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Tariq A, Ahmed A. Phosphate solubilization potential of PSB: an advance approach to enhance phosphorous availability for phytostimulation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:56174-56193. [PMID: 39256340 DOI: 10.1007/s11356-024-34934-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Accepted: 09/04/2024] [Indexed: 09/12/2024]
Abstract
Rhizosphere engineering approach is considered a quantum leap in plant sciences. The current study focused on investigating rhizobacterial efficiency to mobilize bioavailable phosphate from insoluble-phosphate source. Four efficient phosphate-solubilizing bacterial isolates, i.e., Pseudomonas songnenensis (GR3), Stutzerimonas stutzeri (HH2), Bacillus bingmayongensis (KH3), and Achromobacter aegrifaciens (MH1) were selected for the current study. Interactions between various physiological parameters and phosphate solubilization efficiency of isolates revealed that glucose significantly facilitated phosphorus solubilization at 37 ℃, with media having pH 7 and 0.5% phosphorous. Additionally, positive correlation among P-solubilization potential, acids produced, and pH was observed. Plant microbe-interaction analysis was performed to evaluate the efficiency of these bacterial isolates on various morpho-physiological responses of Zea mays L. For this purpose, various concentrations of tricalcium phosphate (TCP) (0, 10, 20, 30, 40, and 50 mM) were applied to plants in the presence and absence of bacterial isolates. The results showed that lower phosphate levels (10 and 20 mM) trigger shoot development and improve plant weight and leaf formation whereas higher phosphate concentrations (30 mM and above) stimulated the development of longer root system. The bacterial isolates, KH3 and HH2, were observed as efficient phosphate-solubilizing bacteria (PSB) that positively stimulated various plant growth and biochemical attributes over untreated plants. At lower phosphate levels, substantial increase of 92, 65, and 200% in shoot length, fresh weight, and number of leaves was recorded with bacterial isolate HH2, whereas, at 30 mM TCP, increase of 165% was observed in root length of plants treated with bacterial isolate KH3 compared to control. Similarly, at lower phosphate levels, increment of 57.3, 76.7, and 217% in phosphate, protein, and auxin content was recorded in plants treated with bacterial isolate HH2, and increase of 188.8% in total soluble carbohydrates was observed in plants treated with bacterial isolate KH3 as compared to control. Contrarily, increment in total chlorophyll content was most substantial (207%) by the bacterial isolate KH3 when provided with 30 mM TCP. Hence, the current study reviled that the use of these phosphates (KH3 and HH2)-solubilizing PGPR, as an efficient phytostimulator used for crop production in the replacement of chemical fertilizers, is carcinogenic and deteriorating our eco-system.
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Affiliation(s)
- Aqsa Tariq
- Institute of Botany, University of the Punjab, Quaid-E-Azam Campus, Lahore, 54590, Pakistan
| | - Ambreen Ahmed
- Institute of Botany, University of the Punjab, Quaid-E-Azam Campus, Lahore, 54590, Pakistan.
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Kaur H, Mir RA, Hussain SJ, Prasad B, Kumar P, Aloo BN, Sharma CM, Dubey RC. Prospects of phosphate solubilizing microorganisms in sustainable agriculture. World J Microbiol Biotechnol 2024; 40:291. [PMID: 39105959 DOI: 10.1007/s11274-024-04086-9] [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: 06/03/2024] [Accepted: 07/16/2024] [Indexed: 08/07/2024]
Abstract
Phosphorus (P), an essential macronutrient for various plant processes, is generally a limiting soil component for crop growth and yields. Organic and inorganic types of P are copious in soils, but their phyto-availability is limited as it is present largely in insoluble forms. Although phosphate fertilizers are applied in P-deficit soils, their undue use negatively impacts soil quality and the environment. Moreover, many P fertilizers are lost because of adsorption and fixation mechanisms, further reducing fertilizer efficiencies. The application of phosphate-solubilizing microorganisms (PSMs) is an environmentally friendly, low-budget, and biologically efficient method for sustainable agriculture without causing environmental hazards. These beneficial microorganisms are widely distributed in the rhizosphere and can hydrolyze inorganic and organic insoluble P substances to soluble P forms which are directly assimilated by plants. The present review summarizes and discusses our existing understanding related to various forms and sources of P in soils, the importance and P utilization by plants and microbes,, the diversification of PSMs along with mixed consortia of diverse PSMs including endophytic PSMs, the mechanism of P solubilization, and lastly constraints being faced in terms of production and adoption of PSMs on large scale have also been discussed.
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Affiliation(s)
- Harmanjit Kaur
- Department of Botany, University of Allahabad, Prayagraj, Uttar Pradesh, 211002, India
| | - Rakeeb Ahmad Mir
- Department of Biotechnology, School of Life Sciences, Central University of Kashmir, Ganderbal, Jammu, Kashmir, 191201, India
| | - Sofi Javed Hussain
- Department of Botany, Central University of Kashmir, Ganderbal, Jammu, Kashmir, 191201, India
| | - Bhairav Prasad
- Department of Biotechnology, Chandigarh Group of Colleges, SAS Nagar, Landran, Punjab, 140307, India
| | - Pankaj Kumar
- Department of Botany and Microbiology, School of Life Sciences, H.N.B. Garhwal University (A Central University), Srinagar Garhwal, Uttarakhand, 246174, India.
| | - Becky N Aloo
- Department of Biological Sciences, University of Eldoret, P. O. Box 1125-30100, Eldoret, Kenya
| | - Chandra Mohan Sharma
- Department of Botany and Microbiology, School of Life Sciences, H.N.B. Garhwal University (A Central University), Srinagar Garhwal, Uttarakhand, 246174, India
| | - Ramesh Chandra Dubey
- Department of Botany and Microbiology, Gurukul Kangri Vishwavidyalaya, Haridwar, Uttarakhand, 249404, India
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Bourak K, Oulkhir FE, Maghnia FZ, Massart S, Biskri L, Jijakli MH, Allaoui A. A Comprehensive Approach Combining Short-Chain Polyphosphate and Bacterial Biostimulants for Effective Nutrient Solubilization and Enhanced Wheat Growth. Microorganisms 2024; 12:1423. [PMID: 39065191 PMCID: PMC11279140 DOI: 10.3390/microorganisms12071423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2024] [Revised: 07/04/2024] [Accepted: 07/11/2024] [Indexed: 07/28/2024] Open
Abstract
Phosphorus constitutes a crucial macronutrient for crop growth, yet its availability often limits food production. Efficient phosphorus management is crucial for enhancing crop yields and ensuring food security. This study aimed to enhance the efficiency of a short-chain polyphosphate (PolyP) fertilizer by integrating it with plant growth-promoting bacteria (PGPB) to improve nutrient solubilization and wheat growth. Specifically, the study investigated the effects of various bacterial strains on wheat germination and growth when used in conjunction with PolyP. To achieve this, a greenhouse experiment was conducted in which the wheat rhizosphere was amended with a short-chain PolyP fertilizer. Based on the morphological aspect, eight bacteria, designated P1 to P8, were isolated and further characterized. Plant growth-promoting traits were observed in all bacterial strains, as they presented the ability to produce Indole Acetic Acid (IAA) in significant amounts ranging from 7.5 ± 0.3 µg/mL to 44.1 ± 2 µg/mL, expressed by B. tropicus P4 and P. soyae P1, respectively. They also produced ammonia, hydrogen cyanide (HCN), and siderophores. Their effect against the plant pathogen Fusarium culmorum was also assessed, with P. reinekei P2 demonstrating the highest biocontrol activity as it presented a total inhibitory effect. Additionally, some strains exhibited the ability to solubilize/hydrolyze phosphorus, potassium, and zinc. In vivo, the initial growth potential of wheat seeds indicated that those inoculated with the isolated strains exhibited elevated germination rates and enhanced root growth. Based on their plant growth-promoting traits and performance in the germination assay, three strains were selected for producing the best results, specifically phosphorus hydrolyzation/solubilization, zinc solubilization, IAA production, HCN, and siderophores production. Wheat seeds were inoculated by drenching in a bacterial suspension containing 1010 CFU/mL of log phase culture, and an in planta bioassay was conducted in a growth chamber using three selected strains (Pseudomonas soyae P1, Pseudomonas reinekei P2, and Bacillus tropicus P4), applied either individually or with PolyP on a P-deficient soil (28 mg/kg of P Olsen). Our findings demonstrated that the combination of Pseudomonas soyae P1 and PolyP achieved the highest shoot biomass, averaging 41.99 ± 0.87 g. Notably, applying P. soyae P1 or Bacillus tropicus P4 alone yielded similar results to the use of PolyP alone. At the heading growth stage, the combination of Bacillus tropicus P4 and PolyP significantly increased the Chlorophyll Content Index (CCI) to 37.02 µmol/m2, outperforming both PolyP alone (24.07 µmol/m2) and the control (23.06 µmol/m2). This study presents an innovative approach combining short-chain PolyP with bacterial biostimulants to enhance nutrient availability and plant growth. By identifying and characterizing effective bacterial strains, it offers a sustainable alternative to conventional fertilizers.
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Affiliation(s)
- Kaoutar Bourak
- Microbiology Laboratory, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Benguerir 43150, Morocco; (K.B.)
- Integrated and Urban Plant Pathology Laboratory, Terra Research Center, Gembloux Agro-Bio-Tech, Liege University, 5030 Gembloux, Belgium; (F.Z.M.); (S.M.)
| | - Fatima Ezzahra Oulkhir
- Microbiology Laboratory, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Benguerir 43150, Morocco; (K.B.)
| | - Fatima Zahra Maghnia
- Integrated and Urban Plant Pathology Laboratory, Terra Research Center, Gembloux Agro-Bio-Tech, Liege University, 5030 Gembloux, Belgium; (F.Z.M.); (S.M.)
| | - Sebastien Massart
- Integrated and Urban Plant Pathology Laboratory, Terra Research Center, Gembloux Agro-Bio-Tech, Liege University, 5030 Gembloux, Belgium; (F.Z.M.); (S.M.)
| | - Latefa Biskri
- Microbiology Laboratory, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Benguerir 43150, Morocco; (K.B.)
| | - M. Haissam Jijakli
- Integrated and Urban Plant Pathology Laboratory, Terra Research Center, Gembloux Agro-Bio-Tech, Liege University, 5030 Gembloux, Belgium; (F.Z.M.); (S.M.)
| | - Abdelmounaaim Allaoui
- Microbiology Laboratory, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Benguerir 43150, Morocco; (K.B.)
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Mishra S, Zhang X, Yang X. Plant communication with rhizosphere microbes can be revealed by understanding microbial functional gene composition. Microbiol Res 2024; 284:127726. [PMID: 38643524 DOI: 10.1016/j.micres.2024.127726] [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: 12/30/2023] [Revised: 03/26/2024] [Accepted: 04/12/2024] [Indexed: 04/23/2024]
Abstract
Understanding rhizosphere microbial ecology is necessary to reveal the interplay between plants and associated microbial communities. The significance of rhizosphere-microbial interactions in plant growth promotion, mediated by several key processes such as auxin synthesis, enhanced nutrient uptake, stress alleviation, disease resistance, etc., is unquestionable and well reported in numerous literature. Moreover, rhizosphere research has witnessed tremendous progress due to the integration of the metagenomics approach and further shift in our viewpoint from taxonomic to functional diversity over the past decades. The microbial functional genes corresponding to the beneficial functions provide a solid foundation for the successful establishment of positive plant-microbe interactions. The microbial functional gene composition in the rhizosphere can be regulated by several factors, e.g., the nutritional requirements of plants, soil chemistry, soil nutrient status, pathogen attack, abiotic stresses, etc. Knowing the pattern of functional gene composition in the rhizosphere can shed light on the dynamics of rhizosphere microbial ecology and the strength of cooperation between plants and associated microbes. This knowledge is crucial to realizing how microbial functions respond to unprecedented challenges which are obvious in the Anthropocene. Unraveling how microbes-mediated beneficial functions will change under the influence of several challenges, requires knowledge of the pattern and composition of functional genes corresponding to beneficial functions such as biogeochemical functions (nutrient cycle), plant growth promotion, stress mitigation, etc. Here, we focus on the molecular traits of plant growth-promoting functions delivered by a set of microbial functional genes that can be useful to the emerging field of rhizosphere functional ecology.
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Affiliation(s)
- Sandhya Mishra
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Yunnan 666303, China.
| | - Xianxian Zhang
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Yunnan 666303, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaodong Yang
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Yunnan 666303, China.
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Pang F, Li Q, Solanki MK, Wang Z, Xing YX, Dong DF. Soil phosphorus transformation and plant uptake driven by phosphate-solubilizing microorganisms. Front Microbiol 2024; 15:1383813. [PMID: 38601943 PMCID: PMC11005474 DOI: 10.3389/fmicb.2024.1383813] [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: 02/08/2024] [Accepted: 03/14/2024] [Indexed: 04/12/2024] Open
Abstract
Phosphorus (P) is an important nutrient for plants, and a lack of available P greatly limits plant growth and development. Phosphate-solubilizing microorganisms (PSMs) significantly enhance the ability of plants to absorb and utilize P, which is important for improving plant nutrient turnover and yield. This article summarizes and analyzes how PSMs promote the absorption and utilization of P nutrients by plants from four perspectives: the types and functions of PSMs, phosphate-solubilizing mechanisms, main functional genes, and the impact of complex inoculation of PSMs on plant P acquisition. This article reviews the physiological and molecular mechanisms of phosphorus solubilization and growth promotion by PSMs, with a focus on analyzing the impact of PSMs on soil microbial communities and its interaction with root exudates. In order to better understand the ability of PSMs and their role in soil P transformation and to provide prospects for research on PSMs promoting plant P absorption. PSMs mainly activate insoluble P through the secretion of organic acids, phosphatase production, and mycorrhizal symbiosis, mycorrhizal symbiosis indirectly activates P via carbon exchange. PSMs can secrete organic acids and produce phosphatase, which plays a crucial role in soil P cycling, and related genes are involved in regulating the P-solubilization ability. This article reviews the mechanisms by which microorganisms promote plant uptake of soil P, which is of great significance for a deeper understanding of PSM-mediated soil P cycling, plant P uptake and utilization, and for improving the efficiency of P utilization in agriculture.
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Affiliation(s)
- Fei Pang
- College of Agriculture, Guangxi University, Nanning, China
| | - Qing Li
- College of Agriculture, Guangxi University, Nanning, China
- Guangxi Key Laboratory of Agricultural Resources Chemistry and Biotechnology, Smart Agricultural College, Yulin Normal University, Yulin, China
| | - Manoj Kumar Solanki
- Department of Life Sciences and Biological Sciences, IES University, Bhopal, India
| | - Zhen Wang
- Guangxi Key Laboratory of Agricultural Resources Chemistry and Biotechnology, Smart Agricultural College, Yulin Normal University, Yulin, China
| | - Yong-Xiu Xing
- College of Agriculture, Guangxi University, Nanning, China
| | - Deng-Feng Dong
- College of Agriculture, Guangxi University, Nanning, China
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Hathurusinghe SHK, Azizoglu U, Shin JH. Holistic Approaches to Plant Stress Alleviation: A Comprehensive Review of the Role of Organic Compounds and Beneficial Bacteria in Promoting Growth and Health. PLANTS (BASEL, SWITZERLAND) 2024; 13:695. [PMID: 38475541 DOI: 10.3390/plants13050695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 02/06/2024] [Accepted: 02/27/2024] [Indexed: 03/14/2024]
Abstract
Plants select microorganisms from the surrounding bulk soil, which act as a reservoir of microbial diversity and enrich a rhizosphere microbiome that helps in growth and stress alleviation. Plants use organic compounds that are released through root exudates to shape the rhizosphere microbiome. These organic compounds are of various spectrums and technically gear the interplay between plants and the microbial world. Although plants naturally produce organic compounds that influence the microbial world, numerous efforts have been made to boost the efficiency of the microbiome through the addition of organic compounds. Despite further crucial investigations, synergistic effects from organic compounds and beneficial bacteria combinations have been reported. In this review, we examine the relationship between organic compounds and beneficial bacteria in determining plant growth and biotic and abiotic stress alleviation. We investigate the molecular mechanism and biochemical responses of bacteria to organic compounds, and we discuss the plant growth modifications and stress alleviation done with the help of beneficial bacteria. We then exhibit the synergistic effects of both components to highlight future research directions to dwell on how microbial engineering and metagenomic approaches could be utilized to enhance the use of beneficial microbes and organic compounds.
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Affiliation(s)
| | - Ugur Azizoglu
- Department of Crop and Animal Production, Safiye Cikrikcioglu Vocational College, Kayseri University, Kayseri 38039, Turkey
- Genome and Stem Cell Research Center, Erciyes University, Kayseri 38039, Turkey
| | - Jae-Ho Shin
- Department of Applied Biosciences, Kyungpook National University, Daegu 41566, Republic of Korea
- Department of Integrative Biology, Kyungpook National University, Daegu 41566, Republic of Korea
- NGS Core Facility, Kyungpook National University, Daegu 41566, Republic of Korea
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Teles EAP, Xavier JF, Arcênio FS, Amaya RL, Gonçalves JVS, Rouws LFM, Zonta E, Coelho IS. Characterization and evaluation of potential halotolerant phosphate solubilizing bacteria from Salicornia fruticosa rhizosphere. FRONTIERS IN PLANT SCIENCE 2024; 14:1324056. [PMID: 38293620 PMCID: PMC10825674 DOI: 10.3389/fpls.2023.1324056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Accepted: 12/20/2023] [Indexed: 02/01/2024]
Abstract
Soil salinization is a significant abiotic factor threatening agricultural production, while the low availability of phosphorus (P) in plants is another worldwide limitation. Approximately 95-99% of the P in soil is unavailable to plants. Phosphate-solubilizing bacteria (PSB) transform insoluble phosphates into soluble forms that plants can utilize. The application of PSB can replace or partially reduce the use of P fertilizers. Therefore, selecting bacteria with high solubilization capacity from extreme environments, such as saline soils, becomes crucial. This study aimed to identify twenty-nine bacterial strains from the rhizosphere of Salicornia fruticosa by sequencing the 16S rDNA gene, evaluate their development in increasing concentrations of NaCl, classify them according to their salinity response, and determine their P solubilization capability. The bacteria were cultivated in nutrient agar medium with NaCl concentrations ranging from 0.5% to 30%. The phosphate solubilization capacity of the bacteria was evaluated in angar and broth National Botanical Research Institute (NBRIP) media supplemented with calcium phosphate (CaHPO4) and aluminum phosphate (AlPO4), and increased with 3% NaCl. All bacterial strains were classified as halotolerant and identified to the genera Bacillus, Enterobacter, Halomonas, Kushneria, Oceanobacillus, Pantoea, Pseudomonas, and Staphylococcus, with only one isolate was not identified. The isolates with the highest ability to solubilize phosphorus from CaHPO4 in the liquid medium were Kushneria sp. (SS102) and Enterobacter sp. (SS186), with 989.53 and 956.37 mg·Kg-1 P content and final pH of 4.1 and 3.9, respectively. For the solubilization of AlPO4, the most effective isolates were Bacillus sp. (SS89) and Oceanobacillus sp. (SS94), which raised soluble P by 61.10 and 45.82 mg·Kg-1 and final pH of 2.9 and 3.6, respectively. These bacteria demonstrated promising results in in vitro P solubilization and can present potential for the development of bioinput. Further analyses, involving different phosphate sources and the composition of produced organic acids, will be conducted to contribute to a comprehensive understanding of their applications in sustainable agriculture.
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Affiliation(s)
- E. A. P. Teles
- Laboratory of Molecular Genetics of Microorganisms, Department of Veterinary Microbiology and Immunology, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropedica, Brazil
| | - J. F. Xavier
- Laboratory of Molecular Genetics of Microorganisms, Department of Veterinary Microbiology and Immunology, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropedica, Brazil
| | - F. S. Arcênio
- Laboratory of Molecular Genetics of Microorganisms, Department of Veterinary Microbiology and Immunology, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropedica, Brazil
| | - R. L. Amaya
- Laboratory of Molecular Genetics of Microorganisms, Department of Veterinary Microbiology and Immunology, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropedica, Brazil
| | - J. V. S. Gonçalves
- Laboratory of Molecular Genetics of Microorganisms, Department of Veterinary Microbiology and Immunology, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropedica, Brazil
| | | | - E. Zonta
- Laboratory of Soil-Plant Relationship, Department of Soils, Institute of Agronomy, UFRRJ, Seropedica, Brazil
| | - I. S. Coelho
- Laboratory of Molecular Genetics of Microorganisms, Department of Veterinary Microbiology and Immunology, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropedica, Brazil
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Pan L, Cai B. Phosphate-Solubilizing Bacteria: Advances in Their Physiology, Molecular Mechanisms and Microbial Community Effects. Microorganisms 2023; 11:2904. [PMID: 38138048 PMCID: PMC10745930 DOI: 10.3390/microorganisms11122904] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 11/29/2023] [Accepted: 11/29/2023] [Indexed: 12/24/2023] Open
Abstract
Phosphorus is an essential nutrient for all life on earth and has a major impact on plant growth and crop yield. The forms of phosphorus that can be directly absorbed and utilized by plants are mainly HPO42- and H2PO4-, which are known as usable phosphorus. At present, the total phosphorus content of soils worldwide is 400-1000 mg/kg, of which only 1.00-2.50% is plant-available, which seriously affects the growth of plants and the development of agriculture, resulting in a high level of total phosphorus in soils and a scarcity of available phosphorus. Traditional methods of applying phosphorus fertilizer cannot address phosphorus deficiency problems; they harm the environment and the ore material is a nonrenewable natural resource. Therefore, it is imperative to find alternative environmentally compatible and economically viable strategies to address phosphorus scarcity. Phosphorus-solubilizing bacteria (PSB) can convert insoluble phosphorus in the soil into usable phosphorus that can be directly absorbed by plants, thus improving the uptake and utilization of phosphorus by plants. However, there is no clear and systematic report on the mechanism of action of PSB. Therefore, this paper summarizes the discovery process, species, and distribution of PSB, focusing on the physiological mechanisms outlining the processes of acidolysis, enzymolysis, chelation and complexation reactions of PSB. The related genes regulating PSB acidolysis and enzymatic action as well as genes related to phosphate transport and the molecular direction mechanism of its pathway are examined. The effects of PSB on the structure and abundance of microbial communities in soil are also described, illustrating the mechanism of how PSB interact with microorganisms in soil and indirectly increase the amount of available phosphorus in soil. And three perspectives are considered in further exploring the PSB mechanism in utilizing a synergistic multi-omics approach, exploring PSB-related regulatory genes in different phosphorus levels and investigating the application of PSB as a microbial fungicide. This paper aims to provide theoretical support for improving the utilization of soil insoluble phosphorus and providing optimal management of elemental phosphorus in the future.
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Affiliation(s)
- Lin Pan
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education & Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region, Key Laboratory of Molecular Biology, College of Heilongjiang Province, School of Life Sciences, Heilongjiang University, Harbin 150080, China;
| | - Baiyan Cai
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education & Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region, Key Laboratory of Molecular Biology, College of Heilongjiang Province, School of Life Sciences, Heilongjiang University, Harbin 150080, China;
- Hebei Key Laboratory of Agroecological Safety, Hebei University of Environmental Engineering, Qinhuangdao 066102, China
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Javaid S, Mushtaq S, Mumtaz MZ, Rasool G, Naqqash T, Afzal M, Mushtaq U, Ali HM, Akhtar MFUZ, Abbas G, Li L. Mineral Solubilizing Rhizobacterial Strains Mediated Biostimulation of Rhodes Grass Seedlings. Microorganisms 2023; 11:2543. [PMID: 37894201 PMCID: PMC10609362 DOI: 10.3390/microorganisms11102543] [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: 08/31/2023] [Revised: 10/05/2023] [Accepted: 10/06/2023] [Indexed: 10/29/2023] Open
Abstract
Minerals play a dynamic role in plant growth and development. However, most of these mineral nutrients are unavailable to plants due to their presence in fixed forms, which causes significant losses in crop production. An effective strategy to overcome this challenge is using mineral solubilizing bacteria, which can convert insoluble forms of minerals into soluble ones that plants can quickly assimilate, thus enhancing their availability in nutrient-depleted soils. The main objective of the present study was to isolate and characterize mineral solubilizing rhizobacteria and to assess their plant growth-promoting potential for Rhodes grass. Twenty-five rhizobacterial strains were isolated on a nutrient agar medium. They were characterized for solubilization of insoluble minerals (phosphate, potassium, zinc, and manganese), indole acetic acid production, enzymatic activities, and various morphological traits. The selected strains were also evaluated for their potential to promote the growth of Rhodes grass seedlings. Among tested strains, eight strains demonstrated strong qualitative and quantitative solubilization of insoluble phosphate. Strain MS2 reported the highest phosphate solubilization index, phosphate solubilization efficiency, available phosphorus concentration, and reduction in medium pH. Among tested strains, 75% were positive for zinc and manganese solubilization, and 37.5% were positive for potassium solubilization. Strain MS2 demonstrated the highest quantitative manganese solubilization, while strains MS7 and SM4 reported the highest solubilization of zinc and potassium through acidifying their respective media. The strain SM4 demonstrated the most increased IAA production in the presence and absence of L-tryptophan. The majority of strains were positive for various enzymes, including urease, catalase protease, and amylase activities. However, these strains were negative for coagulase activity except strains SM7 and MS7. Based on 16S rRNA gene sequencing, six strains, namely, SM2, SM4, SM5, MS1, MS2, and MS4, were identified as Bacillus cereus, while strains SM7 and MS7 were identified as Staphylococcus saprophyticus and Staphylococcus haemolyticus. These strains significantly improved growth attributes of Rhodes grass, such as root length, shoot length, and root and shoot fresh and dry biomasses compared to the uninoculated control group. The present study highlights the significance of mineral solubilizing and enzyme-producing rhizobacterial strains as potential bioinoculants to enhance Rhodes grass growth under mineral-deficient conditions sustainably.
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Affiliation(s)
- Shaista Javaid
- Institute of Molecular Biology and Biotechnology, The University of Lahore Main Campus, Lahore 54000, Pakistan
| | - Saira Mushtaq
- Institute of Molecular Biology and Biotechnology, The University of Lahore Main Campus, Lahore 54000, Pakistan
| | - Muhammad Zahid Mumtaz
- Institute of Molecular Biology and Biotechnology, The University of Lahore Main Campus, Lahore 54000, Pakistan
| | - Ghulam Rasool
- Institute of Molecular Biology and Biotechnology, The University of Lahore Main Campus, Lahore 54000, Pakistan
| | - Tahir Naqqash
- Institute of Molecular Biology and Biotechnology, Bahauddin Zakariya University, Multan 60800, Pakistan
| | - Maha Afzal
- Institute of Molecular Biology and Biotechnology, The University of Lahore Main Campus, Lahore 54000, Pakistan
| | - Uzma Mushtaq
- Institute of Molecular Biology and Biotechnology, The University of Lahore Main Campus, Lahore 54000, Pakistan
| | - Hayssam M. Ali
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;
| | | | - Ghulam Abbas
- Centre for Climate Research and Development, COMSATS University Islamabad, Islamabad 45550, Pakistan
| | - Lingling Li
- College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China;
- State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China
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Jung H, Lee D, Lee S, Kong HJ, Park J, Seo YS. Comparative genomic analysis of Chryseobacterium species: deep insights into plant-growth-promoting and halotolerant capacities. Microb Genom 2023; 9:001108. [PMID: 37796250 PMCID: PMC10634447 DOI: 10.1099/mgen.0.001108] [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: 05/08/2023] [Accepted: 09/17/2023] [Indexed: 10/06/2023] Open
Abstract
Members of the genus Chryseobacterium have attracted great interest as beneficial bacteria that can promote plant growth and biocontrol. Given the recent risks of climate change, it is important to develop tolerance strategies for efficient applications of plant-beneficial bacteria in saline environments. However, the genetic determinants of plant-growth-promoting and halotolerance effects in Chryseobacterium have not yet been investigated at the genomic level. Here, a comparative genomic analysis was conducted with seven Chryseobacterium species. Phylogenetic and phylogenomic analyses revealed niche-specific evolutionary distances between soil and freshwater Chryseobacterium species, consistent with differences in genomic statistics, indicating that the freshwater bacteria have smaller genome sizes and fewer genes than the soil bacteria. Phosphorus- and zinc-cycling genes (required for nutrient acquisition in plants) were universally present in all species, whereas nitrification and sulphite reduction genes (required for nitrogen- and sulphur-cycling, respectively) were distributed only in soil bacteria. A pan-genome containing 6842 gene clusters was constructed, which reflected the general features of the core, accessory and unique genomes. Halotolerant species with an accessory genome shared a Kdp potassium transporter and biosynthetic pathways for branched-chain amino acids and the carotenoid lycopene, which are associated with countermeasures against salt stress. Protein-protein interaction network analysis was used to define the genetic determinants of Chryseobacterium salivictor NBC122 that reduce salt damage in bacteria and plants. Sixteen hub genes comprised the aromatic compound degradation and Por secretion systems, which are required to cope with complex stresses associated with saline environments. Horizontal gene transfer and CRISPR-Cas analyses indicated that C. salivictor NBC122 underwent more evolutionary events when interacting with different environments. These findings provide deep insights into genomic adaptation to dynamic interactions between plant-growth-promoting Chryseobacterium and salt stress.
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Affiliation(s)
- Hyejung Jung
- Department of Integrated Biological Science, Pusan National University, Busan 46241, South Korea
- Biotechnology Research Division, National Institute of Fisheries Science, Busan 46083, South Korea
| | - Duyoung Lee
- Department of Integrated Biological Science, Pusan National University, Busan 46241, South Korea
| | - Seungchul Lee
- Department of Integrated Biological Science, Pusan National University, Busan 46241, South Korea
| | - Hee Jeong Kong
- Biotechnology Research Division, National Institute of Fisheries Science, Busan 46083, South Korea
| | - Jungwook Park
- Department of Integrated Biological Science, Pusan National University, Busan 46241, South Korea
- Biotechnology Research Division, National Institute of Fisheries Science, Busan 46083, South Korea
| | - Young-Su Seo
- Department of Integrated Biological Science, Pusan National University, Busan 46241, South Korea
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11
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Tauro TP, Nezomba H, Mtambanengwe F, Mapfumo P. Increasing phosphorus rate alters microbial dynamics and soil available P in a Lixisol of Zimbabwe. PLoS One 2023; 18:e0291226. [PMID: 37682930 PMCID: PMC10490935 DOI: 10.1371/journal.pone.0291226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 08/24/2023] [Indexed: 09/10/2023] Open
Abstract
Soil phosphorus (P) deficiency is a major challenge to food security in most parts of sub-Saharan Africa, including Zimbabwe, where farmers largely depend on local organic nutrient resources as fertilizer in the production of crops. Soil microorganisms can contribute to synchronous availability of soil P to plants through regulating immobilization and mineralization cycles of soil P pools but their activity may be influenced by antecedent soil P, P fertilizer application regimes and P uptake by plants. Using soils collected from plots where Crotalaria juncea (high quality), Calliandra calothyrsus (medium quality), cattle manure (variable quality), maize stover and Pinus patula sawdust (both low quality) were applied at the rate of 4 t C ha-1 with 16 kg P ha-1 at the start of every season over 16 seasons. A pot study was conducted to evaluate the influence of increasing inorganic P fertilizer rates (26 and 36 kg P ha-1) on soil microbial dynamics, soil P pools, and maize P uptake. Results indicated that nineteen (19) fungal and forty-two (42) bacterial colonies were identified over the study period. Fungi dominated bacteria on day one, with Aspergillus niger showing a 30-98% abundance that depends on organic resource quality. Overall, microbial diversity peaked activity characterized succession on day 29, which coincided with a significant (P<0.05) increase in P availability. Increasing P rate to 26 kg P ha-1 amplified the microbial diverse peak activity under medium-high quality resources while under the control the peak emerged earlier on day 15. Mucor and Bacillus had peak abundances on day 43 and 57, respectively, across treatments regardless of P rates. Treatment and P rate had a significant (P<0.01) effect on microbial P. Bacteria were more responsive to added P than fungi. Increasing P to 36 kg P ha-1 also stimulated an earlier microbial diverse peak activity under maize stover on day 15. Addition of P alone, without supplying complementary nutrients such as N, did not have a positive effect on maize P uptake. Farmers need to co-apply medium-high quality organic resources with high fertilizer P rates to increase microbial diversity, plant available P and maize growth on sandy soils (Lixisols). Our results suggest that there is a need to reconsider existing P fertilizer recommendations, currently pegged at between 26 and 30 kg P ha-1, for maize production on sandy soils as well as develop new fertilizer formulations to intensify crop production in Zimbabwe.
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Affiliation(s)
- Tonny P. Tauro
- Department of Soil Science & Environment, University of Zimbabwe, Harare, Zimbabwe
- Department of Natural Resources Management, Marondera University of Agricultural Sciences & Technology, Marondera, Zimbabwe
| | - Hatirarami Nezomba
- Department of Soil Science & Environment, University of Zimbabwe, Harare, Zimbabwe
| | | | - Paul Mapfumo
- Department of Soil Science & Environment, University of Zimbabwe, Harare, Zimbabwe
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12
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Oleńska E, Małek W, Wójcik M, Szopa S, Swiecicka I, Aleksandrowicz O, Włostowski T, Zawadzka W, Sillen WMA, Vangronsveld J, Cholakova I, Langill T, Thijs S. Bacteria associated with Zn-hyperaccumulators Arabidopsis halleri and Arabidopsis arenosa from Zn-Pb-Cd waste heaps in Poland as promising tools for bioremediation. Sci Rep 2023; 13:12606. [PMID: 37537323 PMCID: PMC10400580 DOI: 10.1038/s41598-023-39852-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 08/01/2023] [Indexed: 08/05/2023] Open
Abstract
To identify metal adapted bacteria equipped with traits positively influencing the growth of two hyperaccumulator plant species Arabidopsis arenosa and Arabidopsis halleri, we isolated bacteria inhabiting rhizosphere and vegetative tissues (roots, basal and stem leaves) of plants growing on two old Zn-Pb-Cd waste heaps in Bolesław and Bukowno (S. Poland), and characterized their potential plant growth promoting (PGP) traits as well as determined metal concentrations in rhizosphere and plant tissues. To determine taxonomic position of 144 bacterial isolates, 16S rDNA Sanger sequencing was used. A metabolic characterization of isolated strains was performed in vitro using PGP tests. A. arenosa and A. halleri accumulate high amounts of Zn in their tissues, especially in stem leaves. Among in total 22 identified bacterial taxa, the highest level of the taxonomical diversity (H' = 2.01) was revealed in A. halleri basal leaf endophytes originating from Bukowno waste heap area. The 96, 98, 99, and 98% of investigated strains showed tolerant to Cd, Zn, Pb and Cu, respectively. Generally, higher percentages of bacteria could synthesize auxins, siderophores, and acetoin as well as could solubilize phosphate. Nine of waste heap origin bacterial strains were tolerant to toxic metals, showed in vitro PGP traits and are potential candidates for bioremediation.
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Affiliation(s)
- Ewa Oleńska
- Faculty of Biology, University of Bialystok, 1J Ciołkowski, 15-245, Bialystok, Poland.
| | - Wanda Małek
- Faculty of Biology and Biotechnology, Institute of Biological Sciences, Maria Curie-Skłodowska University, 19 Akademicka, 20-033, Lublin, Poland
| | - Małgorzata Wójcik
- Faculty of Biology and Biotechnology, Institute of Biological Sciences, Maria Curie-Skłodowska University, 19 Akademicka, 20-033, Lublin, Poland
| | - Sebastian Szopa
- SHIM-POL A.M. Borzymowski, 5 Lubomirski, 05-080, Izabelin, Poland
| | - Izabela Swiecicka
- Faculty of Biology, University of Bialystok, 1J Ciołkowski, 15-245, Bialystok, Poland
- Laboratory of Applied Microbiology, University of Bialystok, 1J Ciołkowski, 15-245, Bialystok, Poland
| | | | - Tadeusz Włostowski
- Faculty of Biology, University of Bialystok, 1J Ciołkowski, 15-245, Bialystok, Poland
| | - Weronika Zawadzka
- Faculty of Biology, University of Bialystok, 1J Ciołkowski, 15-245, Bialystok, Poland
| | - Wouter M A Sillen
- Faculty of Environmental Biology, Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, 3590, Diepenbeek, Belgium
| | - Jaco Vangronsveld
- Faculty of Biology and Biotechnology, Institute of Biological Sciences, Maria Curie-Skłodowska University, 19 Akademicka, 20-033, Lublin, Poland
- Faculty of Environmental Biology, Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, 3590, Diepenbeek, Belgium
| | - Iva Cholakova
- Faculty of Environmental Biology, Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, 3590, Diepenbeek, Belgium
| | - Tori Langill
- Faculty of Environmental Biology, Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, 3590, Diepenbeek, Belgium
| | - Sofie Thijs
- Faculty of Environmental Biology, Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, 3590, Diepenbeek, Belgium
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Marghoob MU, Nawaz A, Ahmad M, Waheed MQ, Khan MH, Imtiaz M, Islam EU, Imran A, Mubeen F. Assessment of halotolerant bacterial and fungal consortia for augmentation of wheat in saline soils. Front Microbiol 2023; 14:1207784. [PMID: 37455747 PMCID: PMC10347533 DOI: 10.3389/fmicb.2023.1207784] [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: 04/18/2023] [Accepted: 06/09/2023] [Indexed: 07/18/2023] Open
Abstract
Adaptations of green technologies to counter abiotic stress, including salinity for crops like wheat by using halotolerant microbes, is a promising approach. The current study investigated 17 salt-affected agroecological zones from the Punjab and Sindh provinces of Pakistan to explore the potential of indigenous microbial flora, with their multiple biochemical characteristics in addition to plant growth promoting (PGP) traits, for enhanced wheat production in saline areas. Initially, 297 isolated pure bacterial colonies were screened for salt tolerance, biochemical, and PGP traits. Three bacterial strains belonging to Pantoea spp. and Erwinia rhaphontici with possession of multiple characteristics were selected for the development of the halotolerant bacterial consortium. Inoculation of two local wheat varieties, Faisalabad 2008 and Galaxy 2013, with the consortium for in vitro seed germination assay and sand microcosm experiments exhibited significant improvement of selected plant growth parameters like germination percentage and root structure. Two previously reported PGP fungal strains of Trichoderma harzianum and T. viridae were also used as fungal consortium separately for pot experiments and field trials. The pot experiments exhibited a positive correlation of consortia with metabolic viz. catalase, peroxidase, and proline and agronomical parameters including shoot length, dry weight, number of spikes, spike length, and 100 grain weight. To evaluate their performance under natural environmental conditions, field trials were conducted at three salt-affected sites. Agronomical attributes including days of flowering and maturity, flag leaf weight, length and width, shoot length, number of spikes, spike length, spike weight, number of seeds spike-1, 1,000 grain weight, and plot yield indicated the efficiency of these microbes to enhance wheat growth. Concisely, the bacterial consortium showed better performance and Faisalabad 2008 was a more resistant variety as compared to Galaxy 2013. Initial promising results indicate that further extensive research on indigenous microbes might lead to the development of Pakistan's first saline-specific biofertilizers and sustainable eco-friendly agriculture practices.
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Affiliation(s)
- Muhammad Usama Marghoob
- Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering, Constituent College of Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Islamabad, Pakistan
| | - Aniqa Nawaz
- Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering, Constituent College of Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Islamabad, Pakistan
| | - Muhammad Ahmad
- Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering, Constituent College of Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Islamabad, Pakistan
| | - Muhammad Qandeel Waheed
- Plant Breeding and Genetic Division, Nuclear Institute for Agriculture and Biology (NIAB), Faisalabad, Pakistan
| | - Muhammad Hassaan Khan
- Department of Bioinformatics and Biotechnology, Government College University Faisalabad (GCUF), Faisalabad, Pakistan
| | - Muhammad Imtiaz
- Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering, Constituent College of Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Islamabad, Pakistan
| | - Ejaz ul Islam
- Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering, Constituent College of Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Islamabad, Pakistan
| | - Asma Imran
- Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering, Constituent College of Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Islamabad, Pakistan
| | - Fathia Mubeen
- Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering, Constituent College of Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Islamabad, Pakistan
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Landa-Acuña D, Toro M, Santos-Mendoza R, Zúñiga-Dávila D. Role of Rahnella aquatilis AZO16M2 in Phosphate Solubilization and Ex Vitro Acclimatization of Musa acuminata var. Valery. Microorganisms 2023; 11:1596. [PMID: 37375098 PMCID: PMC10301868 DOI: 10.3390/microorganisms11061596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 06/04/2023] [Accepted: 06/09/2023] [Indexed: 06/29/2023] Open
Abstract
Rahnella aquatilis AZO16M2, was characterized for its phosphate solubilization capacity to improve the establishment and survival of Musa acuminata var. Valery seedlings under ex-acclimation. Three phosphorus sources (Rock Phosphate (RF), Ca3(PO4)2 and K2HPO4) and two types of substrate (sand:vermiculite (1:1) and Premix N°8) were selected. The factorial analysis of variance (p < 0.05) showed that R. aquatilis AZO16M2 (OQ256130) solubilizes Ca3(PO4)2 in solid medium, with a Solubilization Index (SI) of 3.77 at 28 °C (pH 6.8). In liquid medium, it was observed that R. aquatilis produced 29.6 mg/L soluble P (pH 4.4), and synthesized organic acids (oxalic, D-gluconic, 2-ketogluconic and malic), Indole Acetic Acid (IAA) (33.90 ppm) and siderophores (+). Additionally, acid and alkaline phosphatases (2.59 and 2.56 µg pNP/mL/min) were detected. The presence of the pyrroloquinoline-quinone (PQQ) cofactor gene was confirmed. After inoculating AZO16M2 to M. acuminata in sand:vermiculite with RF, the chlorophyll content was 42.38 SPAD (Soil Plant Analysis Development). Aerial fresh weight (AFW), aerial dry weight (ADW) and root dry weight (RDW) were superior to the control by 64.15%, 60.53% and 43.48%, respectively. In Premix N°8 with RF and R. aquatilis, 8.91% longer roots were obtained, with 35.58% and 18.76% more AFW and RFW compared with the control as well as 94.45 SPAD. With Ca3(PO4)2, values exceeded the control by 14.15% RFW, with 45.45 SPAD. Rahnella aquatilis AZO16M2 favored the ex-climatization of M. acuminata through improving seedling establishment and survival.
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Affiliation(s)
- Daniela Landa-Acuña
- Laboratorio de Ecología Microbiana y Biotecnología, Departamento de Biología, Facultad de Ciencias, Universidad Nacional Agraria La Molina, Lima 15024, Peru; (D.L.-A.); (R.S.-M.)
| | - Marcia Toro
- Laboratorio de Ecología Microbiana y Biotecnología, Departamento de Biología, Facultad de Ciencias, Universidad Nacional Agraria La Molina, Lima 15024, Peru; (D.L.-A.); (R.S.-M.)
- Centro de Ecología Aplicada, Instituto de Zoología y Ecología Tropical, Facultad de Ciencias, Universidad Central de Venezuela, Caracas 1041-A, Venezuela
| | - Ricardo Santos-Mendoza
- Laboratorio de Ecología Microbiana y Biotecnología, Departamento de Biología, Facultad de Ciencias, Universidad Nacional Agraria La Molina, Lima 15024, Peru; (D.L.-A.); (R.S.-M.)
| | - Doris Zúñiga-Dávila
- Laboratorio de Ecología Microbiana y Biotecnología, Departamento de Biología, Facultad de Ciencias, Universidad Nacional Agraria La Molina, Lima 15024, Peru; (D.L.-A.); (R.S.-M.)
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Gupta S, Pandey S, Kotra V, Kumar A. Assessing the role of ACC deaminase-producing bacteria in alleviating salinity stress and enhancing zinc uptake in plants by altering the root architecture of French bean (Phaseolus vulgaris) plants. PLANTA 2023; 258:3. [PMID: 37212904 DOI: 10.1007/s00425-023-04159-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Accepted: 05/14/2023] [Indexed: 05/23/2023]
Abstract
MAIN CONCLUSION The consortium inoculation with strains R1 and R4 modified the root system to boost seedling growth, increase the zinc content of French bean pods, and reduce salinity stress. The present study demonstrated the effect of two 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase-producing plant growth-promoting rhizobacteria (Pantoea agglomerans R1 and Pseudomonas fragi R4) alone and consortia on the root system development, French bean growth, and zinc content as well as salinity stress tolerance. Both the strains were characterized for ACC utilization activity (426.23 and 380.54 nmol α-ketobutyrate mg protein-1 h-1), indole acetic acid (IAA) production, phosphate solubilization, ammonia, hydrogen cyanide (HCN), and siderophore production. The strains exhibited zinc solubilization in both plate and broth assays with zinc oxide and zinc carbonate as zinc sources as validated by atomic absorption spectroscopy (AAS). Single or combined inoculations with the selected strains significantly modulated the architectural and morphological traits of the root system of French bean plants. Furthermore, the application of R1and R4 consortia has enhanced zinc content in roots (60.83 mg kg-1), shoots (15.41 mg kg-1), and pods (30.04 mg kg-1) of French bean plants grown in ZnCO3 amended soil. In another set of pot experiments, the consortium bacterization has significantly enhanced length as well as fresh and dry biomass of roots and shoots of the French bean plant under saline stress conditions. Additionally, inoculation with ACC-degrading rhizobacterial strains has increased chlorophyll and carotenoid contents, osmoprotectant content, and antioxidative enzyme (catalase and peroxidase) activity in comparison to their counterparts exposed to salt treatments only. Current findings suggested ACC deaminase-producing rhizobacterial strains hold the potential to improve root architecture which in turn promotes plant growth under salt-stressed conditions as well as enhances micronutrient concentration in host plants.
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Affiliation(s)
- Shikha Gupta
- Amity Institute of Organic Agriculture, Amity University Uttar Pradesh, Noida, Uttar Pradesh, 201313, India
| | - Sangeeta Pandey
- Amity Institute of Organic Agriculture, Amity University Uttar Pradesh, Noida, Uttar Pradesh, 201313, India.
| | - Vashista Kotra
- Amity Institute of Organic Agriculture, Amity University Uttar Pradesh, Noida, Uttar Pradesh, 201313, India
| | - Atul Kumar
- Division of Seed Science and Technology, ICAR, Indian Agricultural Research Institute, Pusa, New Delhi, 110012, India
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Joshi S, Gangola S, Jaggi V, Sahgal M. Functional characterization and molecular fingerprinting of potential phosphate solubilizing bacterial candidates from Shisham rhizosphere. Sci Rep 2023; 13:7003. [PMID: 37117212 PMCID: PMC10147649 DOI: 10.1038/s41598-023-33217-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Accepted: 04/10/2023] [Indexed: 04/30/2023] Open
Abstract
Phosphate solubilizing bacteria (PSB) are important role players in plant growth promotion. In the present study, we aimed to screen the functionally active phosphate solubilizing bacteria (PSB) associated with Dalbergia sissoo Roxb. (Shisham) from different provenances. Screening for phosphate solubilization was done on Pikovskaya's agar, and 18 bacteria positive for the tri-calcium phosphate (Ca3(PO4)2 solubilization showing visible dissolution halo zones were identified. All 18 isolates showed zinc solubilization, indole acetic acid (IAA), siderophore, and hydrogen cyanide (HCN) production. The morphological and biochemical characterization with 16S rDNA gene-based phylogenetic analysis identified bacterial strains as belonging to the genus Pseudomonas, Klebsiella, Streptomyces, Pantoea, Kitasatospora, Micrococcus, and Staphylococcus. Among all the isolates, one of the isolates named L4, from Lacchiwala region was the most efficient P solubilizer with a high P solubilization index (4.75 ± 0.06) and quantitative P solubilization activity (891.38 ± 18.55 μg mL-1). The validation of phosphate solubilization activity of PSB isolates was done by amplification of the Pyrroloquinoline quinone (PQQ) genes, pqqA and pqqC. Based on this study, we have selected the bacterial strains which are efficient phosphate solubilizers and could be economical and eco-friendly in plant growth promotion, disease suppression, as an antioxidant, and for subsequent enhancement of yield.
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Affiliation(s)
- Samiksha Joshi
- School of Agriculture, Graphic Era Hill University, Bhimtal, 263136, India
| | - Saurabh Gangola
- School of Agriculture, Graphic Era Hill University, Bhimtal, 263136, India
| | - Vandana Jaggi
- Department of Microbiology, GB Pant University of Agriculture and Technology, Pantnagar, 263145, India
| | - Manvika Sahgal
- Department of Microbiology, GB Pant University of Agriculture and Technology, Pantnagar, 263145, India.
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17
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Dasila H, Sah VK, Jaggi V, Kumar A, Tewari L, Taj G, Chaturvedi S, Perveen K, Bukhari NA, Siang TC, Sahgal M. Cold-tolerant phosphate-solubilizing Pseudomonas strains promote wheat growth and yield by improving soil phosphorous (P) nutrition status. Front Microbiol 2023; 14:1135693. [PMID: 37025630 PMCID: PMC10072159 DOI: 10.3389/fmicb.2023.1135693] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2023] [Accepted: 02/09/2023] [Indexed: 03/16/2023] Open
Abstract
It is well-known that phosphate-solubilizing bacteria (PSB) promote crop growth and yield. The information regarding characterization of PSB isolated from agroforestry systems and their impact on wheat crops under field conditions is rarely known. In the present study, we aim to develop psychrotroph-based P biofertilizers, and for that, four PSB strains (Pseudomonas sp. L3, Pseudomonas sp. P2, Streptomyces sp. T3, and Streptococcus sp. T4) previously isolated from three different agroforestry zones and already screened for wheat growth under pot trial conditions were evaluated on wheat crop under field conditions. Two field experiments were employed; set 1 includes PSB + recommended dose of fertilizers (RDF) and set 2 includes PSB – RDF. In both field experiments, the response of the PSB-treated wheat crop was significantly higher compared to the uninoculated control. In field set 1, an increase of 22% in grain yield (GY), 16% in biological yield (BY), and 10% in grain per spike (GPS) was observed in consortia (CNS, L3 + P2) treatment, followed by L3 and P2 treatments. Inoculation of PSB mitigates soil P deficiency as it positively influences soil alkaline phosphatase (AP) and soil acid phosphatase (AcP) activity which positively correlated with grain NPK %. The highest grain NPK % was reported in CNS-treated wheat with RDF (N–0.26%, P–0.18%, and K-1.66%) and without RDF (N-0.27, P-0.26, and K-1.46%), respectively. All parameters, including soil enzyme activities, plant agronomic data, and yield data were analyzed by principal component analysis (PCA), resulting in the selection of two PSB strains. The conditions for optimal P solubilization, in L3 (temperature-18.46, pH–5.2, and glucose concentration–0.8%) and P2 (temperature-17°C, pH–5.0, and glucose concentration–0.89%), were obtained through response surface methodology (RSM) modeling. The P solubilizing potential of selected strains at <20°C makes them a suitable candidate for the development of psychrotroph-based P biofertilizers. Low-temperature P solubilization of the PSB strains from agroforestry systems makes them potential biofertilizers for winter crops.
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Affiliation(s)
- Hemant Dasila
- Department of Microbiology, Akal College of Basic Sciences, Eternal University, Rajgarh, Himachal Pradesh, India
- Department of Microbiology, College of Basic Sciences and Humanities, G.B. Pant University of Agriculture and Technology, Pantnagar, India
| | - V. K. Sah
- Department of Agronomy, College of Agriculture, G.B. Pant University of Agriculture and Technology, Pantnagar, India
| | - Vandana Jaggi
- Department of Pediatrics and Human Development, Michigan State University, Grand Rapids, MI, United States
| | - Arun Kumar
- Department of Agronomy, Dr. Khem Singh Gill, Akal College of Agriculture, Eternal University, Rajgarh, Himachal Pradesh, India
| | - Lakshmi Tewari
- Department of Microbiology, College of Basic Sciences and Humanities, G.B. Pant University of Agriculture and Technology, Pantnagar, India
| | - Gohar Taj
- Department of Molecular Biology and Biotechnology, College of Basic Sciences and Humanities, G.B. Pant University of Agriculture and Technology, Pantnagar, India
| | - Sumit Chaturvedi
- Department of Agronomy, College of Agriculture, G.B. Pant University of Agriculture and Technology, Pantnagar, India
| | - Kahkashan Perveen
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Najat A. Bukhari
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Tan Ching Siang
- School of Pharmacy, KPJ Healthcare University College, Nilai, Malaysia
- Tan Ching Siang
| | - Manvika Sahgal
- Department of Microbiology, College of Basic Sciences and Humanities, G.B. Pant University of Agriculture and Technology, Pantnagar, India
- *Correspondence: Manvika Sahgal
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18
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Tan Z, Yang X, Gao J, Li Y, Gong B. The mechanism of phosphate solubilizing of Pseudomonas sp. TC952 and its solubilizing process on TC removal. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:26234-26243. [PMID: 36355237 DOI: 10.1007/s11356-022-23847-3] [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: 06/14/2022] [Accepted: 10/23/2022] [Indexed: 06/16/2023]
Abstract
Antibiotics undergo a series of complex transport and transformation route after entering the environment; however, there is scarce information about the effects of the bacterial phosphate-solubilizing process on tetracycline (TC) transformation. In this study, Pseudomonas sp. TC952 was identified as phosphate-solubilizing bacterium with high phosphate-solubilizing ability even under TC stress; it could solubilize maximum phosphate with a production of 400 mg/L soluble phosphate in 2 days. TC did not affect phosphate solubilizing in a short time incubation, but slightly promoted in a long incubation time. TC was adsorbed by inorganic phosphate with high efficiency of 53.09% within 1 day. Four tetracycline antibiotic resistance and sixteen inorganic phosphate-solubilizing-related genes were identified in the genome, which revealed the phosphate-solubilizing mechanism was that strain TC952 secrete organic acid to resolve inorganic phosphate and also secrete siderophore to chelate inorganic phosphate. So, during the inorganic phosphate-solubilizing process of strain TC952, TC was de-adsorbed from inorganic phosphate, and the solution was acidified into pH 4.3 through secreting organic acid to dissolve inorganic phosphorus, which resulted in Ca2+ and PO43- releasing into the solution. Finally, the acidic condition and PO43- enhanced TC hydrolysis. The mechanism of phosphate-solubilizing process on TC removal and genome analysis provides us new insight of the TC migration and transformation route in the environment.
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Affiliation(s)
- Zewen Tan
- College of Natural Resources and Environment, Joint Institute for Environment & Education, South China Agricultural University, Guangzhou, 510642, People's Republic of China
| | - Xiuyue Yang
- College of Natural Resources and Environment, Joint Institute for Environment & Education, South China Agricultural University, Guangzhou, 510642, People's Republic of China
| | - Jianpeng Gao
- College of Natural Resources and Environment, Joint Institute for Environment & Education, South China Agricultural University, Guangzhou, 510642, People's Republic of China
| | - Yongtao Li
- College of Natural Resources and Environment, Joint Institute for Environment & Education, South China Agricultural University, Guangzhou, 510642, People's Republic of China
| | - Beini Gong
- College of Natural Resources and Environment, Joint Institute for Environment & Education, South China Agricultural University, Guangzhou, 510642, People's Republic of China.
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Changes in Soil Phosphorus Availability and Microbial Community Structures in Rhizospheres of Oilseed Rapes Induced by Intercropping with White Lupins. Microorganisms 2023; 11:microorganisms11020326. [PMID: 36838291 PMCID: PMC9959241 DOI: 10.3390/microorganisms11020326] [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: 12/24/2022] [Revised: 01/14/2023] [Accepted: 01/25/2023] [Indexed: 01/31/2023] Open
Abstract
Oilseed rape is sensitive to soil phosphorus deficiencies. In contrast, white lupin is widely used as a model plant because it has efficient phosphorus utilization. Therefore, soil fertility and microbial composition in the rhizospheres of oilseed rapes and root exudate metabolites were compared under monocropping and intercropping systems. The main purpose was to explore whether the phosphorus absorption of rapeseed can be promoted by intercropping with white lupine. In comparison with oilseed rape monoculture (RR), the results showed that the contents of soil-available phosphorus, microbial biomass and phosphorus in the rhizospheres of oilseed rapes in the intercropping system (RL) were all higher than those of RR. Meanwhile, in comparison with RR, not only phosphorus-solubilizing bacteria, such as Streptomyces, Actinomadura and Bacillus, but also phosphorus-solubilizing fungi, such as Chaetomium, Aspergillus, Penicillium, were enriched in the rhizospheres of the oilseed rape under the RL system. Moreover, more abundant soil bacterial functions, organic acids and metabolites were also detected in root exudates of the oilseed rapes under the RL system. All of the above results suggest that soil phosphorus availability in the rhizospheres of oilseed rape could be improved by intercropping with white lupin. Additionally, soil phosphorus-solubilizing microorganisms, that are enriched in the rhizospheres of oilseed rapes under RL systems, have an important function in the improvement of phosphorus absorption of rapeseed by intercropping with white lupin.
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Li Q, Yang X, Li J, Li M, Li C, Yao T. In-depth characterization of phytase-producing plant growth promotion bacteria isolated in alpine grassland of Qinghai-Tibetan Plateau. Front Microbiol 2023; 13:1019383. [PMID: 36687657 PMCID: PMC9846362 DOI: 10.3389/fmicb.2022.1019383] [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: 08/15/2022] [Accepted: 11/30/2022] [Indexed: 01/05/2023] Open
Abstract
The use of plant growth promoting bacteria (PGPB) express phytase (myo-inositol hexakisphosphate phosphohydrolase) capable of hydrolyzing inositol phosphate in soil was a sustainable approach to supply available phosphorus (P) to plants. A total of 73 bacterial isolates with extracellular phytase activity were selected from seven dominant grass species rhizosphere in alpine grassland of Qinghai-Tibetan Plateau. Then, the plant growth promoting (PGP) traits of candidate bacteria were screened by qualitative and quantitative methods, including organic/inorganic Phosphorus solubilization (P. solubilization), plant hormones (PHs) production, nitrogen fixation, 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity and antimicrobial activity. Further experiment were conducted to test their growth promoting effect on Lolium perenne L. under P-limitation. Our results indicated that these bacteria as members of phyla Proteobacteria (90.41%) and Actinobacteria (9.59%) were related to 16 different genera. The isolates of Pseudomonas species showed the highest isolates number (36) and average values of phytase activity (0.267 ± 0.012 U mL-1), and showed a multiple of PGP traits, which was a great candidate for PGPBs. In addition, six strains were positive in phytase gene (β-propeller phytase, bpp) amplification, which significantly increased the shoot length, shoot/root fresh weight, root average diameter and root system phytase activity of Lolium perenne L. under P-limitation, and the expression of phytase gene (bppP) in root system were verified by qPCR. Finally, the PHY101 gene encoding phytase from Pseudomonas mandelii GS10-1 was cloned, sequenced, and recombinantly expressed in Escherichia coli. Biochemical characterization demonstrated that the recombinant phytase PHY101 revealed the highest activity at pH 6 and 40°C temperature. In particular, more than 60% of activity was retained at a low temperature of 15°C. This study demonstrates the opportunity for commercialization of the phytase-producing PGPB to developing localized microbial inoculants and engineering rhizobacteria for sustainable use in alpine grasslands.
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Plant Growth Promoting Endophytic Bacteria Bacillus australimaris BLR41 and Enterobacter kobei BLR45 Enhance the Growth of Medicinal Plant Barleria lupulina Lindl. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2022. [DOI: 10.22207/jpam.16.4.32] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
A total of 50 root colonising bacterial endophytes were identified from a medicinal plant in this investigation (Barleria lupulina), and characterized based on morphologically selected isolates, BLR41 were Gram-negative motile, rod-shaped and BLR45 was Gram-positive, rod-shaped, and light yellow in color. The BLR41 isolate was motile and the BLR45 was positive for indole. The strains BLR41 and BLR45 were positive for citrate, amylase, protease, and lipase. Among all the isolates, BLR41 and BLR45 exhibited higher enzymatic test positive in citrate, amylase lipase, and protease. Furthermore, PGP efficacy as maximum production of zinc in BLR41 isolate and phosphate solubilization in BLR45. Solubilization of the highest zinc (2.80 μg/mL) was obtained by the isolate BLR41, followed by BLR23 and then BLR35. The highest level of phosphate (2.60 μg/mL) was recorded with the BLR45, followed by the BLR07 and BLR18. A consortium of bacterial strains performed better results than individual inoculation. The isolate BLR41 and BLR45 were identified as Bacillus australimaris and Enterobacter kobei following the 16S rRNA sequencing. Among all, seed germination was induced by 93% in consortium BLR41+BLR45, compared to control (T1). An increase in the shoot length by 30% was recorded with the treatment of BLR41+BRL45, BLR41 increase (54%), and BLR45 (35%), respectively. On the other hand, the consortium of mixed cultures, BLR41+BLR45, showed an increased fresh and the weight of dry 65% and 58%. The findings of this study indicate that the consortium of B. australimaris BLR41 and E. kobei BLR45 significantly enhances plant growth in the Pot experiment by zinc and phosphate solubilization properties.
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de Moura GGD, de Barros AV, Machado F, da Silva Dambroz CM, Glienke C, Petters-Vandresen DAL, Alves E, Schwan RF, Pasqual M, Dória J. The Friend Within: Endophytic Bacteria as a Tool for Sustainability in Strawberry Crops. Microorganisms 2022; 10:microorganisms10122341. [PMID: 36557594 PMCID: PMC9780916 DOI: 10.3390/microorganisms10122341] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 10/05/2022] [Accepted: 10/21/2022] [Indexed: 11/29/2022] Open
Abstract
Strawberry (Fragaria x ananassa, Duch.) is an important crop worldwide. However, since it is a highly demanding crop in terms of the chemical conditions of the substrate, a large part of strawberry production implies the application of large amounts of fertilizers in the production fields. This practice can cause environmental problems, in addition to increases in the fruit's production costs. In this context, applying plant growth-promoting bacteria in production fields can be an essential strategy, especially thanks to their ability to stimulate plant growth via different mechanisms. Therefore, this study aimed to test in vitro and in vivo the potential of bacteria isolated from strawberry leaves and roots to directly promote plant growth. The isolates were tested in vitro for their ability to produce auxins, solubilize phosphate and fix nitrogen. Isolates selected in vitro were tested on strawberry plants to promote plant growth and increase the accumulation of nitrogen and phosphorus in the leaves. The tested isolates showed an effect on plant growth according to biometric parameters. Among the tested isolates, more expressive results for the studied variables were observed with the inoculation of the isolate MET12M2, belonging to the species Brevibacillus fluminis. In general, bacterial inoculation induced strain-dependent effects on strawberry growth. In vitro and in vivo assays showed the potential use of the B. fluminis MET12M2 isolate as a growth promoter for strawberries.
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Affiliation(s)
| | | | - Franklin Machado
- Phytopathology Department, Federal University of Viçosa, Viçosa 36570-900, Brazil
| | | | - Chirlei Glienke
- Genetic Department, Federal University of Paraná, Curitiba 81531-980, Brazil
| | | | - Eduardo Alves
- Phytopathology Department, Federal University of Lavras, Lavras 37200-900, Brazil
| | | | - Moacir Pasqual
- Agriculture Department, Federal University of Lavras, Lavras 37200-900, Brazil
| | - Joyce Dória
- Agriculture Department, Federal University of Lavras, Lavras 37200-900, Brazil
- Correspondence:
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Ayaz M, Ali Q, Jiang Q, Wang R, Wang Z, Mu G, Khan SA, Khan AR, Manghwar H, Wu H, Gao X, Gu Q. Salt Tolerant Bacillus Strains Improve Plant Growth Traits and Regulation of Phytohormones in Wheat under Salinity Stress. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11202769. [PMID: 36297795 PMCID: PMC9608499 DOI: 10.3390/plants11202769] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 10/09/2022] [Accepted: 10/11/2022] [Indexed: 05/30/2023]
Abstract
Soil salinity is a major constraint adversely affecting agricultural crops including wheat worldwide. The use of plant growth promoting rhizobacteria (PGPR) to alleviate salt stress in crops has attracted the focus of many researchers due to its safe and eco-friendly nature. The current study aimed to study the genetic potential of high halophilic Bacillus strains, isolated from the rhizosphere in the extreme environment of the Qinghai-Tibetan plateau region of China, to reduce salt stress in wheat plants. The genetic analysis of high halophilic strains, NMCN1, LLCG23, and moderate halophilic stain, FZB42, revealed their key genetic features that play an important role in salt stress, osmotic regulation, signal transduction and membrane transport. Consequently, the expression of predicted salt stress-related genes were upregulated in the halophilic strains upon NaCl treatments 10, 16 and 18%, as compared with control. The halophilic strains also induced a stress response in wheat plants through the regulation of lipid peroxidation, abscisic acid and proline in a very efficient manner. Furthermore, NMCN1 and LLCG23 significantly enhanced wheat growth parameters in terms of physiological traits, i.e., fresh weight 31.2% and 29.7%, dry weight 28.6% and 27.3%, shoot length 34.2% and 31.3% and root length 32.4% and 30.2%, respectively, as compared to control plants under high NaCl concentration (200 mmol). The Bacillus strains NMCN1 and LLCG23 efficiently modulated phytohormones, leading to the substantial enhancement of plant tolerance towards salt stress. Therefore, we concluded that NMCN1 and LLCG23 contain a plethora of genetic features enabling them to combat with salt stress, which could be widely used in different bio-formulations to obtain high crop production in saline conditions.
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Affiliation(s)
- Muhammad Ayaz
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
| | - Qurban Ali
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
| | - Qifan Jiang
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
| | - Ruoyi Wang
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
| | - Zhengqi Wang
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
| | - Guangyuan Mu
- Shenzhen Batian Ecological Engineering Co., Ltd., Shenzhen 518057, China
| | - Sabaz Ali Khan
- Biotechnology Department, College of Environmental Sciences, COMSATS, Abbottabad 22060, Pakistan
| | - Abdur Rashid Khan
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
| | - Hakim Manghwar
- Lushan Botanical Garden, Chinese Academy of Sciences, Jiujiang 332000, China
| | - Huijun Wu
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
| | - Xuewen Gao
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
| | - Qin Gu
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
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Rafique E, Mumtaz MZ, Ullah I, Rehman A, Qureshi KA, Kamran M, Rehman MU, Jaremko M, Alenezi MA. Potential of mineral-solubilizing bacteria for physiology and growth promotion of Chenopodium quinoa Willd. FRONTIERS IN PLANT SCIENCE 2022; 13:1004833. [PMID: 36299778 PMCID: PMC9589155 DOI: 10.3389/fpls.2022.1004833] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 09/06/2022] [Indexed: 06/16/2023]
Abstract
Nutrient deficiency in wild plant species, including quinoa (Chenopodium quinoa Willd), can be overcome by applying mineral-solubilizing bacteria. Quinoa is a gluten-free, nutritious food crop with unique protein content. The present study aimed to characterize mineral-solubilizing rhizobacterial strains and to evaluate their plant growth-promoting potential in quinoa seedlings. More than sixty rhizobacterial strains were isolated from the quinoa rhizosphere and found eighteen strains to be strong phosphate solubilizers. Most of these bacterial strains showed zinc solubilization, and more than 80% of strains could solubilize manganese. The selected strains were identified as Bacillus altitudinis Cq-3, Pseudomonas flexibilis Cq-32, Bacillus pumilus Cq-35, Pseudomonas furukawaii Cq-40, Pontibacter lucknowensis Cq-48, and Ensifer sp. Cq-51 through 16S rRNA partial gene sequencing. Mainly, these strains showed the production of organic acids, including malic, gluconic, tartaric, ascorbic, lactic, and oxalic acids in insoluble phosphorus amended broth. All strains showed production of gluconic acids, while half of the strains could produce malic, ascorbic, lactic, and oxalic acids. These strains demonstrated the production of indole-3-acetic acid in the presence as well as in the absence of L-tryptophan. The bacterial strains also demonstrated their ability to promote growth and yield attributes, including shoot length, root length, leave numbers, root and shoot dry biomass, spike length, and spikes numbers of quinoa in pots and field trials. Increased physiological attributes, including relative humidity, quantum flux, diffusive resistance, and transpiration rate, were observed due to inoculation with mineral solubilizing bacterial strains under field conditions. P. lucknowensis Cq-48, followed by P. flexibilis Cq-32, and P. furukawaii Cq-40 showed promising results to promote growth, yield, and physiological attributes. The multi-traits characteristics and plant growth-promoting ability in the tested bacterial strains could provide an opportunity for formulating biofertilizers that could promote wild quinoa growth and physiology.
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Affiliation(s)
- Ejaz Rafique
- Institute of Molecular Biology and Biotechnology, The University of Lahore, Lahore, Pakistan
| | - Muhammad Zahid Mumtaz
- Institute of Molecular Biology and Biotechnology, The University of Lahore, Lahore, Pakistan
| | - Inam Ullah
- Institute of Molecular Biology and Biotechnology, The University of Lahore, Lahore, Pakistan
| | - Aneela Rehman
- Department of Microbiology, Abbottabad University of Science and Technology, Abbottabad, Pakistan
| | - Kamal Ahmad Qureshi
- Department of Pharmaceutics, Unaizah College of Pharmacy, Qassim University, Unaizah, Saudi Arabia
| | - Muhammad Kamran
- School of Agriculture, Food and Wine, The University of Adelaide, Adelaide, SA, Australia
| | - Mujaddad Ur Rehman
- Department of Microbiology, Abbottabad University of Science and Technology, Abbottabad, Pakistan
| | - Mariusz Jaremko
- Smart-Health Initiative (SHI) and Red Sea Research Center (RSRC), Division of Biological and Environmental Sciences and Engineering (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
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Guerra M, Carrasco-Fernández J, Valdés JH, Panichini M, Franco Castro J. Draft genome of Pseudomonas sp. RGM 2987 isolated from Stevia philippiana roots reveals its potential as a plant biostimulant and potentially constitutes a novel species. ELECTRON J BIOTECHN 2022. [DOI: 10.1016/j.ejbt.2022.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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Janati W, Mikou K, El Ghadraoui L, Errachidi F. Isolation and characterization of phosphate solubilizing bacteria naturally colonizing legumes rhizosphere in Morocco. Front Microbiol 2022; 13:958300. [PMID: 36225374 PMCID: PMC9549286 DOI: 10.3389/fmicb.2022.958300] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 08/30/2022] [Indexed: 11/13/2022] Open
Abstract
Low-cost and environmentally friendly agricultural practices have received increasing attention in recent years. Developing microbial inoculants containing phosphate (P) solubilizing bacteria (PSB) represents an emerging biological solution to improve rhizosphere P availability. The present study aims to explore PSB strains isolated from soils located at different bioclimatic stages in Morocco and present in various legumes rhizosphere to improve agronomic microbial fertilizer’s effectiveness. It was also aimed to test the isolated strains for their ability to solubilize P in NBRIP medium with Tricalcium P (Ca3 (PO4)2) (TCP), rock phosphate (RP), and their combination as a source of phosphorus, by (22) experiment design. Bacterial strains with a high P solubility index (PSI) were selected, characterized, and compared to commercial control. The vanadate-molybdate method was used to estimate P solubilization activity. Stress tolerance to salinity, acidity, drought, and temperature was tested. From all isolated strains (64), 12 were screened as promising biotechnological interest because of their P solubilization and their good resistance to different drastic conditions. Besides, the strain WJEF15 showed the most P solubility efficiency in NBRIP solid medium with a PSI of 4.1; while the WJEF61 strain was located as the most efficient strain in NBRIP-TCP liquid medium by releasing 147.62 mg.l–1 of soluble P. In contrast, in the NBRIP-RP medium, the strain WJEF15 presented maximum solubilization with 25.16 mg.l–1. The experiment design showed that a combination of RP and TCP with max level progressively increases P solubilization by 20.58%, while the WJEF63 strain has the most efficient concentration of 102.69 mg.l–1. Indeed, among the selected strains, four strains were able to limit tested fungi growth. Thus, results reveal a potential effect of selecting PSBs to support cropping cultures as plant growth-promoting rhizobacteria (PGPR).
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Mahdi I, Allaoui A, Fahsi N, Biskri L. Bacillus velezensis QA2 Potentially Induced Salt Stress Tolerance and Enhanced Phosphate Uptake in Quinoa Plants. Microorganisms 2022; 10:microorganisms10091836. [PMID: 36144437 PMCID: PMC9505587 DOI: 10.3390/microorganisms10091836] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Revised: 09/08/2022] [Accepted: 09/08/2022] [Indexed: 11/16/2022] Open
Abstract
Plant Growth-Promoting Rhizobacteria (PGPR) have attracted much attention in agriculture biotechnology as biological inputs to sustain crop production. The present study describes a halotolerant phosphate solubilizing bacterium associated with quinoa plant roots. Based on a metabolic screening, one bacterial isolate, named QA2, was selected and screened for PGPR traits. This isolate solubilized both inorganic phosphate and zinc, produced indole-3-acetic acid, ammonia, hydrogen cyanide, cellulase, and (to be deleted) protease, and induced biofilm formation. We demonstrated that QA2 exhibited both antimicrobial and ion metabolism activities and tolerated high salt concentration at up to 11% NaCl. Genotyping analyses, using 16S rRNA and chaperonin cpn60 genes, revealed that QA2 belongs to the species of Bacillus velezensis. Using the quinoa model cultivated under a saline condition, we demonstrated that QA2 promoted plant growth and mitigated the saline irrigation effects. Analysis of harvested plants revealed that QA2 induced a significant increase of both leaf chlorophyll index by 120.86% (p < 0.05) and P uptake by 41.17% (p < 0.05), while the content of Na+ was drastically decreased. Lastly, a bibliometric data analysis highlighted the panoramic view of studies carried out so far on B. velezensis strains. Our investigation presents a holistic view of the potential application of B. velezensis as a biological inoculant to promote plant growth, control pathogen attacks, and mitigate the salinity effect of quinoa plants. Further investigations are still needed to demonstrate these effects in field conditions.
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Affiliation(s)
- Ismail Mahdi
- Microbiology Laboratory, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Ben Guerir 43150, Morocco
| | - Abdelmounaaim Allaoui
- Microbiology Laboratory, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Ben Guerir 43150, Morocco
| | - Nidal Fahsi
- Microbiology Laboratory, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Ben Guerir 43150, Morocco
| | - Latefa Biskri
- Microbiology Laboratory, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Ben Guerir 43150, Morocco
- African Genome Center (AGC), Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Ben Guerir 43150, Morocco
- Correspondence: ; Tel.: +212-52502926
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Mataranyika PN, Chimwamurombe PM, Venturi V, Uzabakiriho JD. Bacterial bioinoculants adapted for sustainable plant health and soil fertility enhancement in Namibia. FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 2022. [DOI: 10.3389/fsufs.2022.1002797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The increase in dryland agriculture elicits the need to develop sustainable practices that improve crop yield and protect soil fertility. The use of biofertilisers adapted to nutrient deficient soils and arid climates would help achieve this. In this review, the use of plant growth-promoting bacteria is explored as a possible solution to the current state of dryland agriculture and climate change threats to agriculture. Plant microbe interactions form the basis of this review as evidence has shown that these interactions often exist to improve the health of plants. This is achieved by the production of important biochemicals and enzymes like indole acetic acid and amino cyclopropane-1-carboxylate deaminase while also actively protecting plants from pathogens including fungal pathogens. Research, therefore, has shown that these plant-growth promoting bacteria may be exploited and developed into biofertilisers. These biofertilisers are both economically and environmentally sustainable while improving soil quality and crop yield. The literature presented in this review is in context of the Namibian climate and soil profiles.
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Jin F, Hu Q, Zhao Y, Lin X, Zhang J, Zhang J. Enhancing quinoa growth under severe saline-alkali stress by phosphate solubilizing microorganism Penicillium funicuiosum P1. PLoS One 2022; 17:e0273459. [PMID: 36067185 PMCID: PMC9447905 DOI: 10.1371/journal.pone.0273459] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 08/08/2022] [Indexed: 11/22/2022] Open
Abstract
Promoting the growth of plants and improving plant stress-resistance by plant growth-promoting microorganism increasingly become a hotpot. While, most researchers focus on their supply role of nutrition or plant hormone. In this study, a novel mechanism that phosphate solubilizing microorganisms promoted plant growth under saline-alkali stress through secretion of organic acids, was proposed. The effects of desulfurization gypsum, humic acid, organic fertilizer and phosphate-solubilizing microorganism Penicillium funicuiosum P1 (KX400570) on the growth of quinoa (Chenopodium quinoa cv. Longli 1), showed that the survival rate, stem length and dry weight of quinoa treated with P1 were 2.5, 1.5, 1 and 1.5 times higher than those of sterile water (CK) under severe saline-alkali stress. The growth-promoting effect of P1 on quinoa was much better than that of other treatment groups. In addition, P1 promoted the growth of quinoa because the organic acids (malic acid, citric acid, succinic acid, etc.) from P1 stimulated the antioxidant system and promote the photosynthesis of quinoa, further promote quinoa growth.
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Affiliation(s)
- Fengyuan Jin
- College of Life Sciences, Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
| | - Qilin Hu
- College of Life Sciences, Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
| | - Yingxu Zhao
- College of Life Sciences, Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
| | - Xiaoyu Lin
- College of Life Sciences, Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
| | - Jianfeng Zhang
- College of Life Sciences, Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
| | - Jiejing Zhang
- College of Life Sciences, Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
- * E-mail:
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Sagnon A, Iwasaki S, Tibiri EB, Zongo NA, Compaore E, Bonkoungou IJO, Nakamura S, Traore M, Barro N, Tiendrebeogo F, Sarr PS. Amendment with Burkina Faso phosphate rock-enriched composts alters soil chemical properties and microbial structure, and enhances sorghum agronomic performance. Sci Rep 2022; 12:13945. [PMID: 35978091 PMCID: PMC9386011 DOI: 10.1038/s41598-022-18318-1] [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: 03/18/2022] [Accepted: 08/09/2022] [Indexed: 11/16/2022] Open
Abstract
Low soil available phosphorus (P) severely limits crop production in sub-Saharan Africa. The present study evaluated phosphate rock-enriched composts as locally available low-cost fertilizers for sorghum production. The treatments consisted of sorghum straw, compost (COMP), phosphate rock (BPR), BPR-enriched compost (P-COMP), BPR-rhizosphere soil-enriched compost (P-COMP-SOIL), nitrogen-phosphorus-potassium treatment (NPK, 60–39–25), and control (NK, 60–25). Sorghum straw and compost were applied at 1.34 tons ha−1. N, P, and K in all treatments, excluding the control, were adjusted to 60, 39, and 25 kg ha−1, with urea, BPR, and KCl, respectively. Sorghum vr. kapelga was cultivated and soil samples were collected at the S5, S8, and S9 growth stages. P-COMP-SOIL and NPK yielded better sorghum yields than the other treatments. The rhizosphere soil of P-COMP-SOIL had high abundance of soil bacteria and AMF, and genes involved in P solubilization, such as: acid phosphatase (aphA), phosphonatase (phnX), glucose dehydrogenase (gcd), pyrroloquinoline quinone (pqqE), phosphate-specific transporter (pstS). The superior performance of the P-COMP-SOIL was associated with its higher available P content and microbial abundance. Multivariate analysis also revealed vital contributions of N, carbon, and exchangeable cations to sorghum growth. Soils could be amended with phosphate rock-rhizosphere soil-enriched composts, as an alternative to chemical fertilizers.
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Affiliation(s)
- Adama Sagnon
- Laboratory of Molecular Biology, Epidemiology and Monitoring of Bacteria and Virus Transmitted by Food (LaBESTA), University Joseph KI-ZERBO, 03 BP 7021, Ouagadougou 03, Burkina Faso.,Laboratory of Virology and Plant Biotechnology, Institute of Environment and Agricultural Research (INERA), 01 BP 476, Ouagadougou 01, Burkina Faso
| | - Shinya Iwasaki
- Rural Development Division, Japan International Research Center for Agricultural Sciences, Tsukuba, 305-8686, Japan
| | - Ezechiel Bionimian Tibiri
- Laboratory of Virology and Plant Biotechnology, Institute of Environment and Agricultural Research (INERA), 01 BP 476, Ouagadougou 01, Burkina Faso
| | - Nongma Armel Zongo
- Department of Natural Resources Management and Production Systems, Institute of Environment and Agricultural Research (INERA), 01 BP 476, Ouagadougou 01, Burkina Faso
| | - Emmanuel Compaore
- Department of Natural Resources Management and Production Systems, Institute of Environment and Agricultural Research (INERA), 01 BP 476, Ouagadougou 01, Burkina Faso
| | - Isidore Juste O Bonkoungou
- Laboratory of Molecular Biology, Epidemiology and Monitoring of Bacteria and Virus Transmitted by Food (LaBESTA), University Joseph KI-ZERBO, 03 BP 7021, Ouagadougou 03, Burkina Faso
| | - Satoshi Nakamura
- Crop, Livestock and Environment Division, Japan International Research Center for Agricultural Sciences, Tsukuba, 305-8686, Japan
| | - Mamoudou Traore
- Department of Natural Resources Management and Production Systems, Institute of Environment and Agricultural Research (INERA), 01 BP 476, Ouagadougou 01, Burkina Faso
| | - Nicolas Barro
- Laboratory of Molecular Biology, Epidemiology and Monitoring of Bacteria and Virus Transmitted by Food (LaBESTA), University Joseph KI-ZERBO, 03 BP 7021, Ouagadougou 03, Burkina Faso
| | - Fidele Tiendrebeogo
- Laboratory of Virology and Plant Biotechnology, Institute of Environment and Agricultural Research (INERA), 01 BP 476, Ouagadougou 01, Burkina Faso
| | - Papa Saliou Sarr
- Crop, Livestock and Environment Division, Japan International Research Center for Agricultural Sciences, Tsukuba, 305-8686, Japan.
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31
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Timofeeva A, Galyamova M, Sedykh S. Prospects for Using Phosphate-Solubilizing Microorganisms as Natural Fertilizers in Agriculture. PLANTS 2022; 11:plants11162119. [PMID: 36015422 PMCID: PMC9414882 DOI: 10.3390/plants11162119] [Citation(s) in RCA: 46] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 08/09/2022] [Accepted: 08/11/2022] [Indexed: 11/16/2022]
Abstract
Phosphates are known to be essential for plant growth and development, with phosphorus compounds being involved in various physiological and biochemical reactions. Phosphates are known as one of the most important factors limiting crop yields. The problem of phosphorus deficiency in the soil has traditionally been solved by applying phosphate fertilizers. However, chemical phosphate fertilizers are considered ineffective compared to the organic fertilizers manure and compost. Therefore, increasing the bioavailability of phosphates for plants is one of the primary goals of sustainable agriculture. Phosphate-solubilizing soil microorganisms can make soil-insoluble phosphate bioavailable for plants through solubilization and mineralization. These microorganisms are currently in the focus of interest due to their advantages, such as environmental friendliness, low cost, and high biological efficiency. In this regard, the solubilization of phosphates by soil microorganisms holds strong potential in research, and inoculation of soils or crops with phosphate-solubilizing bacteria is a promising strategy to improve plant phosphate uptake. In this review, we analyze all the species of phosphate-solubilizing bacteria described in the literature to date. We discuss key mechanisms of solubilization of mineral phosphates and mineralization of organic phosphate-containing compounds: organic acids secreted by bacteria for the mobilization of insoluble inorganic phosphates, and the enzymes hydrolyzing phosphorus-containing organic compounds. We demonstrate that phosphate-solubilizing microorganisms have enormous potency as biofertilizers since they increase phosphorus bioavailability for the plant, promote sustainable agriculture, improve soil fertility, and raise crop yields. The use of phosphate-solubilizing microbes is regarded as a new frontier in increasing plant productivity.
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Affiliation(s)
- Anna Timofeeva
- SB RAS Institute of Chemical Biology and Fundamental Medicine, 630090 Novosibirsk, Russia
| | - Maria Galyamova
- Faculty of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Sergey Sedykh
- SB RAS Institute of Chemical Biology and Fundamental Medicine, 630090 Novosibirsk, Russia
- Faculty of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
- Correspondence: ; Tel.: +7-91-3727-1000
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Zhou Z, Chang N, Lv Y, Jiang H, Yao C, Wan X, Li Y, Zhang X. K-solubilizing bacteria (Bacillus) promote theanine synthesis in tea roots (Camellia sinensis) by activating CsTSI activity. TREE PHYSIOLOGY 2022; 42:1613-1627. [PMID: 35271713 DOI: 10.1093/treephys/tpac027] [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: 09/22/2021] [Accepted: 03/06/2022] [Indexed: 06/14/2023]
Abstract
Theanine is an important quality parameter referring to tea quality. Applying nitrogen fertilizers is one strategy to improve the level of theanine; however, the effect of plant growth-promoting rhizobacteria on theanine synthesis in tea roots has been less studied. In this study, the bacteria isolated from Qimen County with the maximum potassium (K) solubilization were identified as Bacillus by biochemical and molecular analyses. We show that tartaric and pyruvic acids produced by Bacillus were important components related to K solubilization in vitro. Pot experiments and enzymatic assays in vitro showed that inoculation with Bacillus-secreted organic acids increased the level of available potassium in the soil. The increased K level activated recombinant CsTSI activity (theanine biosynthesis enzyme) and increased ethylamine content (the synthesis precursor of theanine), resulting in promoted theanine synthesis in tea roots. Therefore, our study indicates that Bacillus can be a potential bioinoculant for biofortification of tea.
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Affiliation(s)
- Ziwen Zhou
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Changjiang West Road Hefei, Anhui 230036, China
| | - Na Chang
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Changjiang West Road Hefei, Anhui 230036, China
| | - Yaning Lv
- Technology Center of Hefei Customs, NO 329 Tunxi Road, Hefei, Anhui 230036, China
| | - Hong Jiang
- Anhui Keemun Black Tea Industry Co., Ltd, Huangshan, Anhui 245600, China
| | - Cheng Yao
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Changjiang West Road Hefei, Anhui 230036, China
| | - Xiaochun Wan
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Changjiang West Road Hefei, Anhui 230036, China
| | - Yeyun Li
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Changjiang West Road Hefei, Anhui 230036, China
| | - Xianchen Zhang
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Changjiang West Road Hefei, Anhui 230036, China
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Screening of multi-faceted phosphate-solubilising bacterium from seagrass meadow and their plant growth promotion under saline stress condition. Microbiol Res 2022; 261:127080. [DOI: 10.1016/j.micres.2022.127080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 05/17/2022] [Accepted: 05/24/2022] [Indexed: 11/19/2022]
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de Paula AF, Cruz FDPN, Dinato NB, de Andrade PHM, de Moraes ACP, Junior WB, Bernardi ACDC, Vigna BBZ, Fávero AP, Lacava PT. Endophytic and rhizospheric bacteria associated with Paspalum atratum and its potential for plant growth promotion with different phosphate sources. FRONTIERS IN PLANT SCIENCE 2022; 13:884716. [PMID: 35968102 PMCID: PMC9365944 DOI: 10.3389/fpls.2022.884716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Accepted: 07/05/2022] [Indexed: 06/15/2023]
Abstract
The genus Paspalum belongs to the family Poaceae and has several species that are native to Brazil. The Paspalum Germplasm Bank (GB) of the Brazilian Agricultural Research Corporation comprises approximately 450 accessions from 50 species. Among these accessions, Paspalum atratum (BGP 308) has economic potential for forage purposes. However, the endophytic and rhizospheric microbial communities within this accession and their ability to promote plant growth remain unknown. The present study aimed to isolate the endophytic and rhizospheric bacteria associated with P. atratum and to assess their potential for plant growth improvement, so-called plant growth-promoting bacteria (PGPB). For the in vitro tests, the ability of nitrogen-fixing bacteria (NFB), phosphate solubilization (PS) and indoleacetic acid (IAA) production were evaluated. A total of 116 endophytic and rhizosphere bacteria were obtained from the isolation. In the in vitro tests, 43 (37.00%) of these isolates showed positive NFB, PS, and IAA results. These isolates were identified by 16S rDNA sequencing. The phosphate solubilization index (PSI) ranged from 2 to 3.61, all 43 strains performed biological nitrogen fixation and the IAA production ranged from 12.85 to 431.41 μg ml-1. Eight of these 43 isolates were evaluated in vivo in a greenhouse using P. atratum caryopsis. The pots were filled with soil prepared with three different phosphate sources and one control without phosphate. After growth, the plants were submitted to morphological, bromatological and chemical determination. Data were analyzed using analysis of variance (ANOVA) and principal component analysis (PCA). In the in vivo test, treatments 105 (Pseudomonas sp.) and 458 (Pseudomonas sp.) were the most significant for the crystalline phosphate source, 109 (Bacillus sp.) for the sedimentary phosphate source and, as for the soluble phosphate source most treatments that received bacterial isolates had higher phosphorus content in the dry matter than the uninoculated soluble phosphate control. The 105FCR (crystalline phosphate + Pseudomonas sp.), 109FSE (sedimentary phosphate + Bacillus sp.), and 110 FSE (sedimentary phosphate + Enterobacter sp.) treatments showed the best results for plant growth promotion. This work made it possible to determine the bacterial community associated with P. atratum (BGP308) and to obtain new potential plant growth-promoting strains.
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Affiliation(s)
- Ailton Ferreira de Paula
- Laboratory of Microbiology and Biomolecules, Department of Morphology and Pathology, Biological and Health Sciences Center, Federal University of São Carlos, São Carlos, Brazil
- Evolutionary Genetics and Molecular Biology Graduate Program, Biological and Health Sciences Center, Federal University of São Carlos, São Carlos, Brazil
| | - Felipe de Paula Nogueira Cruz
- Laboratory of Microbiology and Biomolecules, Department of Morphology and Pathology, Biological and Health Sciences Center, Federal University of São Carlos, São Carlos, Brazil
- Biotechnology Graduate Program, Exact and Technology Sciences Center, Federal University of São Carlos, São Carlos, Brazil
| | - Naiana Barbosa Dinato
- Evolutionary Genetics and Molecular Biology Graduate Program, Biological and Health Sciences Center, Federal University of São Carlos, São Carlos, Brazil
- Embrapa Pecuária Sudeste, São Carlos, Brazil
| | - Paulo Henrique Marques de Andrade
- Laboratory of Microbiology and Biomolecules, Department of Morphology and Pathology, Biological and Health Sciences Center, Federal University of São Carlos, São Carlos, Brazil
- Evolutionary Genetics and Molecular Biology Graduate Program, Biological and Health Sciences Center, Federal University of São Carlos, São Carlos, Brazil
| | - Amanda Carolina Prado de Moraes
- Laboratory of Microbiology and Biomolecules, Department of Morphology and Pathology, Biological and Health Sciences Center, Federal University of São Carlos, São Carlos, Brazil
- Biotechnology Graduate Program, Exact and Technology Sciences Center, Federal University of São Carlos, São Carlos, Brazil
| | | | | | | | - Alessandra Pereira Fávero
- Evolutionary Genetics and Molecular Biology Graduate Program, Biological and Health Sciences Center, Federal University of São Carlos, São Carlos, Brazil
- Embrapa Pecuária Sudeste, São Carlos, Brazil
| | - Paulo Teixeira Lacava
- Laboratory of Microbiology and Biomolecules, Department of Morphology and Pathology, Biological and Health Sciences Center, Federal University of São Carlos, São Carlos, Brazil
- Evolutionary Genetics and Molecular Biology Graduate Program, Biological and Health Sciences Center, Federal University of São Carlos, São Carlos, Brazil
- Biotechnology Graduate Program, Exact and Technology Sciences Center, Federal University of São Carlos, São Carlos, Brazil
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Roslan MAM, Sobri ZM, Zuan ATK, Abdul Rahman NA. Okra Growth, Yield and Rhizosphere Microbiome Responses to the Encapsulated Bioinoculant Application under Reduced Fertilization Regime. BIOLOGY 2022; 11:biology11081107. [PMID: 35892963 PMCID: PMC9332871 DOI: 10.3390/biology11081107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 07/21/2022] [Accepted: 07/22/2022] [Indexed: 11/30/2022]
Abstract
There is limited evidence that Enterobacter hormaechei can improve plant physiology and yield through soil phosphate (P) and potassium (K) amelioration. This study unraveled the effect of different soil inoculation methods i.e., free-cell and encapsulated (alginate bead containing sugar-protein hydrolysate and molasses) E. hormaechei 40a with different rates of PK-fertilization on okra P and K uptake, and soil rhizosphere bacterial community. The results revealed that 3HB (half-dose PK-fertilizer + encapsulated strain 40a) had the highest soil available P (SAP) and K (SAK), as well as P and K uptake for all plant organs, followed by 3F (full-dose PK-fertilizer), 3HI (half-dose PK-fertilizer + free-cell strain 40a), and 3H (half-dose PK-fertilizer), and improved yield by up to 75.6%. Both inoculated and full-dose fertilizer treatments produced larger pods (>15 cm) compared to 3H. We discovered increased bacterial richness and diversity in both 3HB and 3HI samples compared to uninoculated treatments. Both 3HB and 3F treatments were positively correlated with the increasing abundance of Acidobacteriales, Burkholderia caballeronia paraburkholderia, Gemmataceae, and Sphingomonas along with the SAP and SAK. The plant-beneficial effect of one-time 3HB treatment on okra growth and yield was comparable to biweekly inoculation in 3HI, suggesting a new cost-effective farming approach in precision agriculture.
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Affiliation(s)
- Muhamad Aidilfitri Mohamad Roslan
- Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia;
- Correspondence: (M.A.M.R.); (N.A.A.R.)
| | - Zulfazli M. Sobri
- Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia;
| | - Ali Tan Kee Zuan
- Department of Land Management, Faculty of Agriculture, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia;
| | - Nor Aini Abdul Rahman
- Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia;
- Correspondence: (M.A.M.R.); (N.A.A.R.)
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Draft Genome Sequence of Pseudomonas sp. Strain RGM 3321, a Phyllosphere Endophyte from Fragaria chiloensis subsp.
chiloensis
f.
patagonica. Microbiol Resour Announc 2022; 11:e0033522. [PMID: 35731123 PMCID: PMC9302079 DOI: 10.1128/mra.00335-22] [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: 11/20/2022] Open
Abstract
Pseudomonas sp. strain RGM 3321 is a phyllosphere endophyte from Fragaria chiloensis subsp. chiloensis f. patagonica that harbors genes associated with plant growth promotion pathways, as well as genes typically found in plant pathogens.
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Zhao D, Ding Y, Cui Y, Zhang Y, Liu K, Yao L, Han X, Peng Y, Gou J, Du B, Wang C. Isolation and Genome Sequence of a Novel Phosphate-Solubilizing Rhizobacterium Bacillus altitudinis GQYP101 and Its Effects on Rhizosphere Microbial Community Structure and Functional Traits of Corn Seedling. Curr Microbiol 2022; 79:249. [PMID: 35834051 DOI: 10.1007/s00284-022-02944-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 06/20/2022] [Indexed: 11/03/2022]
Abstract
Bacillus altitudinis is a widely distributed soil bacterium that has various functional activities, including remediation of contaminated soil, degradation of herbicides, and enhancement of plant growth. B. altitudinis GQYP101 was isolated from the rhizosphere soil of Lycium barbarum L. and demonstrated potential as a plant growth-promoting bacterium. In this work, strain GQYP101 could solubilize phosphorus, and increased the stem diameter, maximum leaf area, and fresh weight of corn in a pot experiment. Nitrogen and phosphorus contents of corn seedlings (aerial part) increased by 100% and 47.9%, respectively, after application of strain GQYP101. Concurrently, nitrogen and phosphorus contents of corn root also increased, by 55.40% and 20.3%, respectively. Furthermore, rhizosphere soil nutrients were altered and the content of available phosphorus increased by 73.2% after application of strain GQYP101. The mechanism by which strain GQYP101 improved plant growth was further investigated by whole genome sequence analysis. Strain GQYP101 comprises a circular chromosome and a linear plasmid. Some key genes of strain GQYP101 were identified that were related to phosphate solubilization, alkaline phosphatase, chemotaxis, and motility. The findings of this study may provide a theoretical basis for strain GQYP101 to enhance crop yield as microbial fertilizer.
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Affiliation(s)
- Dongying Zhao
- College of Life Sciences and Shandong Engineering Research Center of Plant, Microbia Restoration for Saline-Alkali Land and Shandong Key Laboratory of Agricultural Microbiology and National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shandong Agricultural University, Taian, China
| | - Yanqin Ding
- College of Life Sciences and Shandong Engineering Research Center of Plant, Microbia Restoration for Saline-Alkali Land and Shandong Key Laboratory of Agricultural Microbiology and National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shandong Agricultural University, Taian, China
| | - Yanru Cui
- College of Life Sciences and Shandong Engineering Research Center of Plant, Microbia Restoration for Saline-Alkali Land and Shandong Key Laboratory of Agricultural Microbiology and National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shandong Agricultural University, Taian, China
| | - Yanan Zhang
- College of Life Sciences and Shandong Engineering Research Center of Plant, Microbia Restoration for Saline-Alkali Land and Shandong Key Laboratory of Agricultural Microbiology and National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shandong Agricultural University, Taian, China
| | - Kai Liu
- College of Life Sciences and Shandong Engineering Research Center of Plant, Microbia Restoration for Saline-Alkali Land and Shandong Key Laboratory of Agricultural Microbiology and National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shandong Agricultural University, Taian, China
| | - Liangtong Yao
- College of Life Sciences and Shandong Engineering Research Center of Plant, Microbia Restoration for Saline-Alkali Land and Shandong Key Laboratory of Agricultural Microbiology and National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shandong Agricultural University, Taian, China
| | - Xiaobin Han
- Zunyi Tobacco Monopoly Administration of Guizhou, Zunyi, China
| | - Yulong Peng
- Zunyi Tobacco Monopoly Administration of Guizhou, Zunyi, China
| | - Jianyu Gou
- Zunyi Tobacco Monopoly Administration of Guizhou, Zunyi, China
| | - Binghai Du
- College of Life Sciences and Shandong Engineering Research Center of Plant, Microbia Restoration for Saline-Alkali Land and Shandong Key Laboratory of Agricultural Microbiology and National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shandong Agricultural University, Taian, China
| | - Chengqiang Wang
- College of Life Sciences and Shandong Engineering Research Center of Plant, Microbia Restoration for Saline-Alkali Land and Shandong Key Laboratory of Agricultural Microbiology and National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shandong Agricultural University, Taian, China.
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F. Ajilogba C, Babalola OO, Adebola P, Adeleke R. Bambara Groundnut Rhizobacteria Antimicrobial and Biofertilization Potential. FRONTIERS IN PLANT SCIENCE 2022; 13:854937. [PMID: 35909751 PMCID: PMC9326403 DOI: 10.3389/fpls.2022.854937] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 06/13/2022] [Indexed: 06/15/2023]
Abstract
Bambara groundnut, an underutilized crop has been proved to be an indigenous crop in Africa with the potential for food security. The rhizosphere of Bambara groundnut contains Rhizobacteria, with the ability to grow, adapt, and colonize their surroundings even in unfavorable conditions and have not been explored for their plant growth-promoting properties. The aim of this research was to determine the potential of rhizobacteria from Bambara groundnut soil samples as either biofertilizers or biocontrol agents or both to help provide sustainable agriculture in Africa and globally. Bambara groundnut rhizospheric soil samples were collected and analyzed for their chemical composition. Rhizobacteria isolates were cultured from the soil samples. Plant growth-promoting, antifungal activities and phylogenetic analysis using 16S rRNA were carried out on the isolates to identify the rhizobacteria. A 2-year field study planting was carried out to determine the effect of these rhizobacteria as biofertilizers for Bambara groundnut (Vigna subterranean). The study was carried out in a complete randomized block experimental design with three replications. All the isolates were able to produce ammonia and 1-aminocyclopropane-1-carboxylate, while 4.65, 12.28, and 27.91% produced hydrogen cyanide, indole acetic acid, and solubilized phosphate, respectively, making them important targets as biocontrol and biofertilizer agents. The field results revealed that treatment with rhizobacteria had significant results compared with the control. Characterization of selected isolates reveals their identity as B. amyloliquefaciens, B. thuringiensis, and Bacillus sp. These Bacillus isolates have proved to be plant growth-promoting agents that can be used as biofertilizers to enhance the growth of crops and consequent improved yield. This is the first time the rhizobacteria from the Bambara groundnut rhizosphere are applied as biofertilizer.
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Affiliation(s)
- Caroline F. Ajilogba
- Niche Area for Food Security and Safety, Faculty of Natural and Agricultural Science, North-West University, Mmabatho, South Africa
- Agricultural Research Council-Natural Resources and Engineering, Pretoria, South Africa
| | - Olubukola O. Babalola
- Niche Area for Food Security and Safety, Faculty of Natural and Agricultural Science, North-West University, Mmabatho, South Africa
| | - Patrick Adebola
- Agricultural Research Council-Vegetable and Ornamental Plants, Pretoria, South Africa
- International Institute of Tropical Agriculture, Abuja, Nigeria
| | - Rasheed Adeleke
- Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
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Kaur R, Kaur S. Exploration of phytate-mineralizing bacteria with multifarious plant growth-promoting traits. BIOTECHNOLOGIA 2022; 103:99-112. [PMID: 36606074 PMCID: PMC9642947 DOI: 10.5114/bta.2022.116204] [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: 05/04/2021] [Revised: 11/08/2021] [Accepted: 01/05/2022] [Indexed: 01/07/2023] Open
Abstract
Phytate-mineralizing bacteria (PMB) with plant growth-promoting activity can be considered as a potential biofertilizer for plant nutrition. PMB catalyzes the conversion of insoluble sugar phosphates, inositols, nucleic acids, phospholipids, nucleotides, phytate, and phytin into soluble forms that can be assimilated by plants. The present study aimed to isolate potential PMB from rhizospheric soils and to study their plant growth-promoting potential for the possible development of a potential phosphobacterium biofertilizer. For this purpose, 34 PMB isolates were isolated that showed potent phytate-mineralizing potential. These isolates were tested for their potential to solubilize tricalcium phosphate (TCP) and for various other plant growth-promoting activities. Significant differences were found among the isolates with regard to phytate mineralization and other plant growth-promoting characteristics. The bacterial isolates biochemically identified as Bacillus, Paenibacillus, Arthrobacter, and Burkholderia exhibited high/medium P solubilization, medium/high phytohormone production, and medium/low siderophore and ammonia production. Among all these isolates, isolate A14 (Burkholderia cenocepacia strain FDAARGOS_7) was the promising isolate with high TCP solubilization, medium phytate mineralization, high enzyme production, medium/high phytohormone production, and medium ammonia production. This strain also showed nitrogen fixation activity, zinc solubilizing potential, potassium solubilization, ACC deaminase production, and catalase production. Hence, it can be concluded that B. cenocepacia can be the potential candidate for biofertilizer development. Future studies are planned for exploring the role of PMB in biofertilizer formulations.
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40
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Khourchi S, Elhaissoufi W, Loum M, Ibnyasser A, Haddine M, Ghani R, Barakat A, Zeroual Y, Rchiad Z, Delaplace P, Bargaz A. Phosphate solubilizing bacteria can significantly contribute to enhance P availability from polyphosphates and their use efficiency in wheat. Microbiol Res 2022; 262:127094. [PMID: 35749891 DOI: 10.1016/j.micres.2022.127094] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 06/02/2022] [Accepted: 06/10/2022] [Indexed: 11/16/2022]
Abstract
Rhizosphere microbes significantly enhance phosphorus (P) availability from a variety of unavailable P pools in agricultural soils. However, little is known about the contribution of root-associated microorganisms, notably P solubilizing bacteria (PSB), to enhance the use of polyphosphate (PolyP) fertilizers as well as the key mechanisms involved. This study assesses the ability of four PSB (Bacillus siamensis, Rahnella aceris, Pantoea hericii, Bacillus paramycoides) and their consortium (Cs) to enhance the release rate of available P from two types of PolyP ("PolyB" and "PolyC") with a focus on the key role of phosphatase enzyme activities and organic acids production. Wheat growth performance and P acquisition efficiency were evaluated in response to co-application of PSB and PolyP. Results showed that inoculation with PSB, notably Cs, significantly enhanced available P from PolyC, PolyB and tri-calcium P. Increased available P in response to inoculation with PSB significantly correlated with medium acidification, organic acids production (notably glycolic acid) and induced activities of acid phosphatase and pyrophosphatase. In planta, the co-application of PSB-PolyP improved wheat plant biomass, root growth and P acquisition, with best results obtained from Cs-PolyP co-application as compared to uninoculated and unfertilized plants. At seedling stage, the co-application of Cs-PolyP (PolyB and PolyC) enhanced root hairs length (125 % and 131 %), root length (26 % and 37 %) and root inorganic P (Pi) content (160 % and 182 %), respectively compared to uninoculated plants. Similarly, at tillering stage, plant biomass (35 % and 47 %), Pi content (43 % and 253 %), P translocation (215 % and 315 %) and soil phosphatases (213 % and 219 %) significantly improved under PolyB and PolyC application, respectively. Findings from this study demonstrate the key role of PSB to enhance the use of PolyP through production of organic acids and phosphatases, exhibiting differential traits patterns between the two PolyP. Improved wheat growth and root P acquisition in response to PSB-PolyP co-application can be attributed to induced rhizosphere processes leading to enhanced available P taken up by roots.
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Affiliation(s)
- Said Khourchi
- Mohammed VI Polytechnic University - AgroBioSciences - Plant & Soil Microbiome Sub-Program, Laboratory of Plant-Microbe Interactions, Ben Guerir 43150, Morocco; Université of Liège, Gembloux Agro-Bio Tech, Plant Sciences Department, Gembloux B-5030, Belgium.
| | - Wissal Elhaissoufi
- Mohammed VI Polytechnic University - AgroBioSciences - Plant & Soil Microbiome Sub-Program, Laboratory of Plant-Microbe Interactions, Ben Guerir 43150, Morocco; Center of Agrobiotechnology & Bioengineering, Research Unit Labeled CNRST, Faculty of Sciences and Techniques, Cadi Ayyad University, Marrakech 40000, Morocco
| | - Mohamed Loum
- Mohammed VI Polytechnic University - AgroBioSciences - Plant & Soil Microbiome Sub-Program, Laboratory of Plant-Microbe Interactions, Ben Guerir 43150, Morocco
| | - Ammar Ibnyasser
- Mohammed VI Polytechnic University - AgroBioSciences - Plant & Soil Microbiome Sub-Program, Laboratory of Plant-Microbe Interactions, Ben Guerir 43150, Morocco
| | - Meryem Haddine
- Mohammed VI Polytechnic University - AgroBioSciences - Plant & Soil Microbiome Sub-Program, Laboratory of Plant-Microbe Interactions, Ben Guerir 43150, Morocco
| | - Rachid Ghani
- Mohammed VI Polytechnic University - AgroBioSciences - Plant & Soil Microbiome Sub-Program, Laboratory of Plant-Microbe Interactions, Ben Guerir 43150, Morocco
| | - Abdellatif Barakat
- Mohammed VI Polytechnic University - AgroBioSciences - Plant & Soil Microbiome Sub-Program, Laboratory of Plant-Microbe Interactions, Ben Guerir 43150, Morocco; IATE, University of Montpellier, INRAE, Agro Institut, 34060 Montpellier, France
| | - Youssef Zeroual
- Situation Innovation, OCP Group, Jorf Lasfar, 24025 El Jadida, Morocco
| | - Zineb Rchiad
- Mohammed VI Polytechnic University, African Genome Center, Ben Guerir 43150, Morocco
| | - Pierre Delaplace
- Université of Liège, Gembloux Agro-Bio Tech, Plant Sciences Department, Gembloux B-5030, Belgium
| | - Adnane Bargaz
- Mohammed VI Polytechnic University - AgroBioSciences - Plant & Soil Microbiome Sub-Program, Laboratory of Plant-Microbe Interactions, Ben Guerir 43150, Morocco.
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Mishra J, Mishra I, Arora NK. 2,4-Diacetylphloroglucinol producing Pseudomonas fluorescens JM-1 for management of ear rot disease caused by Fusarium moniliforme in Zea mays L. 3 Biotech 2022; 12:138. [PMID: 35646503 DOI: 10.1007/s13205-022-03201-7] [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: 06/07/2021] [Accepted: 03/05/2022] [Indexed: 11/27/2022] Open
Abstract
Maize (Zea mays L.) is a major cereal crop grown in a large number of countries. Loss in maize yield due to biotic stresses including fungal phytopathogens is a matter of immense concern. Control measures applied for eradication of fungal phytopathogens in maize are not up to the mark and more often involve harsh chemical(s)/pesticide(s) that cause deleterious effects both in humans and soil biota. Greener alternatives, such as the use of rhizosphere microbes in the form of bioinoculants, have proven to be very successful in terms of enhancing crop yield and suppressing fungal phytopathogens. In the present study, fluorescent pseudomonads were isolated from the maize rhizosphere and monitored for their plant growth-promoting (PGP) and biocontrol activities against Fusarium moniliforme. Based on various PGP traits and biocontrol potential, isolate JM-1 was found to be most effective and as per 16S rRNA gene sequencing analysis was identified as Pseudomonas fluorescens. Further experiments showed that the biocontrol potential of JM-1 against ear rot fungus involved the production of antifungal compound 2,4-diacetylphloroglucinol (DAPG). When examined for antagonistic interaction under scanning electron microscopy (SEM), structural abnormality, hyphal lysis, and deformity in fungal mycelium were observed. In the pot experiment, application of talc-based JM-1 containing bioformulation (in pot trials) showed significant enhancement in maize growth parameters (including the seed number and weight) in comparison to control even in presence of the phytopathogen. Ear fresh weight, dry weight, number of seeds per plant, and 100-grain weight were found to increase significantly by 34, 34, 52, and 18% respectively, in comparison to control. P. fluorescens JM-1 can therefore be used as a bioinoculant for ear rot disease control and sustainably enhancing maize yield. Supplementary Information The online version contains supplementary material available at 10.1007/s13205-022-03201-7.
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Affiliation(s)
- Jitendra Mishra
- Department of Environmental Science, School of Earth and Environmental Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, UP 226025 India
| | - Isha Mishra
- Department of Environmental Science, School of Earth and Environmental Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, UP 226025 India
| | - Naveen Kumar Arora
- Department of Environmental Science, School of Earth and Environmental Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, UP 226025 India
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Streptomycetaceae and Promicromonosporaceae: Two Actinomycetes Families from Moroccan Oat Soils Enhancing Solubilization of Natural Phosphate. Microorganisms 2022; 10:microorganisms10061116. [PMID: 35744634 PMCID: PMC9230749 DOI: 10.3390/microorganisms10061116] [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] [Received: 04/09/2022] [Revised: 05/21/2022] [Accepted: 05/26/2022] [Indexed: 11/17/2022] Open
Abstract
Soil actinomycetes explorations appear to be an efficient alternative as biofertilizers to optimize the use of phosphorus (P) resources and enhance plant growth. This research aimed to explore the distribution of actinomycetes isolated from four different rhizospheric Moroccan oat soils and to investigate their potential for P solubilization. The distribution of actinomycetes was significantly more abundant in Settat (9.68%), Tangier (7.38%), and Beni Mellal (6.87%) than in the Merchouch-Rabat (4.90%) region. A total of 235 actinomycete strains were isolated from all sites and tested for their ability to grow on a synthetic minimum medium (SMM) containing insoluble natural rock phosphate (RP) or synthetic tricalcium phosphate (TCP) as the unique P source. One hundred forty-three isolates (60.8%) had the ability to grow in the SMM with RP whereas only twenty-five isolates (17%) had the most active growth using the SMM with TCP. Eight isolates with the most active growth in solid SMM were selected for their P solubilization abilities in liquid SMM cultures. The highest amount of P solubilized was 163.8 µg/mL for RP and 110.27 µg/mL for TCP after 5 days of culture. The biosolubilization process of AM2, the most efficient RP and TCP solubilizing strain, probably implied the highest excretion of siderophore substances. Eight of these strains were shown to belong to the Streptomyces genus and one to the Promicromonospora genus. These findings bolster the phosphate biosolubilization abilities of actinomycetes and may participate in increasing agricultural yields in an eco-efficient and environmentally friendly manner.
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Yahya M, Rasul M, Sarwar Y, Suleman M, Tariq M, Hussain SZ, Sajid ZI, Imran A, Amin I, Reitz T, Tarkka MT, Yasmin S. Designing Synergistic Biostimulants Formulation Containing Autochthonous Phosphate-Solubilizing Bacteria for Sustainable Wheat Production. Front Microbiol 2022; 13:889073. [PMID: 35592004 PMCID: PMC9111743 DOI: 10.3389/fmicb.2022.889073] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 04/04/2022] [Indexed: 11/13/2022] Open
Abstract
Applying phosphate-solubilizing bacteria (PSB) as biofertilizers has enormous potential for sustainable agriculture. Despite this, there is still a lack of information regarding the expression of key genes related to phosphate-solubilization (PS) and efficient formulation strategies. In this study, we investigated rock PS by Ochrobactrum sp. SSR (DSM 109610) by relating it to bacterial gene expression and searching for an efficient formulation. The quantitative PCR (qPCR) primers were designed for PS marker genes glucose dehydrogenase (gcd), pyrroloquinoline quinone biosynthesis protein C (pqqC), and phosphatase (pho). The SSR-inoculated soil supplemented with rock phosphate (RP) showed a 6-fold higher expression of pqqC and pho compared to inoculated soil without RP. Additionally, an increase in plant phosphorous (P) (2%), available soil P (4.7%), and alkaline phosphatase (6%) activity was observed in PSB-inoculated plants supplemented with RP. The root architecture improved by SSR, with higher root length, diameter, and volume. Ochrobactrum sp. SSR was further used to design bioformulations with two well-characterized PS, Enterobacter spp. DSM 109592 and DSM 109593, using the four organic amendments, biochar, compost, filter mud (FM), and humic acid. All four carrier materials maintained adequate survival and inoculum shelf life of the bacterium, as indicated by the field emission scanning electron microscopy analysis. The FM-based bioformulation was most efficacious and enhanced not only wheat grain yield (4-9%) but also seed P (9%). Moreover, FM-based bioformulation enhanced soil available P (8.5-11%) and phosphatase activity (4-5%). Positive correlations were observed between the PSB solubilization in the presence of different insoluble P sources, and soil available P, soil phosphatase activity, seed P content, and grain yield of the field grown inoculated wheat variety Faisalabad-2008, when di-ammonium phosphate fertilizer application was reduced by 20%. This study reports for the first time the marker gene expression of an inoculated PSB strain and provides a valuable groundwork to design field scale formulations that can maintain inoculum dynamics and increase its shelf life. This may constitute a step-change in the sustainable cultivation of wheat under the P-deficient soil conditions.
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Affiliation(s)
- Mahreen Yahya
- Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
| | - Maria Rasul
- Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
- Department of Environment and Energy, Sejong University, Seoul, South Korea
| | - Yasra Sarwar
- Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
| | - Muhammad Suleman
- Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
- School of Life Sciences, Institute of Microbiology, Lanzhou University, Lanzhou, China
| | - Mohsin Tariq
- Department of Bioinformatics and Biotechnology, Government College University Faisalabad (GCUF), Faisalabad, Pakistan
| | - Syed Zajif Hussain
- Department of Chemistry and Chemical Engineering, SBA School of Science and Engineering (SBA-SSE), Lahore University of Management Sciences (LUMS), Lahore, Pakistan
| | - Zahid Iqbal Sajid
- Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
| | - Asma Imran
- Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
| | - Imran Amin
- Agricultural Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
| | - Thomas Reitz
- Soil Ecology Department, UFZ-Helmholtz-Centre for Environmental Research, Halle, Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
| | - Mika Tapio Tarkka
- Soil Ecology Department, UFZ-Helmholtz-Centre for Environmental Research, Halle, Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
| | - Sumera Yasmin
- Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
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Rikame T, Borde M. Whole Genome, Functional Annotation and Comparative Genomics of Plant Growth-Promoting Bacteria Pseudomonas aeruginosa (NG61) with Potential Application in Agro-Industry. Curr Microbiol 2022; 79:169. [PMID: 35460384 DOI: 10.1007/s00284-022-02845-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 03/16/2022] [Indexed: 11/28/2022]
Abstract
A plant growth-promoting Rhizobacteria (PGPR) Pseudomonas aeruginosa (NG61) isolated from rhizosphere of Sunflower plant. The isolate was identified by 16S rRNA gene sequencing (Accession no. MK455763). NG61 showed various plant growth promotion and biocontrol activities like, Phosphate solubilisation, Nitrogen fixation, Ammonia production, IAA production, siderophore production, HCN production. The whole genome sequence of Pseudomonas aeruginosa (NG61) was reported and analysed. The estimated genome size was 6537180 bp with 66.18% of G+C content. The genome encoded 6186 protein-coding genes, 6252 genes were predicted, 66RNA genes. Phylogenetic tree showed that the P. aeruginosa( NG61) was closely related to P.aeruginosa strain DSM 50071. The annotated draft genome has been deposited at the NCBI database under the accession number PRJNA707114 BioProject and BioSample: SAMN18174979. The analysis of genome sequence of P. aeruginosa (NG61) showed various genes encoding plant growth promotion and biocontrol activities.
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Affiliation(s)
- Tejal Rikame
- Department of Botany, Savitribai Phule Pune University, Pune, MH, 411007, India
| | - Mahesh Borde
- Department of Botany, Savitribai Phule Pune University, Pune, MH, 411007, India.
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Ahmed S, Iqbal N, Tang X, Ahmad R, Irshad M, Irshad U. Organic amendment plus inoculum drivers: Who drives more P nutrition for wheat plant fitness in small duration soil experiment. PLoS One 2022; 17:e0266279. [PMID: 35417482 PMCID: PMC9007377 DOI: 10.1371/journal.pone.0266279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 03/17/2022] [Indexed: 11/18/2022] Open
Abstract
Functioning of ecosystems depends on the nutrient dynamics across trophic levels, largely mediated by microbial interactions in the soil food web. The present study investigated the use of phosphate solubilizing bacteria (PSB) and poultry manure (PM) for maintaining labile P in the soil for an extensive fertility enhancement and as a substitution of chemical fertilizers. Based on the different P solubilizing capabilities of Bacillus and Pseudomonas, a quadruple consortium of Bacillus subtilis, Bacillus cereus, Bacillus thuringiensis and Pseudomonas fluorescens, and their grazer nematodes (soil free living) supplemented with PM were studied. This study was carried out on the trophic levels of soil communities to assess the growth and availability of P to the wheat plants. Experiment was performed for 90 days. Comparing the unamended and amended predator results showed that nematode addition beyond bacterial treatment substantially increased the net available P by ≈2 times, and alkaline phosphatase (ALP) activity by 3.3 times. These results demonstrated the nematodes association with increasing nutrient availability or P mineralization. The interactive effect of PM as substrate and biological drivers was more noticeable on plant dry biomass (1.6 times) and plant P concentration (3.5times) compared to the similar unamended treatment. It is concluded that the biological drivers significantly enhanced the soil ALP and available P while the substrate and biological drivers enhanced dry biomass and plant P concentration. Bacterivore nematodes enhanced the effect of PSB for P mineralization via microbial loop and could be used for the enhancement of wheat production.
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Affiliation(s)
- Saba Ahmed
- Department of Environmental Sciences COMSATS, University Islamabad, Abbottabad, Pakistan
| | - Nadeem Iqbal
- Doctoral School of Environmental Sciences, University of Szeged, Szeged, Hungary
| | - Xiaoyan Tang
- College of Resources Sichuan Agriculture, University Chengdu, Chengdu, China
| | - Rafiq Ahmad
- Department of Environmental Sciences COMSATS, University Islamabad, Abbottabad, Pakistan
| | - Muhammad Irshad
- Department of Environmental Sciences COMSATS, University Islamabad, Abbottabad, Pakistan
| | - Usman Irshad
- Department of Environmental Sciences COMSATS, University Islamabad, Abbottabad, Pakistan
- * E-mail:
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González D, Robas M, Fernández V, Bárcena M, Probanza A, Jiménez PA. Comparative Metagenomic Study of Rhizospheric and Bulk Mercury-Contaminated Soils in the Mining District of Almadén. Front Microbiol 2022; 13:797444. [PMID: 35330761 PMCID: PMC8940170 DOI: 10.3389/fmicb.2022.797444] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 01/17/2022] [Indexed: 12/22/2022] Open
Abstract
Soil contamination by heavy metals, particularly mercury (Hg), is a problem that can seriously affect the environment, animals, and human health. Hg has the capacity to biomagnify in the food chain. That fact can lead to pathologies, of those which affect the central nervous system being the most severe. It is convenient to know the biological environmental indicators that alert of the effects of Hg contamination as well as the biological mechanisms that can help in its remediation. To contribute to this knowledge, this study conducted comparative analysis by the use of Shotgun metagenomics of the microbial communities in rhizospheric soils and bulk soil of the mining region of Almadén (Ciudad Real, Spain), one of the most affected areas by Hg in the world The sequences obtained was analyzed with MetaPhlAn2 tool and SUPER-FOCUS. The most abundant taxa in the taxonomic analysis in bulk soil were those of Actinobateria and Alphaproteobacteria. On the contrary, in the rhizospheric soil microorganisms belonging to the phylum Proteobacteria were abundant, evidencing that roots have a selective effect on the rhizospheric communities. In order to analyze possible indicators of biological contamination, a functional potential analysis was performed. The results point to a co-selection of the mechanisms of resistance to Hg and the mechanisms of resistance to antibiotics or other toxic compounds in environments contaminated by Hg. Likewise, the finding of antibiotic resistance mechanisms typical of the human clinic, such as resistance to beta-lactams and glycopeptics (vancomycin), suggests that these environments can behave as reservoirs. The sequences involved in Hg resistance (operon mer and efflux pumps) have a similar abundance in both soil types. However, the response to abiotic stress (salinity, desiccation, and contaminants) is more prevalent in rhizospheric soil. Finally, sequences involved in nitrogen fixation and metabolism and plant growth promotion (PGP genes) were identified, with higher relative abundances in rhizospheric soils. These findings can be the starting point for the targeted search for microorganisms suitable for further use in bioremediation processes in Hg-contaminated environments.
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Affiliation(s)
- Daniel González
- Department of Pharmaceutical Science and Health, CEU Universities, Boadilla del Monte, Spain
| | - Marina Robas
- Department of Pharmaceutical Science and Health, CEU Universities, Boadilla del Monte, Spain
| | - Vanesa Fernández
- Department of Pharmaceutical Science and Health, CEU Universities, Boadilla del Monte, Spain
| | - Marta Bárcena
- Department of Pharmaceutical Science and Health, CEU Universities, Boadilla del Monte, Spain
| | - Agustín Probanza
- Department of Pharmaceutical Science and Health, CEU Universities, Boadilla del Monte, Spain
| | - Pedro A Jiménez
- Department of Pharmaceutical Science and Health, CEU Universities, Boadilla del Monte, Spain
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Yuan W, Ruan S, Qi G, Wang R, Zhao X. Plant growth-promoting and antibacterial activities of cultivable bacteria alive in tobacco field against Ralstonia solanacearum. Environ Microbiol 2022; 24:1411-1429. [PMID: 35112429 DOI: 10.1111/1462-2920.15868] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Accepted: 12/06/2021] [Indexed: 11/28/2022]
Abstract
Bacterial wilt disease caused by Ralstonia solanacearum leads to decrease of crops yield. Investigation of cultivable bacteria diversity provides more microbial species for screening antagonistic bacteria. In the present study, a variety of cultivation methods were used to investigate the diversity of cultivable bacteria alive in tobacco field. A total of 441 bacterial strains were obtained that belonged to four phyla, 49 genera and 146 species. Actinobacteria and Proteobacteria were the dominant phyla. Agrobacterium, Arthrobacter, Bacillus, Klebsiella, Paenarthrobacter, Pseudomonas and Pseudarthrobacter were the dominant genera. Some rare genera were discovered including Bosea, Cedecea, Delftia and Dyella. Diversity, species and abundances of bacteria altered under different cultivation conditions. One hundred three bacterial strains showed plant growth-promoting attributes. Twenty Bacillus strains showed high antibacterial activity against R. solanacearum. In field experiments, individual strain and consortia of Bacillus subtilis, B. siamensis and B. vallismortis effectively inhibited bacterial wilt. The core genes that controlled synthesis of secondary metabolites were knocked out in B. vallismortis SSB-10. Difficidin, which was synthesized by dif operon and controlled by sfp gene, was the antibacterial substance produced by SSB-10. Difficidin destroyed cell wall and cell membrane of R. solanacearum and inhibited its motility, production of extracellular polysaccharides and cellulase activity.
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Affiliation(s)
- Wenfang Yuan
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Song Ruan
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Gaofu Qi
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Rui Wang
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Xiuyun Zhao
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
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Uzma M, Iqbal A, Hasnain S. Drought tolerance induction and growth promotion by indole acetic acid producing Pseudomonas aeruginosa in Vigna radiata. PLoS One 2022; 17:e0262932. [PMID: 35120147 PMCID: PMC8815908 DOI: 10.1371/journal.pone.0262932] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Accepted: 01/07/2022] [Indexed: 11/18/2022] Open
Abstract
Drought accompanied with reduced precipitation is one of the key manacles to global agricultural throughput and is expected to escalate further hence posing major challenges to future food safety. For a sustainable agricultural environment, drought resistant plant growth promoting rhizobacteria (PGPR) are new encouraging prospect, which are inexpensive and have no side effects, as those of synthetic fertilizers. In the present study, five strains of Pseudomonas aeruginosa, the strain MK513745, strain MK513746, strain MK513747, strain MK513748, and strain MK513749 were used as drought tolerant PGPR with multiple traits of IAA production, N fixation, P solubilization, siderophore producing capabilities. The strain MK513745 and strain MK513749 produced higher quantities of indole acetic acid (116±0.13 and 108±0.26 μg ml-1). MK513749 yielded 12 different indole compounds in GCMS analysis. The strain MK513748 yielded maximum S.I. (3.33mm) for phosphate solubilizing test. Maximum nitrogen concentration was produced (0.18 μg ml-1) by strain MK513746. Percent siderophore units ranged from 2.65% to 2.83% as all five pseudomonas strains were siderophore positive. In all growth experiments of plant microbe interaction two varieties of Vigna radiata (AZRI-06, NM-11) plants inoculated with P. aeruginosa strains under drought stress responded significantly (P<0.05) better than control stressed plants. Maximum shoot length was enhanced up-to 125%, pod/plant 172%, number of grains 65%, 100 seed weight 95%, 100 seed straw weight 124% and total yield 293% were recorded in plants inoculated with drought stress tolerant PGPR in both varieties as compared to respective stressed control plants. Photosynthetic activity, membrane stability (45%), water content (68%) and antioxidant efficacy (19%) were improved with PGPR inoculations. The variety NM-11 (V2) was more tolerant to drought stress with inoculations of Pseudomonas strains than AZRI-06 (V1). Inoculations with these indole acetic acid producing strains would be suitable for plant growth promotion in areas facing water deficiency.
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Affiliation(s)
- Malika Uzma
- Department of Microbiology and Molecular Genetics, The Women University, Multan, Pakistan
| | - Atia Iqbal
- Department of Microbiology and Molecular Genetics, The Women University, Multan, Pakistan
| | - Shahida Hasnain
- Department of Microbiology and Molecular Genetics, University of the Punjab, Lahore, Pakistan
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Zhang X, Wang N, Hou M, Wu H, Jiang H, Zhou Z, Chang N, Wang Q, Wan X, Jiang J, Shen Z, Li Y. Contribution of K solubilising bacteria ( Burkholderia sp.) promotes tea plant growth ( Camellia sinesis) and leaf polyphenols content by improving soil available K level. FUNCTIONAL PLANT BIOLOGY : FPB 2022; 49:283-294. [PMID: 35101164 DOI: 10.1071/fp21193] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 12/21/2021] [Indexed: 06/14/2023]
Abstract
K+ availability is important for growth and quality of tea (Camellia sine sis L.). K solubilising bacteria convert insoluble K to available K. This study was conducted to screen K solubilising bacteria isolated from tea rhizosphere soil in Qimen county, Anhui province, China. The maximum K solubilisation colony (the ratio of diameter halo/colony was 2.54) was identified as Burkholderia sp. (storage number: M2021105) by biochemistry and molecular analysis. Pot experiments (Laterite) showed that the inoculation of Burkholderia sp. significantly improved tea plant height (Zhongcha108, 1 year old) and total polyphenols content by 21.14% and 21.58% compared with the control, respectively. Higher polyphenol level promoted the formation of theaflavin in the fermentation experiments. Further experiments showed that tartaric acid and pryuvic acid produced by Burkholderia sp. are important components associated with K solubilisation in vitro . Burkholderia sp. significantly increased soil available K by 15.12%; however, there was no significant difference in available N and P, and Cu, Mg, Zn and Ca compared with the control. K content in inoculated tea roots and leaves was significantly higher (50% and 10%, respectively) than the control. Compared with the control, exogenous supply of 60mgkg-1 K significantly increased levels of polyphenol (53.97%), theaflavin (16.31%), theaflavin-3-gallate (20%), theaflavin 3'-gallic acid ester (32.24%) and theaflavin 3,3'-gallic acid ester (40.95%). Due to its ability to enable higher available soil K, ur study indicated that Burkholderia sp. have potential to increase total polyphenols content be a bio-inoculant for biofortification of tea.
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Affiliation(s)
- Xianchen Zhang
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
| | - Ningning Wang
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
| | - Mengmeng Hou
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518120, China
| | - Honghong Wu
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Hong Jiang
- Anhui Keemun Black Tea Industry Co., Ltd., Huangshan City, Anhui Province, China
| | - Ziwen Zhou
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
| | - Na Chang
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
| | - Qianqian Wang
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
| | - Xiaochun Wan
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
| | - Jiayue Jiang
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
| | - Zhougao Shen
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
| | - Yeyun Li
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
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Mir MI, Hameeda B, Quadriya H, Kumar BK, Ilyas N, Kee Zuan AT, El Enshasy HA, Dailin DJ, Kassem HS, Gafur A, Sayyed RZ. Multifarious Indigenous Diazotrophic Rhizobacteria of Rice ( Oryza sativa L.) Rhizosphere and Their Effect on Plant Growth Promotion. Front Nutr 2022; 8:781764. [PMID: 35096930 PMCID: PMC8793879 DOI: 10.3389/fnut.2021.781764] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Accepted: 12/15/2021] [Indexed: 11/16/2022] Open
Abstract
A diverse group of rhizobacteria persists in the rhizospheric soil, on the surface of roots, or in association with rice plants. These bacteria colonize plant root systems, enhance plant growth and crop yield. Indigenous rhizobacteria are known to promote soil health, grain production quality and serve as sustainable bioinoculant. The present study was aimed to isolate, identify and characterize indigenous plant growth promoting (PGP) diazotrophic bacteria associated with the rhizosphere of rice fields from different areas of Jammu and Kashmir, India. A total of 15 bacteria were isolated and evaluated for various PGP traits, antagonistic activity against phytopathogens, production of hydrolytic enzymes and biofilm formation under in-vitro conditions. The majority of the isolated bacteria were Gram-negative. Out of 15 bacterial isolates, nine isolates produced IAA (12.24 ± 2.86 to 250.3 ± 1.15 μg/ml), 6 isolates exhibited phosphate solubilization activity (36.69 ± 1.63 to 312.4 ± 1.15 μg/ml), 7 isolates exhibited rock phosphate solubilization while 5 isolates solubilized zinc (10-18 mm), 7 isolates showed siderophore production, 8 isolates exhibited HCN production, 6 isolates exhibited aminocyclopropane-1-carboxylate (ACC) deaminase activity, 13 isolates exhibited cellulase activity, nine isolates exhibited amylase and lipase activity and six isolates exhibited chitinase activity. In addition, 5 isolates showed amplification with the nifH gene and showed a significant amount of nitrogenase activity in a range of 0.127-4.39 μmol C2H4/mg protein/h. Five isolates viz., IHK-1, IHK-3, IHK-13, IHK-15 and IHK-25 exhibited most PGP attributes and successfully limited the mycelial growth of Rhizoctonia solani and Fusarium oxysporum in-vitro. All the five bacterial isolates were identified based on morphological, biochemical and 16S rDNA gene sequencing study, as Stenotrophomonas maltophilia, Enterobacter sp., Bacillus sp., Ochrobactrum haematophilum and Pseudomonas aeruginosa. Rice plants developed from seeds inoculated with these PGP strains individually had considerably higher germination percentage, seed vigor index and total dry biomass when compared to control. These findings strongly imply that the PGP diazotrophic bacteria identified in this work could be employed as plant growth stimulators in rice.
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Affiliation(s)
- Mohammad Imran Mir
- Department of Botany, University College of Science, Osmania University, Hyderabad, India
| | - Bee Hameeda
- Department of Microbiology, University College of Science, Osmania University, Hyderabad, India
| | - Humera Quadriya
- Department of Microbiology, University College of Science, Osmania University, Hyderabad, India
| | - B. Kiran Kumar
- Department of Botany, University College of Science, Osmania University, Hyderabad, India
| | - Noshin Ilyas
- Department of Botany, Pir Mehr Ali Shah Arid Agriculture University, Rawalpindi, Pakistan
| | - Ali Tan Kee Zuan
- Department of Land Management, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Malaysia
| | - Hesham Ali El Enshasy
- Institute of Bioproduct Development, Universiti Teknologi Malaysia, Skudai, Malaysia
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Skudai, Malaysia
- City of Scientific Research and Technology Applications, New Burg Al Arab, Alexandria, Egypt
| | - Daniel Joe Dailin
- Institute of Bioproduct Development, Universiti Teknologi Malaysia, Skudai, Malaysia
| | - Hazem S. Kassem
- Department of Agricultural Extension and Rural Society, College of Food and Agriculture Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Abdul Gafur
- Sinarmas Forestry Corporate Research and Development, Perawang, Indonesia
| | - R. Z. Sayyed
- Asian Plant Growth Promoting Rhizobacteria Society (PGPR) for Sustainable Agriculture, Auburn University, Auburn, AL, United States
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