] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 06/15/2023] [Indexed: 07/18/2023] Open
Abstract
Agricultural areas exhibiting numerous abiotic stressors, such as elevated water stress, temperatures, and salinity, have grown as a result of climate change. As such, abiotic stresses are some of the most pressing issues in contemporary agricultural production. Understanding plant responses to abiotic stressors is important for global food security, climate change adaptation, and improving crop resilience for sustainable agriculture, Over the decades, explorations have been made concerning plant tolerance to these environmental stresses. Plant growth-promoting rhizobacteria (PGPR) and their phytohormones are some of the players involved in developing resistance to abiotic stress in plants. Several studies have investigated the part of phytohormones in the ability of plants to withstand and adapt to non-living environmental factors, but very few have focused on rhizobacterial hormonal signaling and crosstalk that mediate abiotic stress tolerance in plants. The main objective of this review is to evaluate the functions of PGPR phytohormones in plant abiotic stress tolerance and outline the current research on rhizobacterial hormonal communication and crosstalk that govern plant abiotic stress responses. The review also includes the gene networks and regulation under diverse abiotic stressors. The review is important for understanding plant responses to abiotic stresses using PGPR phytohormones and hormonal signaling. It is envisaged that PGPR offer a useful approach to increasing plant tolerance to various abiotic stresses. However, further studies can reveal the unclear patterns of hormonal interactions between plants and rhizobacteria that mediate abiotic stress tolerance.
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Affiliation(s)
- B. N. Aloo
- Department of Biological Sciences, University of Eldoret, Eldoret, Kenya
| | | | - V. Tripathi
- Department of Biotechnology, Graphic Era (Deemed to be University), Dehradun, Uttarakhand, India
| | - B. O. Nyongesa
- Department of Biological Sciences, University of Eldoret, Eldoret, Kenya
| | - B. A. Were
- Department of Biological Sciences, University of Eldoret, Eldoret, Kenya
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22
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Bai X, Li Q, Zhang D, Zhao Y, Zhao D, Pan Y, Wang J, Yang Z, Zhu J. Bacillus velezensis Strain HN-Q-8 Induced Resistance to Alternaria solani and Stimulated Growth of Potato Plant. BIOLOGY 2023; 12:856. [PMID: 37372140 DOI: 10.3390/biology12060856] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 06/04/2023] [Accepted: 06/05/2023] [Indexed: 06/29/2023]
Abstract
Bacillus velezensis HN-Q-8, isolated in our previous study, has an antagonistic effect on Alternaria solani. After being pretreated with a fermentation liquid with HN-Q-8 bacterial cell suspensions, the potato leaves inoculated with A. solani displayed smaller lesion areas and less yellowing than the controls. Interestingly, the activity levels of superoxide dismutase, peroxidase, and catalase in potato seedlings were enhanced by the addition of the fermentation liquid with bacterial cells. Additionally, the overexpression of key genes related to induced resistance in the Jasmonate/Ethylene pathway was activated by the addition of the fermentation liquid, suggesting that the HN-Q-8 strain induced resistance to potato early blight. In addition, our laboratory and field experiments showed that the HN-Q-8 strain can promote potato seedling growth and significantly increase tuber yield. The root activity and chlorophyll content of potato seedlings were significantly increased along with the levels of indole acetic acid, gibberellic acid 3, and abscisic acid upon addition of the HN-Q-8 strain. The fermentation liquid with bacterial cells was more efficient in inducing disease resistance and promoting growth than bacterial cell suspensions alone or the fermentation liquid without bacterial cells. Thus, the B. velezensis HN-Q-8 strain is an effective bacterial biocontrol agent, augmenting the options available for potato cultivation.
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Affiliation(s)
- Xuefei Bai
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, China
| | - Qian Li
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, China
| | - Dai Zhang
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, China
| | - Yi Zhao
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, China
| | - Dongmei Zhao
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, China
| | - Yang Pan
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, China
| | - Jinhui Wang
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, China
| | - Zhihui Yang
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, China
| | - Jiehua Zhu
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, China
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23
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Lyu D, Backer R, Berrué F, Martinez-Farina C, Hui JPM, Smith DL. Plant Growth-Promoting Rhizobacteria (PGPR) with Microbial Growth Broth Improve Biomass and Secondary Metabolite Accumulation of Cannabis sativa L. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:7268-7277. [PMID: 37130078 DOI: 10.1021/acs.jafc.2c06961] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Plant growth-promoting rhizobacteria (PGPR) are a sustainable crop production input; some show positive effects under laboratory conditions but poorly colonize host field-grown plants. Inoculating with PGPR in microbial growth medium (e.g., King's B) could overcome this. We evaluated cannabis plant (cv. CBD Kush) growth promotion by inoculating three PGPR (Bacillus sp., Mucilaginibacter sp., and Pseudomonas sp.) in King's B at vegetative and flower stages. At the vegetative stage, Mucilaginibacter sp. inoculation increased flower dry weight (24%), total CBD (11.1%), and THC (11.6%); Pseudomonas sp. increased stem (28%) dry matter, total CBD (7.2%), and THC (5.9%); and Bacillus sp. increased total THC by 4.8%. Inoculation with Mucilaginibacter sp. and Pseudomonas sp. at the flowering stage led to 23 and 18% increases in total terpene accumulation, respectively. Overall, vegetative inoculation with PGPR enhanced cannabis yield attributes and chemical profiles. Further research into PGPR inoculation onto cannabis and the subsequent level of colonization could provide key insights regarding PGPR-host interactions.
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Affiliation(s)
- Dongmei Lyu
- Department of Plant Science, McGill University, Sainte-Anne-de-Bellevue H9X3V9, Quebec, Canada
| | - Rachel Backer
- Department of Plant Science, McGill University, Sainte-Anne-de-Bellevue H9X3V9, Quebec, Canada
| | - Fabrice Berrué
- National Research Council Canada, Halifax B3H 3Z1, Nova Scotia, Canada
| | | | - Joseph P M Hui
- National Research Council Canada, Halifax B3H 3Z1, Nova Scotia, Canada
| | - Donald Lawrence Smith
- Department of Plant Science, McGill University, Sainte-Anne-de-Bellevue H9X3V9, Quebec, Canada
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24
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Kiruthika A, Vikram KV, Nivetha N, Asha AD, Chinnusamy V, Kumar A, Paul S. Influence of Thermotolerant Rhizobacteria Bacillus spp. on Biochemical Attributes and Antioxidant Status of Mustard Under High Temperature Stress. Curr Microbiol 2023; 80:169. [PMID: 37024688 DOI: 10.1007/s00284-023-03273-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 03/16/2023] [Indexed: 04/08/2023]
Abstract
Due to global warming, increasing incidences of higher-than-normal temperatures have been observed, which adversely affect seed germination, crop growth, and productivity. Several reports are available on the effect of inoculation with rhizobacteria on plant growth and biochemical attributes; however, information on their influence on seed germination and plant stress levels is lacking. In the present study, under heat stress, we studied the effect of three thermotolerant rhizobacterial strains on mustard seed germination, seedling vigor, and plant growth. Effect of inoculation with the rhizobacterial strains on the plant stress levels, biochemical attributes and antioxidant activity was also determined. Under heat stress, inoculation with the rhizobacterial strains improved seed germination and seedling fresh weight and plumule length; while only Bacillus licheniformis SSA 61 inoculated plants showed better radicle length. There was a concomitant decrease in the plant ethylene levels in the inoculated treatments. Inoculated plants showed higher shoot fresh weight, however, Bacillus sp. MRD-17 inoculated plants only improved root growth. There was significant increase in most of the plant biochemical parameters and activities of antioxidant enzymes superoxide dismutase, catalase, and ascorbate peroxidase. Significant reduction in proline and total sugar content was noted in the inoculated treatments; while increase in the amino acid and phenolics content was observed. A further increase in the antioxidant enzyme activity was recorded in most of the inoculated treatments compared with no stress. Thus, our study indicated that thermotolerant rhizobacterial strains reduced plant stress levels; enhanced seed germination, seedling vigor, plant biomass, and thermotolerance of mustard.
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Affiliation(s)
- A Kiruthika
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India
| | - K V Vikram
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Nagarajan Nivetha
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India
| | - A D Asha
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Viswanathan Chinnusamy
- Division of Plant Physiology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Arun Kumar
- National Phytotron Facility, ICAR-Indian Agricultural Research Institute (IARI), New Delhi, 110012, India
| | - Sangeeta Paul
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India.
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25
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Syed A, Elgorban AM, Bahkali AH, Eswaramoorthy R, Iqbal RK, Danish S. Metal-tolerant and siderophore producing Pseudomonas fluorescence and Trichoderma spp. improved the growth, biochemical features and yield attributes of chickpea by lowering Cd uptake. Sci Rep 2023; 13:4471. [PMID: 36934106 PMCID: PMC10024765 DOI: 10.1038/s41598-023-31330-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Accepted: 03/09/2023] [Indexed: 03/20/2023] Open
Abstract
Industrialization and human urbanization have led to an increase in heavy metal (HM) pollution which often cause negative/toxic effect on agricultural crops. The soil-HMs cannot be degraded biologically however, microbe-mediated detoxification of toxic HMs into lesser toxic forms are reported. Considering the potentiality of HMs-tolerant soil microbes in metal detoxification, Pseudomonas fluorescence PGPR-7 and Trichoderma sp. T-4 were recovered from HM-affected areas. Under both normal and cadmium stress, the ability of both microorganisms to produce different plant hormones and biologically active enzymes was examined. Strains PGPR-7 and T-4 tolerated cadmium (Cd) an up-to 1800 and 2000 µg mL-1, respectively, and produced various plant growth regulating substances (IAA, siderophore, ACC deaminase ammonia and HCN) in Cd-stressed condition. The growth promoting and metal detoxifying ability of both strains were evaluated (either singly/combined) by applying them in chickpea (Cicer arietinum L.) plants endogenously contaminated with different Cd levels (0-400 µg kg-1 soils). The higher Cd concentration (400 µg kg-1 soils) negatively influenced the plant parameters which, however, improved following single/combined inoculation of P. fluorescence PGPR-7 and Trichoderma sp. T-4. Both microbial strains increased the growth of Cd-treated chickpeas however, their combined inoculation (PGPR-7 + T-4) caused the most positive effect. For instance, 25 µg Cd Kg-1 + PGPR-7 + T4 treatment caused maximum increase in germination percentage (10%), root dry biomass (71.4%) and vigour index (33%), chl-a (38%), chl-b (41%) and carotenoid content (52%). Furthermore, combined inoculation of P. fluorescence PGPR-7 and Trichoderma sp. T-4 maximally decreased the proline, MDA content, POD and CAT activities by 50%, 43% and 62%, respectively following their application in 25 µg Cd kg-1 soils-treated chickpea. Additionally, microbial strains lowered the plant uptake of Cd. For example, Cd-uptake in root tissues was decreased by 42 and 34% when 25 µg Cd Kg-1- treated chickpea plants were inoculated with P. fluorescence PGPR-7, Trichoderma sp. T-4 and co-inoculation (PGPR-7 + T4) of both strains, respectively. Therefore, from the current observation, it is suggested that dual inoculation of metal tolerant P. fluorescence and Trichoderma sp. may potentially be used in detoxification and reclamation of metal-contaminated soils.
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Affiliation(s)
- Asad Syed
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh, 11451, Saudi Arabia
| | - Abdallah M Elgorban
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh, 11451, Saudi Arabia
| | - Ali H Bahkali
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh, 11451, Saudi Arabia
| | - Rajalakshmanan Eswaramoorthy
- Department of Prosthodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Chennai, 600 077, India.
| | - Rana Khalid Iqbal
- Institute of Molecular Biology and Biotechnology, Bahauddin Zakariya University, Multan, Punjab, Pakistan
- Department of Biology, University of Padova, Padua, Italy
| | - Subhan Danish
- Department of Soil Science, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan, Punjab, Pakistan.
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Kaushal P, Ali N, Saini S, Pati PK, Pati AM. Physiological and molecular insight of microbial biostimulants for sustainable agriculture. FRONTIERS IN PLANT SCIENCE 2023; 14:1041413. [PMID: 36794211 PMCID: PMC9923114 DOI: 10.3389/fpls.2023.1041413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2022] [Accepted: 01/13/2023] [Indexed: 06/18/2023]
Abstract
Increased food production to cater the need of growing population is one of the major global challenges. Currently, agro-productivity is under threat due to shrinking arable land, increased anthropogenic activities and changes in the climate leading to frequent flash floods, prolonged droughts and sudden fluctuation of temperature. Further, warm climatic conditions increase disease and pest incidences, ultimately reducing crop yield. Hence, collaborated global efforts are required to adopt environmentally safe and sustainable agro practices to boost crop growth and productivity. Biostimulants appear as a promising means to improve growth of plants even under stressful conditions. Among various categories of biostimulants, microbial biostimulants are composed of microorganisms such as plant growth-promoting rhizobacteria (PGPR) and/or microbes which stimulate nutrient uptake, produce secondary metabolites, siderophores, hormones and organic acids, participate in nitrogen fixation, imparts stress tolerance, enhance crop quality and yield when applied to the plants. Though numerous studies convincingly elucidate the positive effects of PGPR-based biostimulants on plants, yet information is meagre regarding the mechanism of action and the key signaling pathways (plant hormone modulations, expression of pathogenesis-related proteins, antioxidants, osmolytes etc.) triggered by these biostimulants in plants. Hence, the present review focuses on the molecular pathways activated by PGPR based biostimulants in plants facing abiotic and biotic challenges. The review also analyses the common mechanisms modulated by these biostimulants in plants to combat abiotic and biotic stresses. Further, the review highlights the traits that have been modified through transgenic approach leading to physiological responses akin to the application of PGPR in the target plants.
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Affiliation(s)
- Priya Kaushal
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, HP, India
| | - Nilofer Ali
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, HP, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Shivani Saini
- Department of Botany, Goswami Ganesh Dutta Sanatan Dharma College, Chandigarh, India
| | - Pratap Kumar Pati
- Department of Biotechnology, Guru Nanak Dev University, Amritsar, Punjab, India
| | - Aparna Maitra Pati
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, HP, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
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27
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Bioinoculant mediated regulation of signalling cascades in various stress responses in plants. Heliyon 2023; 9:e12953. [PMID: 36711264 PMCID: PMC9873674 DOI: 10.1016/j.heliyon.2023.e12953] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 12/26/2022] [Accepted: 01/10/2023] [Indexed: 01/15/2023] Open
Abstract
Bio-inoculation involves the association of plant with some beneficial microorganisms, and among these microbiotas, those bacteria which can promote plant growth and development are known as Plant Growth Promoting Rhizobacteria (PGPR). It can help a plant directly or indirectly, which includes root development, biological nitrogen (N2) fixation, stress tolerance, cell division and elongation, solubilization of Zinc, Phosphate, Potassium, soil health improvement and many more. PGPR have gained attention as it can be used as biofertilizers and helpful in bioremediation techniques, which in turn can reduce the chemical dependency in agriculture. PGPR mediated plant growth and stress management is developed by the virtue of the interaction of plant and microbial signalling pathways. On the other hand, environmental stresses are something to which a plant is always exposed irrespective of other factors. The present review is all about the better understanding of the convergence strategies of these signalling molecules and the ambiguities of signalling activities occurring in the host due to the interaction with PGPR under environmental stressed conditions.
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Verma KK, Song XP, Li DM, Singh M, Wu JM, Singh RK, Sharma A, Zhang BQ, Li YR. Silicon and soil microorganisms improve rhizospheric soil health with bacterial community, plant growth, performance and yield. PLANT SIGNALING & BEHAVIOR 2022; 17:2104004. [PMID: 35943127 PMCID: PMC9364706 DOI: 10.1080/15592324.2022.2104004] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 07/13/2022] [Accepted: 07/15/2022] [Indexed: 06/15/2023]
Abstract
The interaction of silicon and soil microorganisms stimulates crop enhancement to ensure sustainable agriculture. Silicon may potentially increase nutrient availability in rhizosphere with improved plants' growth, development as it does not produce phytotoxicity. The rhizospheric microbiome accommodates a variety of microbial species that live in a small area of soil directly associated with the hidden half plants' system. Plant growth-promoting rhizobacteria (PGPR) play a major role in plant development in response to adverse climatic conditions. PGPRs may enhance the growth, quality, productivity in variety of crops, and mitigate abiotic stresses by reprogramming stress-induced physiological variations in plants via different mechanisms, such as synthesis of indole-3-acetic acid, 1-aminocyclopropane-1-carboxylate deaminase, exopolysaccharides, volatile organic compounds, atmospheric nitrogen fixation, and phosphate solubilization. Our article eye upon interactions of silicon and plant microbes which seems to be an opportunity for sustainable agriculture for series of crops and cropping systems in years to come, essential to safeguard the food security for masses.
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Affiliation(s)
- Krishan K. Verma
- Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture and Rural Affairs/Guangxi Key Laboratory of Sugarcane Genetic Improvement/Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences/ Sugarcane Research Center, Chinese Academy of Agricultural Sciences, Nanning, China
| | - Xiu-Peng Song
- Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture and Rural Affairs/Guangxi Key Laboratory of Sugarcane Genetic Improvement/Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences/ Sugarcane Research Center, Chinese Academy of Agricultural Sciences, Nanning, China
| | - Dong-Mei Li
- Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture and Rural Affairs/Guangxi Key Laboratory of Sugarcane Genetic Improvement/Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences/ Sugarcane Research Center, Chinese Academy of Agricultural Sciences, Nanning, China
| | - Munna Singh
- Department of Botany, University of Lucknow, Lucknow, India
| | - Jian-Ming Wu
- Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture and Rural Affairs/Guangxi Key Laboratory of Sugarcane Genetic Improvement/Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences/ Sugarcane Research Center, Chinese Academy of Agricultural Sciences, Nanning, China
| | - Rajesh Kumar Singh
- Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture and Rural Affairs/Guangxi Key Laboratory of Sugarcane Genetic Improvement/Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences/ Sugarcane Research Center, Chinese Academy of Agricultural Sciences, Nanning, China
| | - Anjney Sharma
- Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture and Rural Affairs/Guangxi Key Laboratory of Sugarcane Genetic Improvement/Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences/ Sugarcane Research Center, Chinese Academy of Agricultural Sciences, Nanning, China
| | - Bao-Qing Zhang
- Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture and Rural Affairs/Guangxi Key Laboratory of Sugarcane Genetic Improvement/Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences/ Sugarcane Research Center, Chinese Academy of Agricultural Sciences, Nanning, China
| | - Yang-Rui Li
- Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture and Rural Affairs/Guangxi Key Laboratory of Sugarcane Genetic Improvement/Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences/ Sugarcane Research Center, Chinese Academy of Agricultural Sciences, Nanning, China
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Ganesh J, Singh V, Hewitt K, Kaundal A. Exploration of the rhizosphere microbiome of native plant Ceanothus velutinus - an excellent resource of plant growth-promoting bacteria. FRONTIERS IN PLANT SCIENCE 2022; 13:979069. [PMID: 36589081 PMCID: PMC9798410 DOI: 10.3389/fpls.2022.979069] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 11/21/2022] [Indexed: 06/17/2023]
Abstract
Continuous demand for an increase in food production due to climate change and a steady rise in world population requires stress-resilient, sustainable agriculture. Overuse of chemical fertilizers and monoculture farming to achieve this goal deteriorated soil health and negatively affected its microbiome. The rhizosphere microbiome of a plant plays a significant role in its growth and development and promotes the plant's overall health through nutrient uptake/availability, stress tolerance, and biocontrol activity. The Intermountain West (IW) region of the US is rich in native plants recommended for low water use landscaping because of their drought tolerance. The rhizosphere microbiome of these native plants is an excellent resource for plant growth-promoting rhizobacteria (PGPR) to use these microbes as biofertilizers and biostimulants to enhance food production, mitigate environmental stresses and an alternative for chemical fertilizer, and improve soil health. Here, we isolated, purified, identified, and characterized 64 bacterial isolates from a native plant, Ceanothus velutinus, commonly known as snowbrush ceanothus, from the natural habitat and the greenhouse-grown native soil-treated snowbrush ceanothus plants. We also conducted a microbial diversity analysis of the rhizosphere of greenhouse-grown native soil-treated and untreated plants (control). Twenty-seven of the 64 isolates were from the rhizosphere of the native region, and 36 were from the greenhouse-grown native soil-treated plants. These isolates were also tested for plant growth-promoting (PGP) traits such as their ability to produce catalase, siderophore, and indole acetic acid, fix atmospheric nitrogen and solubilize phosphate. Thirteen bacterial isolates tested positive for all five plant growth-promoting abilities and belonged to the genera Pantoea, Pseudomonas, Bacillus, and Ancylobacter. Besides, there are isolates belonging to the genus Streptomyces, Bacillus, Peribacillus, Variovorax, Xenophilus, Brevundimonas, and Priestia, which exhibit at least one of the plant growth-promoting activities. This initial screen provided a list of potential PGPR to test for plant health improvement on model and crop plants. Most of the bacterial isolates in this study have a great potential to become biofertilizers and bio-stimulants.
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Affiliation(s)
| | | | | | - Amita Kaundal
- Department of Plants, Soils, and Climate, College of Agriculture and Applied Sciences, Utah State University, Logan, UT, United States
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Khan AR, Mustafa A, Hyder S, Valipour M, Rizvi ZF, Gondal AS, Yousuf Z, Iqbal R, Daraz U. Bacillus spp. as Bioagents: Uses and Application for Sustainable Agriculture. BIOLOGY 2022; 11:biology11121763. [PMID: 36552272 PMCID: PMC9775066 DOI: 10.3390/biology11121763] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 11/28/2022] [Accepted: 11/30/2022] [Indexed: 12/12/2022]
Abstract
Food security will be a substantial issue in the near future due to the expeditiously growing global population. The current trend in the agriculture industry entails the extravagant use of synthesized pesticides and fertilizers, making sustainability a difficult challenge. Land degradation, lower production, and vulnerability to both abiotic and biotic stresses are problems caused by the usage of these pesticides and fertilizers. The major goal of sustainable agriculture is to ameliorate productivity and reduce pests and disease prevalence to such a degree that prevents large-scale damage to crops. Agriculture is a composite interrelation among plants, microbes, and soil. Plant microbes play a major role in growth promotion and improve soil fertility as well. Bacillus spp. produces an extensive range of bio-chemicals that assist in plant disease control, promote plant development, and make them suitable for agricultural uses. Bacillus spp. support plant growth by N fixation, P and K solubilization, and phytohormone synthesis, in addition to being the most propitious biocontrol agent. Moreover, Bacilli excrete extracellular metabolites, including antibiotics, lytic enzymes, and siderophores, and demonstrate antagonistic activity against phytopathogens. Bacillus spp. boosts plant resistance toward pathogens by inducing systemic resistance (ISR). The most effective microbial insecticide against insects and pests in agriculture is Bacillus thuringiensis (Bt). Additionally, the incorporation of toxin genes in genetically modified crops increases resistance to insects and pests. There is a constant increase in the identified Bacillus species as potential biocontrol agents. Moreover, they have been involved in the biosynthesis of metallic nanoparticles. The main objective of this review article is to display the uses and application of Bacillus specie as a promising biopesticide in sustainable agriculture. Bacillus spp. strains that are antagonistic and promote plant yield attributes could be valuable in developing novel formulations to lead the way toward sustainable agriculture.
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Affiliation(s)
- Aimen Razzaq Khan
- Department of Botany, Government College Women University Sialkot, Sialkot 51310, Pakistan
| | - Adeena Mustafa
- Department of Botany, Government College Women University Sialkot, Sialkot 51310, Pakistan
| | - Sajjad Hyder
- Department of Botany, Government College Women University Sialkot, Sialkot 51310, Pakistan
- Correspondence: (S.H.); (M.V.)
| | - Mohammad Valipour
- Department of Engineering and Engineering Technology, Metropolitan State University of Denver, Denver, CO 80217, USA
- Correspondence: (S.H.); (M.V.)
| | - Zarrin Fatima Rizvi
- Department of Botany, Government College Women University Sialkot, Sialkot 51310, Pakistan
| | - Amjad Shahzad Gondal
- Department of Plant Pathology, Bahauddin Zakariya University Multan, Multan 60000, Pakistan
| | - Zubaida Yousuf
- Department of Botany, Lahore College for Women University, Lahore 54000, Pakistan
| | - Rashid Iqbal
- Department of Agronomy, Faculty of Agriculture and Environment, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan
| | - Umar Daraz
- State Key Laboratory of Grassland Agroecosystem, Center for Grassland Microbiome, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730000, China
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Lin W, Liu L, Liang J, Tang X, Shi J, Zhang L, Wu P, Lan S, Wang S, Zhou Y, Chen X, Zhao Y, Chen X, Wu B, Guo L. Changes of endophytic microbial community in Rhododendron simsii roots under heat stress and its correlation with leaf physiological indicators. Front Microbiol 2022; 13:1006686. [PMID: 36466690 PMCID: PMC9712210 DOI: 10.3389/fmicb.2022.1006686] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 11/01/2022] [Indexed: 08/05/2023] Open
Abstract
Introduction The response mechanism of Rhododendron simsii and its endophytic microorganism to heat stress is still unclear. Methods The light incubator was used to set the temperature gradients, and the control (CK) was (day/night: 14/10 h) 25/22°C, the moderate-heat-stress (MHS) was 35/30°C and the high-heat-stress (HHS) was 40/35°C. Results Compared with CK, MHS significantly increased the contents of malondialdehyde, hydrogen peroxide, proline, and soluble sugar, as well as the activities of catalase and peroxidase in leaf, while HHS increased the activities of ascorbate peroxidase, and decreased chlorophyll content. Compared with CK, MHS reduced soil available nitrogen (N) content. Both heat stress changed the endophytic microbial community structure in roots. MHS enriched Pezicula and Paracoccus, while HHS significantly enriched Acidothermus and Haliangium. The abundance of Pezicula positively correlated with the contents of chlorophyll a and proline in leaf, and negatively correlated with soil ammonium N content. The abundance of Pezicula and Haliangium positively correlated with soluble sugar and malondialdehyde contents, respectively. Conclusions Our results suggest that root endophytic microorganisms play an important role in helping Rhododendron resisting heat stress, mainly by regulating soil N content and plant physiological characteristics.
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Affiliation(s)
- Wei Lin
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Lei Liu
- Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, Ministry of Education/College of Forestry, Hainan University, Haikou, China
| | - Jincheng Liang
- Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, Ministry of Education/College of Forestry, Hainan University, Haikou, China
| | - Xuexiao Tang
- Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, Ministry of Education/College of Forestry, Hainan University, Haikou, China
| | - Jie Shi
- State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Civil Engineering, Tianjin University, Tianjin, China
| | - Li Zhang
- College of Tropical Crops, Hainan University, Haikou, China
| | - Purui Wu
- Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, Ministry of Education/College of Forestry, Hainan University, Haikou, China
| | - Siren Lan
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Shusheng Wang
- Lushan Botanical Garden, Jiangxi Province and Chinese Academy of Sciences, Lushan, China
| | - Yan Zhou
- Guizhou Botanical Garden, Guiyang, China
| | | | - Ying Zhao
- Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, Ministry of Education/College of Forestry, Hainan University, Haikou, China
| | - Xiang Chen
- Institute of Biology, Guizhou Academy of Sciences, Guiyang, China
| | - Binghua Wu
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Lijin Guo
- Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, Ministry of Education/College of Forestry, Hainan University, Haikou, China
- International Magnesium Institute, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, China
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Antoszewski M, Mierek-Adamska A, Dąbrowska GB. The Importance of Microorganisms for Sustainable Agriculture-A Review. Metabolites 2022; 12:1100. [PMID: 36422239 PMCID: PMC9694901 DOI: 10.3390/metabo12111100] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 11/04/2022] [Accepted: 11/08/2022] [Indexed: 08/27/2023] Open
Abstract
In the face of climate change, progressive degradation of the environment, including agricultural land negatively affecting plant growth and development, endangers plant productivity. Seeking efficient and sustainable agricultural techniques to replace agricultural chemicals is one of the most important challenges nowadays. The use of plant growth-promoting microorganisms is among the most promising approaches; however, molecular mechanisms underneath plant-microbe interactions are still poorly understood. In this review, we summarized the knowledge on plant-microbe interactions, highlighting the role of microbial and plant proteins and metabolites in the formation of symbiotic relationships. This review covers rhizosphere and phyllosphere microbiomes, the role of root exudates in plant-microorganism interactions, the functioning of the plant's immune system during the plant-microorganism interactions. We also emphasized the possible role of the stringent response and the evolutionarily conserved mechanism during the established interaction between plants and microorganisms. As a case study, we discussed fungi belonging to the genus Trichoderma. Our review aims to summarize the existing knowledge about plant-microorganism interactions and to highlight molecular pathways that need further investigation.
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Affiliation(s)
| | - Agnieszka Mierek-Adamska
- Department of Genetics, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University, Lwowska 1, 87-100 Toruń, Poland
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Deng C, Zhang N, Liang X, Huang T, Li B. Bacillus aryabhattai LAD impacts rhizosphere bacterial community structure and promotes maize plant growth. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2022; 102:6650-6657. [PMID: 35603593 DOI: 10.1002/jsfa.12032] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 05/20/2022] [Accepted: 05/23/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND Plant growth-promoting rhizobacteria may significantly impact the soil microbial community and the growth of plant roots and have critical roles in soil ecosystem functioning. However, the interactions between rhizobacteria and plants are extremely complicated and remain understudied. RESULTS In this study, a Bacillus strain was isolated from a long-term maize colonization soil and identified as Bacillus aryabhattai strain LAD. Laboratory tests showed that B. aryabhattai LAD had phosphate-solubilizing and nitrogen-fixing functions that benefit plant growth. The effects of LAD cultures on the root system development of corn seedlings and the structure of rhizosphere bacterial communities were studied. The most significant stimulations of LAD culture on plant growth were observed at a cell density of 102 CFU mL-1 . Treatment with LAD culture in hydroponics caused an increase of 107%, 197%, and 25% in the shoot length, total root length, and main root thickness respectively. The LAD treatment also significantly affected the rhizosphere microbial abundance and community structure. The rhizobacterial abundance and species richness in the corn seedlings treated with LAD culture were significantly lower than those in the control group. However, the LAD-treated samples had higher relative abundances of plant growth-promoting rhizobacteria like Bacillus and Burkholderia than the control samples did, suggesting that LAD treatment may facilitate the mutualistic relation between the rhizosphere microbiome and the plant. CONCLUSION These results collectively demonstrated that LAD is capable of shaping the rhizosphere microbial community structure and functions as a plant growth-promoting agent, which makes it a strong candidate for application as bio-fertilizer in agricultural systems. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Chao Deng
- College of Land and Environment, Shenyang Agricultural University, Shenyang, China
| | - Ning Zhang
- College of Bioscience and Biotechnology, Shenyang Agricultural University, Shenyang, China
| | - Xiaolong Liang
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
| | - Tao Huang
- College of Land and Environment, Shenyang Agricultural University, Shenyang, China
| | - Bingxue Li
- College of Land and Environment, Shenyang Agricultural University, Shenyang, China
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Deng C, Liang X, Zhang N, Li B, Wang X, Zeng N. Molecular mechanisms of plant growth promotion for methylotrophic Bacillus aryabhattai LAD. Front Microbiol 2022; 13:917382. [PMID: 36353455 PMCID: PMC9637944 DOI: 10.3389/fmicb.2022.917382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 10/10/2022] [Indexed: 11/30/2022] Open
Abstract
Plant growth-promoting rhizobacteria (PGPR) can produce hormone-like substances, promote plant nutrient uptake, enhance plant resistance, inhibit the growth of pathogenic bacteria, and induce plant resistance to biotic and abiotic stresses. Bacillus is one of the most studied genera that promote plant root development. Since its discovery in 2009, B. aryabhattai has shown promising properties such as promoting plant growth and improving crop yield. However, the mechanisms of B. aryabhattai promoting plant growth remain to be investigated. In this study, the chromosome of B. aryabhattai strain LAD and five plasmids within the cell were sequenced and annotated. The genome, with a length of 5,194,589 bp and 38.12% GC content, contains 5,288 putative protein-coding genes, 39 rRNA, and 112 tRNA. The length of the five plasmids ranged from 116,519 to 212,484 bp, and a total of 810 putative protein-coding genes, 4 rRNA, and 32 tRNA were predicted in the plasmids. Functional annotation of the predicted genes revealed numerous genes associated with indole-3 acetic acid (IAA) and exopolysaccharides (EPSs) biosynthesis, membrane transport, nitrogen cycle metabolism, signal transduction, cell mobility, stress response, and antibiotic resistance on the genome which benefits the plants. Genes of carbohydrate-active enzymes were detected in both the genome and plasmids suggesting that LAD has the capacity of synthesizing saccharides and utilizing organic materials like root exudates. LAD can utilize different carbon sources of varied carbon chain length, i.e., methanol, acetate, glycerol, glucose, sucrose, and starch for growth and temperature adaptation suggesting a high versatility of LAD for thriving in fluctuating environments. LAD produced the most EPSs with sucrose as sole carbon source, and high concentration of IAA was produced when the maize plant was cultivated with LAD, which may enhance plant growth. LAD significantly stimulated the development of the maize root. The genome-based information and experimental evidence demonstrated that LAD with diverse metabolic capabilities and positive interactions with plants has tremendous potential for adaptation to the dynamic soil environments and promoting plant growth.
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Affiliation(s)
- Chao Deng
- College of Land and Environment, Shenyang Agricultural University, Shenyang, China
| | - Xiaolong Liang
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
| | - Ning Zhang
- College of Bioscience and Biotechnology, Shenyang Agricultural University, Shenyang, China
- Ning Zhang,
| | - Bingxue Li
- College of Land and Environment, Shenyang Agricultural University, Shenyang, China
- *Correspondence: Bingxue Li,
| | - Xiaoyu Wang
- College of Land and Environment, Shenyang Agricultural University, Shenyang, China
| | - Nan Zeng
- College of Land and Environment, Shenyang Agricultural University, Shenyang, China
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Xing P, Zhao Y, Guan D, Li L, Zhao B, Ma M, Jiang X, Tian C, Cao F, Li J. Effects of Bradyrhizobium Co-Inoculated with Bacillus and Paenibacillus on the Structure and Functional Genes of Soybean Rhizobacteria Community. Genes (Basel) 2022; 13:1922. [PMID: 36360159 PMCID: PMC9689485 DOI: 10.3390/genes13111922] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 10/14/2022] [Accepted: 10/17/2022] [Indexed: 10/31/2023] Open
Abstract
Plant growth-promoting rhizobacteria (PGPR) are widely used to improve soil nutrients and promote plant growth and health. However, the growth-promoting effect of a single PGPR on plants is limited. Here, we evaluated the effect of applying rhizobium Bradyrhizobium japonicum 5038 (R5038) and two PGPR strains, Bacillus aryabhattai MB35-5 (BA) and Paenibacillus mucilaginosus 3016 (PM), alone or in different combinations on the soil properties and rhizosphere bacterial community composition of soybean (Glycine max). Additionally, metagenomic sequencing was performed to elucidate the profile of functional genes. Inoculation with compound microbial inoculant containing R5038 and BA (RB) significantly improved nodule nitrogenase activity and increased soil nitrogen content, and urease activity increased the abundance of the nitrogen cycle genes and Betaproteobacteria and Chitinophagia in the rhizosphere. In the treatment of inoculant-containing R5038 and PM (RP), significant changes were found for the abundance of Deltaproteobacteria and Gemmatimonadetes and the phosphorus cycle genes, and soil available phosphorus and phosphatase activity were increased. The RBP inoculants composed of three strains (R5038, BA and PM) significantly affected soybean biomass and the N and P contents of the rhizosphere. Compared with RB and RP, RBP consistently increased soybean nitrogen content, and dry weight. Overall, these results showed that several PGPR with different functions could be combined into composite bacterial inoculants, which coordinately modulate the rhizosphere microbial community structure and improve soybean growth.
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Affiliation(s)
- Pengfei Xing
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- State Key Laboratory of Agrobiotechnology and Key Laboratory of Soil Microbiology, Ministry of Agriculture, College of Biological Sciences, China Agricultural University, Beijing 100094, China
| | - Yubin Zhao
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- Laboratory of Quality & Safety Risk Assessment for Microbial Products, Ministry of Agriculture, Beijing 100081, China
| | - Dawei Guan
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Li Li
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Baisuo Zhao
- Laboratory of Quality & Safety Risk Assessment for Microbial Products, Ministry of Agriculture, Beijing 100081, China
| | - Mingchao Ma
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- Laboratory of Quality & Safety Risk Assessment for Microbial Products, Ministry of Agriculture, Beijing 100081, China
| | - Xin Jiang
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- Laboratory of Quality & Safety Risk Assessment for Microbial Products, Ministry of Agriculture, Beijing 100081, China
| | - Changfu Tian
- State Key Laboratory of Agrobiotechnology and Key Laboratory of Soil Microbiology, Ministry of Agriculture, College of Biological Sciences, China Agricultural University, Beijing 100094, China
| | - Fengming Cao
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- Laboratory of Quality & Safety Risk Assessment for Microbial Products, Ministry of Agriculture, Beijing 100081, China
| | - Jun Li
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- Laboratory of Quality & Safety Risk Assessment for Microbial Products, Ministry of Agriculture, Beijing 100081, China
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Jabborova D, Davranov K, Jabbarov Z, Bhowmik SN, Ercisli S, Danish S, Singh S, Desouky SE, Elazzazy AM, Nasif O, Datta R. Dual Inoculation of Plant Growth-Promoting Bacillus endophyticus and Funneliformis mosseae Improves Plant Growth and Soil Properties in Ginger. ACS OMEGA 2022; 7:34779-34788. [PMID: 36211029 PMCID: PMC9535732 DOI: 10.1021/acsomega.2c02353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 09/02/2022] [Indexed: 06/16/2023]
Abstract
Co-inoculation with beneficial microbes has been suggested as a useful practice for the enhancement of plant growth, nutrient uptake, and soil nutrients. For the first time in Uzbekistan the role of plant-growth-promoting Bacillus endophyticus IGPEB 33 and arbuscular mycorrhizal fungi (AMF) on plant growth, the physiological properties of ginger (Zingiber officinale), and soil enzymatic activities was studied. Moreover, the coinoculation of B. endophyticus IGPEB 33 and AMF treatment significantly increased the plant height by 81%, leaf number by 70%, leaf length by 82%, and leaf width by 40% compared to the control. B. endophyticus IGPEB 33 individually increased plant height significantly by 51%, leaf number by 56%, leaf length by 67%, and leaf width by 27% as compared to the control treatment. Compared to the control, B. endophyticus IGPEB 33 and AMF individually significantly increased chlorophyll a by 81-58%, chlorophyll b by 68-37%, total chlorophyll by 74-53%, and carotenoid content by 67-55%. However, combination of B. endophyticus IGPEB 33 and AMF significantly increased chlorophyll a by 86%, chlorophyll b by 72%, total chlorophyll by 82%, and carotenoid content by 83% compared to the control. Additionally, plant-growth-promoting B. endophyticus IGPEB 33 and AMF inoculation improved soil nutrients and soil enzyme activities compared to the all treatments. Co-inoculation with plant-growth-promoting B. endophyticus and AMF could be an alternative for the production of ginger that is more beneficial to soil nutrient deficiencies. We suggest that a combination of plant-growth-promoting B. endophyticus and AMF inoculation could be a more sustainable and eco-friendly approach in a nutrient-deficient soil.
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Affiliation(s)
- Dilfuza Jabborova
- Institute
of Genetics and Plant Experimental Biology, Uzbekistan Academy of Sciences, Kibray 111208, Uzbekistan
- Faculty
of Biology, National University of Uzbekistan, Tashkent 100174, Uzbekistan
| | - Kakhramon Davranov
- Institute
of Microbiology of the Academy of Sciences of Uzbekistan, Tashkent 100174, Uzbekistan
| | - Zafarjon Jabbarov
- Faculty
of Biology, National University of Uzbekistan, Tashkent 100174, Uzbekistan
| | - Subrata Nath Bhowmik
- Division
of Microbiology, ICAR-Indian Agricultural
Research Institute, Pusa,
New Delhi 110012, India
| | - Sezai Ercisli
- Department
of Horticulture, Agricultural Faculty, Ataturk
University, Erzurum 252240, Turkey
| | - Subhan Danish
- Department
of Soil Science, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan 60000, Pakistan
| | - Sachidanand Singh
- Department
of Biotechnology, Smt. S. S. Patel Nootan
Science & Commerce College, Sankalchand Patel University, Visnagar 384315, Gujarat, India
| | - Said E. Desouky
- Department
of Botany and Microbiology, Faculty of Science,
Al-azhar University, 11884 Nasr, Cairo, Egypt
| | - Ahmed M. Elazzazy
- Department
of Chemistry of Natural and Microbial Products, Pharmaceutical and Drug Industries Institute, National Research Centre, Dokki, Giza 12622, Egypt
| | - Omaima Nasif
- King Saud
University, Department of Physiology, College of Medicine and King
Khalid University Hospital, King Saud University, Medical City, P.O. Box 2925, Riyadh 11461, Saudi Arabia
| | - Rahul Datta
- Department
of Geology and Pedology, Faculty of Forestry and Wood Technology, Mendel University in Brno, Zemedelska 1, 61300 Brno, Czech Republic
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Tsotetsi T, Nephali L, Malebe M, Tugizimana F. Bacillus for Plant Growth Promotion and Stress Resilience: What Have We Learned? PLANTS (BASEL, SWITZERLAND) 2022; 11:2482. [PMID: 36235347 PMCID: PMC9571655 DOI: 10.3390/plants11192482] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Revised: 09/15/2022] [Accepted: 09/19/2022] [Indexed: 06/12/2023]
Abstract
The rhizosphere is a thin film of soil that surrounds plant roots and the primary location of nutrient uptake, and is where important physiological, chemical, and biological activities are occurring. Many microbes invade the rhizosphere and have the capacity to promote plant growth and health. Bacillus spp. is the most prominent plant growth promoting rhizobacteria due to its ability to form long-lived, stress-tolerant spores. Bacillus-plant interactions are driven by chemical languages constructed by a wide spectrum of metabolites and lead to enhanced plant growth and defenses. Thus, this review is a synthesis and a critical assessment of the current literature on the application of Bacillus spp. in agriculture, highlighting gaps that remain to be explored to improve and expand on the Bacillus-based biostimulants. Furthermore, we suggest that omics sciences, with a focus on metabolomics, offer unique opportunities to illuminate the chemical intercommunications between Bacillus and plants, to elucidate biochemical and molecular details on modes of action of Bacillus-based formulations, to generate more actionable insights on cellular and molecular events that explain the Bacillus-induced growth promotion and stress resilience in plants.
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Affiliation(s)
- Teboho Tsotetsi
- Department of Biochemistry, University of Johannesburg, Auckland Park, Johannesburg 2006, South Africa
| | - Lerato Nephali
- Department of Biochemistry, University of Johannesburg, Auckland Park, Johannesburg 2006, South Africa
| | - Motumiseng Malebe
- Department of Biochemistry, University of Johannesburg, Auckland Park, Johannesburg 2006, South Africa
| | - Fidele Tugizimana
- Department of Biochemistry, University of Johannesburg, Auckland Park, Johannesburg 2006, South Africa
- International R&D Division, Omnia Nutriology, Omnia Group (Pty) Ltd., Johannesburg 2021, South Africa
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Schmitz L, Yan Z, Schneijderberg M, de Roij M, Pijnenburg R, Zheng Q, Franken C, Dechesne A, Trindade LM, van Velzen R, Bisseling T, Geurts R, Cheng X. Synthetic bacterial community derived from a desert rhizosphere confers salt stress resilience to tomato in the presence of a soil microbiome. THE ISME JOURNAL 2022; 16:1907-1920. [PMID: 35444261 PMCID: PMC9296610 DOI: 10.1038/s41396-022-01238-3] [Citation(s) in RCA: 54] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 03/24/2022] [Accepted: 04/04/2022] [Indexed: 02/06/2023]
Abstract
The root bacterial microbiome is important for the general health of the plant. Additionally, it can enhance tolerance to abiotic stresses, exemplified by plant species found in extreme ecological niches like deserts. These complex microbe-plant interactions can be simplified by constructing synthetic bacterial communities or SynComs from the root microbiome. Furthermore, SynComs can be applied as biocontrol agents to protect crops against abiotic stresses such as high salinity. However, there is little knowledge on the design of a SynCom that offers a consistent protection against salt stress for plants growing in a natural and, therefore, non-sterile soil which is more realistic to an agricultural setting. Here we show that a SynCom of five bacterial strains, originating from the root of the desert plant Indigofera argentea, protected tomato plants growing in a non-sterile substrate against a high salt stress. This phenotype correlated with the differential expression of salt stress related genes and ion accumulation in tomato. Quantification of the SynCom strains indicated a low penetrance into the natural soil used as the non-sterile substrate. Our results demonstrate how a desert microbiome could be engineered into a simplified SynCom that protected tomato plants growing in a natural soil against an abiotic stress.
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Affiliation(s)
- Lucas Schmitz
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Sciences Group, Wageningen University, Droevendaalsesteeg 1, 6708PB, Wageningen, The Netherlands
| | - Zhichun Yan
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Sciences Group, Wageningen University, Droevendaalsesteeg 1, 6708PB, Wageningen, The Netherlands
| | - Martinus Schneijderberg
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Sciences Group, Wageningen University, Droevendaalsesteeg 1, 6708PB, Wageningen, The Netherlands
| | - Martijn de Roij
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Sciences Group, Wageningen University, Droevendaalsesteeg 1, 6708PB, Wageningen, The Netherlands
| | - Rick Pijnenburg
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Sciences Group, Wageningen University, Droevendaalsesteeg 1, 6708PB, Wageningen, The Netherlands
| | - Qi Zheng
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Sciences Group, Wageningen University, Droevendaalsesteeg 1, 6708PB, Wageningen, The Netherlands
| | - Carolien Franken
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Sciences Group, Wageningen University, Droevendaalsesteeg 1, 6708PB, Wageningen, The Netherlands
| | - Annemarie Dechesne
- Laboratory of Plant Breeding, Plant Sciences Group, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Luisa M Trindade
- Laboratory of Plant Breeding, Plant Sciences Group, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Robin van Velzen
- Biosystematics, Plant Sciences Group, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Ton Bisseling
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Sciences Group, Wageningen University, Droevendaalsesteeg 1, 6708PB, Wageningen, The Netherlands
| | - Rene Geurts
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Sciences Group, Wageningen University, Droevendaalsesteeg 1, 6708PB, Wageningen, The Netherlands.
| | - Xu Cheng
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Sciences Group, Wageningen University, Droevendaalsesteeg 1, 6708PB, Wageningen, The Netherlands. .,Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China.
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Shaffique S, Khan MA, Wani SH, Pande A, Imran M, Kang SM, Rahim W, Khan SA, Bhatta D, Kwon EH, Lee IJ. A Review on the Role of Endophytes and Plant Growth Promoting Rhizobacteria in Mitigating Heat Stress in Plants. Microorganisms 2022; 10:microorganisms10071286. [PMID: 35889005 PMCID: PMC9319882 DOI: 10.3390/microorganisms10071286] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 06/17/2022] [Accepted: 06/20/2022] [Indexed: 02/04/2023] Open
Abstract
Among abiotic stresses, heat stress is described as one of the major limiting factors of crop growth worldwide, as high temperatures elicit a series of physiological, molecular, and biochemical cascade events that ultimately result in reduced crop yield. There is growing interest among researchers in the use of beneficial microorganisms. Intricate and highly complex interactions between plants and microbes result in the alleviation of heat stress. Plant–microbe interactions are mediated by the production of phytohormones, siderophores, gene expression, osmolytes, and volatile compounds in plants. Their interaction improves antioxidant activity and accumulation of compatible osmolytes such as proline, glycine betaine, soluble sugar, and trehalose, and enriches the nutrient status of stressed plants. Therefore, this review aims to discuss the heat response of plants and to understand the mechanisms of microbe-mediated stress alleviation on a physio-molecular basis. This review indicates that microbes have a great potential to enhance the protection of plants from heat stress and enhance plant growth and yield. Owing to the metabolic diversity of microorganisms, they can be useful in mitigating heat stress in crop plants. In this regard, microorganisms do not present new threats to ecological systems. Overall, it is expected that continued research on microbe-mediated heat stress tolerance in plants will enable this technology to be used as an ecofriendly tool for sustainable agronomy.
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Affiliation(s)
- Shifa Shaffique
- Department of Applied Biosciences, Kyungpook National University, Daegu 41566, Korea; (S.S.); (M.A.K.); (M.I.); (S.-M.K.); (D.B.); (E.-H.K.)
| | - Muhammad Aaqil Khan
- Department of Applied Biosciences, Kyungpook National University, Daegu 41566, Korea; (S.S.); (M.A.K.); (M.I.); (S.-M.K.); (D.B.); (E.-H.K.)
| | - Shabir Hussain Wani
- Mountain Research Center for Field Crops Khudwani, Shere-e-Kashmir University of Agriculture Sciences and Technology Srinagar, Anantnag 190025, Jammu and Kashmir, India;
| | - Anjali Pande
- Laboratory of Plant Molecular Pathology and Functional Genomics, Department of Plant Biosciences, School of Applied Biosciences, College of Agriculture and Life Science, Kyungpook National University, Daegu 41944, Korea; (A.P.); (W.R.)
| | - Muhammad Imran
- Department of Applied Biosciences, Kyungpook National University, Daegu 41566, Korea; (S.S.); (M.A.K.); (M.I.); (S.-M.K.); (D.B.); (E.-H.K.)
| | - Sang-Mo Kang
- Department of Applied Biosciences, Kyungpook National University, Daegu 41566, Korea; (S.S.); (M.A.K.); (M.I.); (S.-M.K.); (D.B.); (E.-H.K.)
| | - Waqas Rahim
- Laboratory of Plant Molecular Pathology and Functional Genomics, Department of Plant Biosciences, School of Applied Biosciences, College of Agriculture and Life Science, Kyungpook National University, Daegu 41944, Korea; (A.P.); (W.R.)
| | - Sumera Afzal Khan
- Centre of Biotechnology and Microbiology, University of Peshawar, Peshawar 45000, Pakistan;
| | - Dibya Bhatta
- Department of Applied Biosciences, Kyungpook National University, Daegu 41566, Korea; (S.S.); (M.A.K.); (M.I.); (S.-M.K.); (D.B.); (E.-H.K.)
| | - Eun-Hae Kwon
- Department of Applied Biosciences, Kyungpook National University, Daegu 41566, Korea; (S.S.); (M.A.K.); (M.I.); (S.-M.K.); (D.B.); (E.-H.K.)
| | - In-Jung Lee
- Department of Applied Biosciences, Kyungpook National University, Daegu 41566, Korea; (S.S.); (M.A.K.); (M.I.); (S.-M.K.); (D.B.); (E.-H.K.)
- Correspondence: ; Tel.: +82-53-950-5708
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Biopriming of Maize Seeds with a Novel Bacterial Strain SH-6 to Enhance Drought Tolerance in South Korea. PLANTS 2022; 11:plants11131674. [PMID: 35807630 PMCID: PMC9268940 DOI: 10.3390/plants11131674] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 06/17/2022] [Accepted: 06/20/2022] [Indexed: 01/23/2023]
Abstract
Maize is the third most common cereal crop worldwide, after rice and wheat, and plays a vital role in preventing global hunger crises. Approximately 50% of global crop yields are reduced by drought stress. Bacteria as biostimulants for biopriming can improve yield and enhance sustainable food production. Further, seed biopriming stimulates plant defense mechanisms. In this study, we isolated bacteria from the rhizosphere of Artemisia plants from Pohang beach, Daegu, South Korea. Twenty-three isolates were isolated and screened for growth promoting potential. Among them, bacterial isolate SH-6 was selected based on maximum induced tolerance to polyethylene glycol-simulated drought. SH-6 showed ABA concentration = 1.06 ± 0.04 ng/mL, phosphate solubilizing index = 3.7, and sucrose concentration = 0.51 ± 0.13 mg/mL. The novel isolate SH-6 markedly enhanced maize seedling tolerance to oxidative stress owing to the presence of superoxide dismutase, catalase, and ascorbate peroxidase activities in the culture media. Additionally, we quantified and standardized the biopriming effect of SH-6 on maize seeds. SH-6 significantly increased maize seedling drought tolerance by up to 20%, resulting in 80% germination potential. We concluded that the novel bacterium isolate SH-6 (gene accession number (OM757882) is a biostimulant that can improve germination performance under drought stress.
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Effect of Trichoderma asperellum on Wheat Plants' Biochemical and Molecular Responses, and Yield under Different Water Stress Conditions. Int J Mol Sci 2022; 23:ijms23126782. [PMID: 35743226 PMCID: PMC9224292 DOI: 10.3390/ijms23126782] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 06/07/2022] [Accepted: 06/16/2022] [Indexed: 02/01/2023] Open
Abstract
Eight Trichoderma strains were evaluated for their potential to protect wheat seedlings against severe (no irrigation within two weeks) water stress (WS). Considering the plant fresh weight and phenotype, T. asperellum T140, which displays 1-aminocyclopropane-1-carboxylic acid deaminase activity and which is able to produce several phytohormones, was selected. The molecular and biochemical results obtained from 4-week-old wheat seedlings linked T140 application with a downregulation in the WS-response genes, a decrease in antioxidant activities, and a drop in the proline content, as well as low levels of hydrogen peroxide and malondialdehyde in response to severe WS. All of these responses are indicative of T140-primed seedlings having a higher tolerance to drought than those that are left untreated. A greenhouse assay performed under high nitrogen fertilization served to explore the long-term effects of T140 on wheat plants subjected to moderate (halved irrigation) WS. Even though all of the plants showed acclimation to moderate WS regardless of T140 application, there was a positive effect exerted by T. asperellum on the level of tolerance of the wheat plants to this stress. Strain T140 modulated the expression of a plant ABA-dependent WS marker and produced increased plant superoxide dismutase activity, which would explain the positive effect of Trichoderma on increasing crop yields under moderate WS conditions. The results demonstrate the effectiveness of T. asperellum T140 as a biostimulant for wheat plants under WS conditions, making them more tolerant to drought.
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Abiala MA, Sahoo L. Bacillus aryabhattai enhanced proline content, stabilized membrane and improved growth of cowpea under NaCl-induced salinity stress. J Appl Microbiol 2022; 133:1520-1533. [PMID: 35686652 DOI: 10.1111/jam.15658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 12/12/2021] [Accepted: 05/31/2022] [Indexed: 11/28/2022]
Abstract
AIMS Salinity stress affects the growth of cowpea particularly at the stages of seed germination and early vegetative growth. This study examined the potential of particular stress-tolerant rhizospheric bacteria to improve the growth of cowpea under conditions of salinity stress. METHODS AND RESULTS Two rhizobacillus genotypes, Bacillus filamentosus-C8 and Bacillus aryabhattai-C29 were evaluated for their potentials to protect cowpea under NaCl-induced salinity stress. At 200 mM of NaCl concentration, control (non-inoculated) cowpea was affected, C8 was not able to significantly (p ≤ 0.05) alleviate the effects of salinity stress on cowpea growth while C29 significantly (p ≤ 0.05) reduced leaf wilting, increased chlorophyll content and improved the growth of cowpea plant under stressed condition. Interestingly, C29 significantly (p ≤ 0.05) induced high proline content and stabilized membrane by loss of electrolytes. CONCLUSION Our results indicate that stabilized membrane and enhanced proline content by Bacillus aryabhattai-C29 supported the growth of cowpea under salinity stress condition. SIGNIFICANCE AND IMPACT OF THE STUDY This study revealed that rhizospheric bacteria screened for salinity stress tolerant have potential to be used as an effective bioprotectant for sustainable growth of cowpea under salinity stress condition.
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Affiliation(s)
- Moses Akindele Abiala
- Department of Biological Sciences, College of Basic and Applied Sciences, Mountain Top University, Ogun State, Nigeria.,Department of Biosciences and Bioengineering, Indian Institute of Technology, Guwahati, Assam, India
| | - Lingaraj Sahoo
- Department of Biosciences and Bioengineering, Indian Institute of Technology, Guwahati, Assam, India
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Vu MT, Geraldi A, Do HDK, Luqman A, Nguyen HD, Fauzia FN, Amalludin FI, Sadila AY, Wijaya NH, Santoso H, Manuhara YSW, Bui LM, Hariyanto S, Wibowo AT. Soil Mineral Composition and Salinity Are the Main Factors Regulating the Bacterial Community Associated with the Roots of Coastal Sand Dune Halophytes. BIOLOGY 2022; 11:biology11050695. [PMID: 35625422 PMCID: PMC9138652 DOI: 10.3390/biology11050695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/15/2022] [Accepted: 04/27/2022] [Indexed: 11/16/2022]
Abstract
Soil salinity and mineral deficiency are major problems in agriculture. Many studies have reported that plant-associated microbiota, particularly rhizosphere and root microbiota, play a crucial role in tolerance against salinity and mineral deficiency. Nevertheless, there are still many unknown parts of plant–microbe interaction, especially regarding their role in halophyte adaptation to coastal ecosystems. Here, we report the bacterial community associated with the roots of coastal sand dune halophytes Spinifex littoreus and Calotropis gigantea, and the soil properties that affect their composition. Strong correlations were observed between root bacterial diversity and soil mineral composition, especially with soil Calcium (Ca), Titanium (Ti), Cuprum (Cu), and Zinc (Zn) content. Soil Ti and Zn content showed a positive correlation with bacterial diversity, while soil Ca and Cu had a negative effect on bacterial diversity. A strong correlation was also found between the abundance of several bacterial species with soil salinity and mineral content, suggesting that some bacteria are responsive to changes in soil salinity and mineral content. Some of the identified bacteria, such as Bacillus idriensis and Kibdelosporangium aridum, are known to have growth-promoting effects on plants. Together, the findings of this work provided valuable information regarding bacterial communities associated with the roots of sand dune halophytes and their interactions with soil properties. Furthermore, we also identified several bacterial species that might be involved in tolerance against stresses. Further work will be focused on isolation and transplantation of these potential microbes, to validate their role in plant tolerance against stresses, not only in their native hosts but also in crops.
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Affiliation(s)
- Minh Thiet Vu
- NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City 70000, Vietnam; (M.T.V.); (H.D.K.D.); (H.D.N.)
| | - Almando Geraldi
- Departement of Biology, Faculty of Science and Technology, Airlangga University, Surabaya 60115, Indonesia; (A.G.); (F.N.F.); (F.I.A.); (A.Y.S.); (N.H.W.); (Y.S.W.M.); (L.M.B.)
- Biotechnology of Tropical Medicinal Plants Research Group, Airlangga University, Surabaya 60115, Indonesia
| | - Hoang Dang Khoa Do
- NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City 70000, Vietnam; (M.T.V.); (H.D.K.D.); (H.D.N.)
| | - Arif Luqman
- Biology Department, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia;
| | - Hoang Danh Nguyen
- NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City 70000, Vietnam; (M.T.V.); (H.D.K.D.); (H.D.N.)
| | - Faiza Nur Fauzia
- Departement of Biology, Faculty of Science and Technology, Airlangga University, Surabaya 60115, Indonesia; (A.G.); (F.N.F.); (F.I.A.); (A.Y.S.); (N.H.W.); (Y.S.W.M.); (L.M.B.)
| | - Fahmi Ikhlasul Amalludin
- Departement of Biology, Faculty of Science and Technology, Airlangga University, Surabaya 60115, Indonesia; (A.G.); (F.N.F.); (F.I.A.); (A.Y.S.); (N.H.W.); (Y.S.W.M.); (L.M.B.)
| | - Aliffa Yusti Sadila
- Departement of Biology, Faculty of Science and Technology, Airlangga University, Surabaya 60115, Indonesia; (A.G.); (F.N.F.); (F.I.A.); (A.Y.S.); (N.H.W.); (Y.S.W.M.); (L.M.B.)
| | - Nabilla Hapsari Wijaya
- Departement of Biology, Faculty of Science and Technology, Airlangga University, Surabaya 60115, Indonesia; (A.G.); (F.N.F.); (F.I.A.); (A.Y.S.); (N.H.W.); (Y.S.W.M.); (L.M.B.)
| | - Heri Santoso
- Generasi Biologi Indonesia (Genbinesia) Foundation, Gresik 61171, Indonesia;
| | - Yosephine Sri Wulan Manuhara
- Departement of Biology, Faculty of Science and Technology, Airlangga University, Surabaya 60115, Indonesia; (A.G.); (F.N.F.); (F.I.A.); (A.Y.S.); (N.H.W.); (Y.S.W.M.); (L.M.B.)
- Biotechnology of Tropical Medicinal Plants Research Group, Airlangga University, Surabaya 60115, Indonesia
| | - Le Minh Bui
- Departement of Biology, Faculty of Science and Technology, Airlangga University, Surabaya 60115, Indonesia; (A.G.); (F.N.F.); (F.I.A.); (A.Y.S.); (N.H.W.); (Y.S.W.M.); (L.M.B.)
- Department of Biotechnology, NTT Hi-tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City 70000, Vietnam
| | - Sucipto Hariyanto
- Departement of Biology, Faculty of Science and Technology, Airlangga University, Surabaya 60115, Indonesia; (A.G.); (F.N.F.); (F.I.A.); (A.Y.S.); (N.H.W.); (Y.S.W.M.); (L.M.B.)
- Correspondence: (S.H.); (A.T.W.)
| | - Anjar Tri Wibowo
- Departement of Biology, Faculty of Science and Technology, Airlangga University, Surabaya 60115, Indonesia; (A.G.); (F.N.F.); (F.I.A.); (A.Y.S.); (N.H.W.); (Y.S.W.M.); (L.M.B.)
- Biotechnology of Tropical Medicinal Plants Research Group, Airlangga University, Surabaya 60115, Indonesia
- Correspondence: (S.H.); (A.T.W.)
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The Effects of Rhizosphere Inoculation with Pseudomonas mandelii on Formation of Apoplast Barriers, HvPIP2 Aquaporins and Hydraulic Conductance of Barley. Microorganisms 2022; 10:microorganisms10050935. [PMID: 35630379 PMCID: PMC9147626 DOI: 10.3390/microorganisms10050935] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 04/21/2022] [Accepted: 04/26/2022] [Indexed: 11/28/2022] Open
Abstract
Pseudomonas mandelii strain IB-Ki14 has recently been shown to strengthen the apoplastic barriers of salt-stressed plants, which prevents the entry of toxic sodium. It was of interest to find out whether the same effect manifests itself in the absence of salinity and how this affects the hydraulic conductivity of barley plants. Berberine staining confirmed that the bacterial treatment enhanced the deposition of lignin and suberin and formation of Casparian bands in the roots of barley plants. The calculation of hydraulic conductance by relating transpiration to leaf water potential showed that it did not decrease in bacteria-treated plants. We hypothesized that reduced apoplastic conductivity could be compensated by the higher conductivity of the water pathway across the membranes. This assumption was confirmed by the results of the immunolocalization of HvPIP2;5 aquaporins with specific antibodies, showing their increased abundance around the areas of the endodermis and exodermis of bacteria-treated plants. The immunolocalization with antibodies against auxins and abscisic acid revealed elevated levels of these hormones in the roots of plants treated with bacteria. This root accumulation of hormones is likely to be associated with the ability of Pseudomonas mandelii IB-Ki14 to synthesize these hormones. The involvement of abscisic acid in the control of aquaporin abundance and auxins—in the regulation of and formation of apoplast barriers—is discussed.
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The diversity of bacterial endophytes from Iris pseudacorus L. and their plant beneficial traits. CURRENT RESEARCH IN MICROBIAL SCIENCES 2022; 3:100133. [PMID: 35909614 PMCID: PMC9325737 DOI: 10.1016/j.crmicr.2022.100133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
This study reports the diversity of cultivable endophytic bacteria associated with yellow iris (Iris pseudacorus L.) by using 16S rRNA gene analysis and their plant beneficial traits. The 16S rRNA sequence similarities of endophytic bacteria isolated from the leaves and roots of yellow iris showed that the isolates belonged to the genera Staphylococcus, Streptomyces, Variovorax, Pantoea, Paenibacillus, Bacillus, Janthinobacterium, Enterobacter, Brevibacterium, Agrobacterium, Rhizobium, Xanthomonas translucens, and Pseudomonas. The endophytic bacteria Pseudomonas gessardii HRT18, Brevibacterium frigoritolerans HRT8, Streptomyces atratus HRT13, and Bacillus toyonensis HST13 exhibited antimicrobial activity against five plant pathogenic fungi Fusarium, Rhizoctonia, Botrytis, Pythium, and Alternaria. They also demonstrated the capability to produce chitinase, protease, glucanase, lipase, HCN, and indole-3-acetic acid (IAA). Thirteen isolates (46%) produced IAA, and the most active IAA producers were Bacillus cereus, Agrobacterium tumefaciens, Agrobacterium vitis, Bacillus megaterium, and Bacillus aryabhattai. The IAA producing bacterial isolates stimulated root and shoot growth of garden cress. Our findings suggest that medicinal plants could be a promising source for isolating plant-beneficial bacteria that can be used to enhance the growth and protect plants against soil-borne pathogens.
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Endophytic PGPR from Tomato Roots: Isolation, In Vitro Characterization and In Vivo Evaluation of Treated Tomatoes (Solanum lycopersicum L.). Microorganisms 2022; 10:microorganisms10040765. [PMID: 35456815 PMCID: PMC9031218 DOI: 10.3390/microorganisms10040765] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 03/17/2022] [Accepted: 03/29/2022] [Indexed: 12/10/2022] Open
Abstract
Plant-growth-promoting rhizobacteria (PGPR) are soil bacteria colonizing the rhizosphere and the rhizoplane which have an effect on plant growth through multiple chemical compounds. Rhizobacteria with beneficial effects for plants could therefore be used to reduce the dependence on synthetic chemical fertilizers in conventional agriculture. Within this study, 67 endophytic fungi and 49 bacteria were isolated from root samples from 3 different commercial productions: an off-ground tomato production in a greenhouse, an organic production and a conventional production, both in a soil tunnel. Following morphological selection, 12 fungal and 33 bacterial isolates were genetically identified. Thirteen bacterial isolates belonging to nine potential PGPR species were then applied to tomato seedlings established in sterile substrate. The ability of these bacteria to produce indole acetic acid (IAA) and solubilize phosphate was also evaluated. They all were IAA producers and solubilized phosphate. The most interesting strains for growth promotion were found to be the isolates Pseudomonas palleroniana B10, Bacillus subtilis B25, Bacillus aryabhattai B29 and Pseudomonas fluorescens B17. The isolates P. fluorescens B17, B. aryabhattai B29, B. subtilis B18 and Pseudomonas moraviensis B6 also increased root growth. This study proposed a quick protocol for isolating and testing potential endophytic PGPR that should be characterized further for the direct and indirect mechanisms of growth promotion.
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Zhao Y, Guan D, Liu X, Gao GF, Meng F, Liu B, Xing P, Jiang X, Ma M, Cao F, Li L, Li J. Profound Change in Soil Microbial Assembly Process and Co-occurrence Pattern in Co-inoculation of Bradyrhizobium japonicum 5038 and Bacillus aryabhattai MB35-5 on Soybean. Front Microbiol 2022; 13:846359. [PMID: 35369449 PMCID: PMC8972127 DOI: 10.3389/fmicb.2022.846359] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Accepted: 02/18/2022] [Indexed: 12/04/2022] Open
Abstract
Rhizosphere microbial communities are vital for plant growth and soil sustainability; however, the composition of rhizobacterial communities, especially the assembly process and co-occurrence pattern among microbiota after the inoculation of some beneficial bacteria, remains considerably unclear. In this study, we investigated the structure of rhizomicrobial communities, their assembly process, and interactions contrasting when Bradyrhizobium japonicum 5038 and Bacillus aryabhattai MB35-5 are co-inoculated or Bradyrhizobium japonicum 5038 mono-inoculated in black and cinnamon soils of soybean fields. The obtained results indicated that the Chao and Shannon indices were all higher in cinnamon soil than that in black soil. In black soil, the co-inoculation increased the Shannon indices of bacteria comparing with that of the mono-inoculation. In cinnamon soil, the co-inoculation decreased the Chao indices of fungi comparing with that of mono-inoculation. Compared with the mono-inoculation, the interactions of microorganisms of co-inoculation in the co-occurrence pattern increased in complexity, and the nodes and edges of co-inoculation increased by 10.94, 40.18 and 4.82, 16.91% for bacteria and fungi, respectively. The co-inoculation of Bradyrhizobium japonicum 5038 and Bacillus aryabhattai MB35-5 increased the contribution of stochastic processes comparing with Bradyrhizobium japonicum 5038 inoculation in the assembly process of soil microorganisms, and owing to the limitation of species diffusion might restrict the direction of pathogenic microorganism movement. These findings support the feasibility of rebuilding the rhizosphere microbial system via specific microbial strain inoculation and provide evidence that the co-inoculation of Bradyrhizobium japonicum 5038 and Bacillus aryabhattai MB35-5 can be adopted as an excellent compound rhizobia agent resource for the sustainable development of agriculture.
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Affiliation(s)
- Yubin Zhao
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Dawei Guan
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Xu Liu
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
| | - Gui-Feng Gao
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
| | - Fangang Meng
- Soybean Research Institute, Jilin Academy of Agricultural Sciences, Jilin, China
| | - Bingqiang Liu
- Institute of Cereal and Oil Crops, Hebei Academy of Agricultural and Forestry Sciences, Hebei, China
| | - Pengfei Xing
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Xin Jiang
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Mingchao Ma
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Fengming Cao
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Li Li
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Jun Li
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
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Manjunatha BS, Nivetha N, Krishna GK, Elangovan A, Pushkar S, Chandrashekar N, Aggarwal C, Asha AD, Chinnusamy V, Raipuria RK, Watts A, Bandeppa S, Dukare AS, Paul S. Plant growth-promoting rhizobacteria Shewanella putrefaciens and Cronobacter dublinensis enhance drought tolerance of pearl millet by modulating hormones and stress-responsive genes. PHYSIOLOGIA PLANTARUM 2022; 174:e13676. [PMID: 35316540 DOI: 10.1111/ppl.13676] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 02/02/2022] [Accepted: 03/20/2022] [Indexed: 06/14/2023]
Abstract
Drought is a major abiotic stress that affects crop productivity. Endophytic bacteria have been found to alleviate the adverse effects of drought on plants. In the present study, we evaluated the effects of two endophytic bacteria Shewanella putrefaciens strain MCL-1 and Cronobacter dublinensis strain MKS-1 on pearl millet (Pennisetum glaucum (L.) R. Br.) under drought stress conditions. Pearl millet plants were grown under three water levels: field capacity (FC), mild drought stress (MD), and severe drought stress (SD). The effects of inoculation on plant growth, physiological attributes, phytohormone content, and drought stress-responsive genes were assessed. The inoculation of pearl millet seeds with endophytes significantly improved shoot and root dry weight and root architecture of plants grown under FC and drought stress conditions. There was a significant increase in relative water content and proline accumulation in the inoculated plants. Among the phytohormones analyzed, the content of ABA and IAA was significantly higher in endophyte-treated plants under all moisture regimes than in uninoculated plants. C. dublinensis-inoculated plants had higher GA content than uninoculated plants under all moisture regimes. The expression level of genes involved in phytohormone biosynthesis (SbNCED, SbGA20oX, and SbYUC) and coding drought-responsive transcription factors (SbAP2, SbSNAC1 and PgDREB2A) was significantly higher under SD in endophyte-inoculated plants than in uninoculated plants. Thus, these endophytic bacteria presumably enhanced the tolerance of pearl millet to drought stress by modulating root growth, plant hormones, physiology and the expression of genes involved in drought tolerance.
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Affiliation(s)
| | - Nagarajan Nivetha
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | | | - Allimuthu Elangovan
- Division of Plant Physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Suchitra Pushkar
- Division of Plant Physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Narayanappa Chandrashekar
- Division of Crop Improvement, ICAR-Central Institute for Cotton Research, Nagpur, Maharashtra, India
| | - Chetana Aggarwal
- ICAR-National Research Centre on Plant Biotechnology, New Delhi, India
| | - Arambam Devi Asha
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Viswanathan Chinnusamy
- Division of Plant Physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | | | - Anshul Watts
- ICAR-National Research Centre on Plant Biotechnology, New Delhi, India
| | - Sonth Bandeppa
- Division of Soil Science, ICAR-Indian Institute of Rice Research, Hyderabad, India
| | - Ajinath Shridhar Dukare
- Chemical and Biochemical Processing Division, ICAR-Central Institute for Research on Cotton Technology, Mumbai, India
| | - Sangeeta Paul
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
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Dukare A, Mhatre P, Maheshwari HS, Bagul S, Manjunatha BS, Khade Y, Kamble U. Delineation of mechanistic approaches of rhizosphere microorganisms facilitated plant health and resilience under challenging conditions. 3 Biotech 2022; 12:57. [PMID: 35186654 PMCID: PMC8817020 DOI: 10.1007/s13205-022-03115-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 01/12/2022] [Indexed: 12/27/2022] Open
Abstract
Sustainable agriculture demands the balanced use of inorganic, organic, and microbial biofertilizers for enhanced plant productivity and soil fertility. Plant growth-enhancing rhizospheric bacteria can be an excellent biotechnological tool to augment plant productivity in different agricultural setups. We present an overview of microbial mechanisms which directly or indirectly contribute to plant growth, health, and development under highly variable environmental conditions. The rhizosphere microbiomes promote plant growth, suppress pathogens and nematodes, prime plants immunity, and alleviate abiotic stress. The prospective of beneficial rhizobacteria to facilitate plant growth is of primary importance, particularly under abiotic and biotic stresses. Such microbe can promote plant health, tolerate stress, even remediate soil pollutants, and suppress phytopathogens. Providing extra facts and a superior understanding of microbial traits underlying plant growth promotion can stir the development of microbial-based innovative solutions for the betterment of agriculture. Furthermore, the application of novel scientific approaches for facilitating the design of crop-specific microbial biofertilizers is discussed. In this context, we have highlighted the exercise of "multi-omics" methods for assessing the microbiome's impact on plant growth, health, and overall fitness via analyzing biochemical, physiological, and molecular facets. Furthermore, the role of clustered regularly interspaced short palindromic repeats (CRISPR) based genome alteration and nanotechnology for improving the agronomic performance and rhizosphere microbiome is also briefed. In a nutshell, the paper summarizes the recent vital molecular processes that underlie the different beneficial plant-microbe interactions imperative for enhancing plant fitness and resilience under-challenged agriculture.
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Affiliation(s)
- Ajinath Dukare
- ICAR-Central Institute for Research on Cotton Technology (CIRCOT), Mumbai, Maharashtra India
| | - Priyank Mhatre
- ICAR-Central Potato Research Institute (Regional Station), Udhagamandalam, Tamil Nadu India
| | - Hemant S. Maheshwari
- ICAR-Indian Institute of Soybean Research (IISR), Indore, Madhya Pradesh India
- Present Address: Ecophysiology of Plants, Faculty of Science and Engineering, GELIFES-Groningen Institute for Evolutionary Life Sciences, The University of Groningen, Nijenborgh 7, 9747 AG Groningen, The Netherlands
| | - Samadhan Bagul
- ICAR-Directorate of Medicinal and Aromatic Plant Research, Anand, Gujarat India
| | - B. S. Manjunatha
- ICAR-National Institute of Natural Fibre Engineering and Technology, Kolkata, West Bengal India
| | - Yogesh Khade
- ICAR- Directorate of Onion and Garlic Research, Pune, Maharashtra India
| | - Umesh Kamble
- ICAR-Indian Institute of Wheat and Barley Research, Karnal, Haryana India
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50
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Pu R, Wang P, Guo L, Li M, Cui X, Wang C, Liu Y, Yang Y. The remediation effects of microbial organic fertilizer on soil microorganisms after chloropicrin fumigation. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 231:113188. [PMID: 35051756 DOI: 10.1016/j.ecoenv.2022.113188] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 01/05/2022] [Accepted: 01/09/2022] [Indexed: 06/14/2023]
Abstract
Soil fumigation with chloropicrin (CP) is an effective means of overcoming continuous cropping obstacles (CCO) in Panax notoginseng and improving its yield and quality. CP fumigation can change the microbial community of soil. Therefore, a key step after CP fumigation is the rapid restoration of soil microorganisms and the promotion of beneficial microorganism proliferation as the dominant flora. In this study, continuously cropped soil of P. notoginseng was fumigated with CP, and general organic fertilizer (GOF) or microbial organic fertilizer (MOF) was used to restore soil microorganisms after fumigation. Soil physical and chemical properties, soil microorganisms, and quality of P. notoginseng were investigated. The application of MOF and GOF after CP fumigation promoted increases in soil nitrogen (9.88% and 8.21%, respectively), phosphorus (21.39% and 11.57%, respectively), potassium (7.99% and 2.75%, respectively), and the quality of P. notoginseng; it also promoted the accumulation of saponins in the main roots (23.62% and 9.12%, respectively). Application of MOF and GOF can restore the diversity of microorganisms in the soil. MOF increased the relative abundance of the beneficial soil microorganisms Glomeromycota, Mortierellomycota, Humicola and Bacillus, thereby lowering the relative abundance of the harmful Ascomycota and Fusarium relative to GOF. In summary, CP fumigation reduces the diversity of microorganisms in the soil. The addition of organic fertilizer can promote microbial diversity and increase the relative abundance of beneficial species. Moreover, the promotion effect of MOF is better than that of GOF, thereby improving soil fertility and ultimately promoting the quality and yield of P. notoginseng.
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Affiliation(s)
- Rongfeng Pu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
| | - Panpan Wang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
| | - Lanping Guo
- China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Minghua Li
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, Yunnan, China; Yunnan Provincial Key Laboratory of Panax notoginseng, Kunming 650500, China; Key Laboratory of Panax notoginseng Resources Sustainable Development and Utilization of State Administration of Traditional Chinese Medicine, Kunming 650500, China; Kunming Key Laboratory of Sustainable Development and Utilization of Famous-Region Drug, Kunming 650500, China; Sanqi Research Institute of Yunnan Province, Kunming 650500, Yunnan, China
| | - Xiuming Cui
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, Yunnan, China; Yunnan Provincial Key Laboratory of Panax notoginseng, Kunming 650500, China; Key Laboratory of Panax notoginseng Resources Sustainable Development and Utilization of State Administration of Traditional Chinese Medicine, Kunming 650500, China; Kunming Key Laboratory of Sustainable Development and Utilization of Famous-Region Drug, Kunming 650500, China; Sanqi Research Institute of Yunnan Province, Kunming 650500, Yunnan, China
| | - Chengxiao Wang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, Yunnan, China; Yunnan Provincial Key Laboratory of Panax notoginseng, Kunming 650500, China; Key Laboratory of Panax notoginseng Resources Sustainable Development and Utilization of State Administration of Traditional Chinese Medicine, Kunming 650500, China; Kunming Key Laboratory of Sustainable Development and Utilization of Famous-Region Drug, Kunming 650500, China; Sanqi Research Institute of Yunnan Province, Kunming 650500, Yunnan, China
| | - Yuan Liu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, Yunnan, China; Yunnan Provincial Key Laboratory of Panax notoginseng, Kunming 650500, China; Key Laboratory of Panax notoginseng Resources Sustainable Development and Utilization of State Administration of Traditional Chinese Medicine, Kunming 650500, China; Kunming Key Laboratory of Sustainable Development and Utilization of Famous-Region Drug, Kunming 650500, China; Sanqi Research Institute of Yunnan Province, Kunming 650500, Yunnan, China.
| | - Ye Yang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, Yunnan, China; Yunnan Provincial Key Laboratory of Panax notoginseng, Kunming 650500, China; Key Laboratory of Panax notoginseng Resources Sustainable Development and Utilization of State Administration of Traditional Chinese Medicine, Kunming 650500, China; Kunming Key Laboratory of Sustainable Development and Utilization of Famous-Region Drug, Kunming 650500, China; Sanqi Research Institute of Yunnan Province, Kunming 650500, Yunnan, China.
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