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Dolphen R, Treesubsuntorn C, Kanjanapokin C, Chonjoho N, Anusaraporn S, Julpanwattana P, Praditsmanont A. Exploring bioluminescence in Aglaonema: investigating Vibrio campbellii translocation and plant responses under CaCl₂ stimulation. ENVIRONMENTAL RESEARCH 2024:119414. [PMID: 38871271 DOI: 10.1016/j.envres.2024.119414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2024] [Revised: 06/05/2024] [Accepted: 06/11/2024] [Indexed: 06/15/2024]
Abstract
The feasibility of creating light-emitting plants by immobilizing Vibrio campbellii RMT1 on the rhizospheric zone of Aglaonema sp. 'Banlangngoen' was investigated in depth, including bacteria translocation and plant response. Results from scanning electron microscope showed that an inorganic salt-containing medium affected the root. However, transmission electron microscope results displayed bacteria translocation through the root to the leaf and colonized in the cytosol of vascular tissues. Bacteria cell counts exhibited high colonization in the root zone, approximately 3.65 × 106 CFU/mL, resulting in a light-emitting intensity increase of 23.68-fold higher than the control after the first week. Nevertheless, light microscope revealed that inorganic salts in the culture medium led to enlarged air spaces, resulting in leaf and stalk withering. Notably, spraying plants with calcium chloride (CaCl2) solution effectively mitigated salt stress, activated luminescence, and facilitated bacterial movement from roots to leaves. Additionally, CaCl2 contributed to ongoing salinity reduction in the culture medium, as evidenced by reduced malondialdehyde levels, alongside increased indole-3-acetic acid and salicylic acid concentrations, indicating plant defense responses. The interaction between plants and luminescent bacteria demonstrated the potential for producing glowing plants following CaCl2 application, addressing salinity stress, enhancing luminescence, and maintaining plant growth.
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Affiliation(s)
- Rujira Dolphen
- Pilot Plant Development and Training Institute, King Mongkut's University of Technology Thonburi, Bangkok, 10150, Thailand.
| | - Chairat Treesubsuntorn
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkok, 10150, Thailand
| | - Chutipa Kanjanapokin
- Pilot Plant Development and Training Institute, King Mongkut's University of Technology Thonburi, Bangkok, 10150, Thailand
| | - Nattida Chonjoho
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkok, 10150, Thailand
| | - Siraphatsorn Anusaraporn
- Pilot Plant Development and Training Institute, King Mongkut's University of Technology Thonburi, Bangkok, 10150, Thailand
| | - Panpisu Julpanwattana
- Research and Innovation for Sustainability Center (RISC), Magnolia Quality Development Corporation Limited (MQDC), Thailand
| | - Apichat Praditsmanont
- Research and Innovation for Sustainability Center (RISC), Magnolia Quality Development Corporation Limited (MQDC), Thailand
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Zhou Q, Wang Y, Yue L, Ye A, Xie X, Zhang M, Tian Y, Liu Y, Turatsinze AN, Constantine U, Zhao X, Zhang Y, Wang R. Impacts of continuous cropping on the rhizospheric and endospheric microbial communities and root exudates of Astragalus mongholicus. BMC PLANT BIOLOGY 2024; 24:340. [PMID: 38671402 PMCID: PMC11047024 DOI: 10.1186/s12870-024-05024-5] [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: 01/15/2024] [Accepted: 04/15/2024] [Indexed: 04/28/2024]
Abstract
Astragalus mongholicus is a medicinal plant that is known to decrease in quality in response to continuous cropping. However, the differences in the root-associated microbiome and root exudates in the rhizosphere soil that may lead to these decreases are barely under studies. We investigated the plant biomass production, root-associated microbiota, and root exudates of A. mongholicus grown in two different fields: virgin soil (Field I) and in a long-term continuous cropping field (Field II). Virgin soil is soil that has never been cultivated for A. mongholicus. Plant physiological measurements showed reduced fresh and dry weight of A. mongholicus under continuous cropping conditions (i.e. Field II). High-throughput sequencing of the fungal and bacterial communities revealed differences in fungal diversity between samples from the two fields, including enrichment of potentially pathogenic fungi in the roots of A. mongholicus grown in Field II. Metabolomic analysis yielded 20 compounds in A. mongholicus root exudates that differed in relative abundance between rhizosphere samples from the two fields. Four of these metabolites (2-aminophenol, quinic acid, tartaric acid, and maleamate) inhibited the growth of A. mongholicus, the soil-borne pathogen Fusarium oxysporum, or both. This comprehensive analysis enhances our understanding of the A. mongholicus microbiome, root exudates, and interactions between the two in response to continuous cropping. These results offer new information for future design of effective, economical approaches to achieving food security.
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Affiliation(s)
- Qin Zhou
- Gansu Gaolan Field Scientific Observation and Research Station for Agricultural Ecosystem, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China
- Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province, Lanzhou, 730000, China
| | - Yun Wang
- Gansu Gaolan Field Scientific Observation and Research Station for Agricultural Ecosystem, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China
- Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province, Lanzhou, 730000, China
| | - Liang Yue
- Gansu Gaolan Field Scientific Observation and Research Station for Agricultural Ecosystem, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China
- Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province, Lanzhou, 730000, China
| | - Ailing Ye
- Gansu Gaolan Field Scientific Observation and Research Station for Agricultural Ecosystem, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China
- Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province, Lanzhou, 730000, China
| | - Xiaofan Xie
- Gansu Gaolan Field Scientific Observation and Research Station for Agricultural Ecosystem, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China
- Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province, Lanzhou, 730000, China
| | - Meilan Zhang
- Gansu Gaolan Field Scientific Observation and Research Station for Agricultural Ecosystem, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China
- Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province, Lanzhou, 730000, China
- General Station of Gansu Cultivated Land Quality Construction and Protection, Lanzhou, 730000, China
| | - Yuan Tian
- Gansu Gaolan Field Scientific Observation and Research Station for Agricultural Ecosystem, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China
- Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province, Lanzhou, 730000, China
| | - Yang Liu
- Gansu Gaolan Field Scientific Observation and Research Station for Agricultural Ecosystem, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China
- Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province, Lanzhou, 730000, China
| | - Andéole Niyongabo Turatsinze
- Gansu Gaolan Field Scientific Observation and Research Station for Agricultural Ecosystem, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China
- Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province, Lanzhou, 730000, China
| | - Uwaremwe Constantine
- Gansu Gaolan Field Scientific Observation and Research Station for Agricultural Ecosystem, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China
- Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province, Lanzhou, 730000, China
| | - Xia Zhao
- Gansu Gaolan Field Scientific Observation and Research Station for Agricultural Ecosystem, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China
- Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province, Lanzhou, 730000, China
| | - Yubao Zhang
- Gansu Gaolan Field Scientific Observation and Research Station for Agricultural Ecosystem, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China
| | - Ruoyu Wang
- Gansu Gaolan Field Scientific Observation and Research Station for Agricultural Ecosystem, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, China.
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Negi R, Sharma B, Kumar S, Chaubey KK, Kaur T, Devi R, Yadav A, Kour D, Yadav AN. Plant endophytes: unveiling hidden applications toward agro-environment sustainability. Folia Microbiol (Praha) 2024; 69:181-206. [PMID: 37747637 DOI: 10.1007/s12223-023-01092-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 09/04/2023] [Indexed: 09/26/2023]
Abstract
Endophytic microbes are plant-associated microorganisms that reside in the interior tissue of plants without causing damage to the host plant. Endophytic microbes can boost the availability of nutrient for plant by using a variety of mechanisms such as fixing nitrogen, solubilizing phosphorus, potassium, and zinc, and producing siderophores, ammonia, hydrogen cyanide, and phytohormones that help plant for growth and protection against various abiotic and biotic stresses. The microbial endophytes have attained the mechanism of producing various hydrolytic enzymes such as cellulase, pectinase, xylanase, amylase, gelatinase, and bioactive compounds for plant growth promotion and protection. The efficient plant growth promoting endophytic microbes could be used as an alternative of chemical fertilizers for agro-environmental sustainability. Endophytic microbes belong to different phyla including Euryarchaeota, Ascomycota, Basidiomycota, Mucoromycota, Firmicutes, Proteobacteria, and Actinobacteria. The most pre-dominant group of bacteria belongs to Proteobacteria including α-, β-, γ-, and δ-Proteobacteria. The least diversity of the endophytic microbes have been revealed from Bacteroidetes, Deinococcus-Thermus, and Acidobacteria. Among reported genera, Achromobacter, Burkholderia, Bacillus, Enterobacter, Herbaspirillum, Pseudomonas, Pantoea, Rhizobium, and Streptomyces were dominant in most host plants. The present review deals with plant endophytic diversity, mechanisms of plant growth promotion, protection, and their role for agro-environmental sustainability. In the future, application of endophytic microbes have potential role in enhancement of crop productivity and maintaining the soil health in sustainable manner.
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Affiliation(s)
- Rajeshwari Negi
- Department of Biotechnology, Dr. Khem Singh Gill Akal College of Agriculture, Eternal University, Baru Sahib, Sirmour, 173101, Himachal Pradesh, India
| | - Babita Sharma
- Department of Microbiology, Akal College of Basic Sciences, Eternal University, Baru Sahib, Sirmour, 173101, Himachal Pradesh, India
| | - Sanjeev Kumar
- Faculty of Agricultural Sciences, GLA University, Mathura, 281406, Uttar Pradesh, India
| | - Kundan Kumar Chaubey
- Division of Research and Innovation, School of Applied and Life Sciences, Uttaranchal University, Premnagar, Dehradun, 248007, Uttarakhand, India
| | - Tanvir Kaur
- Department of Biotechnology, Dr. Khem Singh Gill Akal College of Agriculture, Eternal University, Baru Sahib, Sirmour, 173101, Himachal Pradesh, India
| | - Rubee Devi
- Department of Biotechnology, Dr. Khem Singh Gill Akal College of Agriculture, Eternal University, Baru Sahib, Sirmour, 173101, Himachal Pradesh, India
| | - Ashok Yadav
- Department of Botany, Banaras Hindu University, Varanasi, 221005, Uttar Pradesh, India
| | - Divjot Kour
- Department of Microbiology, Akal College of Basic Sciences, Eternal University, Baru Sahib, Sirmour, 173101, Himachal Pradesh, India
| | - Ajar Nath Yadav
- Department of Biotechnology, Dr. Khem Singh Gill Akal College of Agriculture, Eternal University, Baru Sahib, Sirmour, 173101, Himachal Pradesh, India.
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Asif S, Jan R, Kim N, Asaf S, Lubna, Khan MA, Kim EG, Jang YH, Bhatta D, Lee IJ, Kim KM. Halotolerant endophytic bacteria alleviate salinity stress in rice (oryza sativa L.) by modulating ion content, endogenous hormones, the antioxidant system and gene expression. BMC PLANT BIOLOGY 2023; 23:494. [PMID: 37833628 PMCID: PMC10576267 DOI: 10.1186/s12870-023-04517-z] [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: 02/27/2023] [Accepted: 10/09/2023] [Indexed: 10/15/2023]
Abstract
Excessive salinity reduces crop production and negatively impacts agriculture worldwide. We previously isolated endophytic bacterial strains from two halophytic species: Artemisia princeps and Chenopodium ficifolium. We used three bacterial isolates: ART-1 (Lysinibacillus fusiformis), ART-10 (Lysinibacillus sphaericus), and CAL-8 (Brevibacterium pityocampae) to alleviate the impact of salinity stress on rice. The impact of 160 mM NaCl salinity on rice was significantly mitigated following inoculation with these bacterial strains, resulting in increased growth and chlorophyll content. Furthermore, OsNHX1, OsAPX1, OsPIN1 and OsCATA expression was increased, but OsSOS expression was decreased. Inductively coupled plasma mass spectrometry (ICP-MS) revealed reduced K+ and Na+ levels in shoots of bacteria-inoculated plants, whereas that of Mg2+ was increased. Bacterial inoculation reduced the content of total flavonoids in rice leaves. Salinized plants inoculated with bacteria showed reduced levels of endogenous salicylic acid (SA) and abscisic acid (ABA) but increased levels of jasmonic acid (JA). In conclusion, the bacterial isolates ART-1, ART-10, and CAL-8 alleviated the adverse effect of salinity on rice growth, which justifies their use as an eco-friendly agricultural practice.
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Affiliation(s)
- Saleem Asif
- Department of Applied Biosciences, Graduate School, Kyungpook National University, Daegu, 41566, South Korea
| | - Rahmatullah Jan
- Department of Applied Biosciences, Graduate School, Kyungpook National University, Daegu, 41566, South Korea.
- Coastal Agriculture Research Institute, Kyungpook National University, Daegu, South Korea.
| | - Nari Kim
- Department of Applied Biosciences, Graduate School, Kyungpook National University, Daegu, 41566, South Korea
| | - Sajjad Asaf
- Natural and Medical Science Research Center, University of Nizwa, Nizwa, Oman
| | - Lubna
- Natural and Medical Science Research Center, University of Nizwa, Nizwa, Oman
| | - Muhammad Aaqil Khan
- Department of chemical and life sciences, Qurtuba university of science and information technology, Peshawar, Pakistan
| | - Eun-Gyeong Kim
- Department of Applied Biosciences, Graduate School, Kyungpook National University, Daegu, 41566, South Korea
| | - Yoon-Hee Jang
- Department of Applied Biosciences, Graduate School, Kyungpook National University, Daegu, 41566, South Korea
| | - Dibya Bhatta
- Department of Applied Biosciences, Graduate School, Kyungpook National University, Daegu, 41566, South Korea
| | - In-Jung Lee
- Department of Applied Biosciences, Graduate School, Kyungpook National University, Daegu, 41566, South Korea
| | - Kyung-Min Kim
- Department of Applied Biosciences, Graduate School, Kyungpook National University, Daegu, 41566, South Korea.
- Coastal Agriculture Research Institute, Kyungpook National University, Daegu, South Korea.
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5
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Ansari M, Devi BM, Sarkar A, Chattopadhyay A, Satnami L, Balu P, Choudhary M, Shahid MA, Jailani AAK. Microbial Exudates as Biostimulants: Role in Plant Growth Promotion and Stress Mitigation. J Xenobiot 2023; 13:572-603. [PMID: 37873814 PMCID: PMC10594471 DOI: 10.3390/jox13040037] [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: 08/02/2023] [Revised: 09/18/2023] [Accepted: 09/21/2023] [Indexed: 10/25/2023] Open
Abstract
Microbes hold immense potential, based on the fact that they are widely acknowledged for their role in mitigating the detrimental impacts of chemical fertilizers and pesticides, which were extensively employed during the Green Revolution era. The consequence of this extensive use has been the degradation of agricultural land, soil health and fertility deterioration, and a decline in crop quality. Despite the existence of environmentally friendly and sustainable alternatives, microbial bioinoculants encounter numerous challenges in real-world agricultural settings. These challenges include harsh environmental conditions like unfavorable soil pH, temperature extremes, and nutrient imbalances, as well as stiff competition with native microbial species and host plant specificity. Moreover, obstacles spanning from large-scale production to commercialization persist. Therefore, substantial efforts are underway to identify superior solutions that can foster a sustainable and eco-conscious agricultural system. In this context, attention has shifted towards the utilization of cell-free microbial exudates as opposed to traditional microbial inoculants. Microbial exudates refer to the diverse array of cellular metabolites secreted by microbial cells. These metabolites enclose a wide range of chemical compounds, including sugars, organic acids, amino acids, peptides, siderophores, volatiles, and more. The composition and function of these compounds in exudates can vary considerably, depending on the specific microbial strains and prevailing environmental conditions. Remarkably, they possess the capability to modulate and influence various plant physiological processes, thereby inducing tolerance to both biotic and abiotic stresses. Furthermore, these exudates facilitate plant growth and aid in the remediation of environmental pollutants such as chemicals and heavy metals in agroecosystems. Much like live microbes, when applied, these exudates actively participate in the phyllosphere and rhizosphere, engaging in continuous interactions with plants and plant-associated microbes. Consequently, they play a pivotal role in reshaping the microbiome. The biostimulant properties exhibited by these exudates position them as promising biological components for fostering cleaner and more sustainable agricultural systems.
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Affiliation(s)
- Mariya Ansari
- Department of Mycology and Plant Pathology, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India; (M.A.); (A.S.); (L.S.)
| | - B. Megala Devi
- Department of Environmental Biotechnology, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India;
| | - Ankita Sarkar
- Department of Mycology and Plant Pathology, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India; (M.A.); (A.S.); (L.S.)
| | - Anirudha Chattopadhyay
- Pulses Research Station, S.D. Agricultural University, Sardarkrushinagar 385506, Gujarat, India;
| | - Lovkush Satnami
- Department of Mycology and Plant Pathology, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India; (M.A.); (A.S.); (L.S.)
| | - Pooraniammal Balu
- Department of Biotechnology, Sastra Deemed University, Thanjavur 613401, Tamil Nadu, India;
| | - Manoj Choudhary
- Plant Pathology Department, University of Florida, Gainesville, FL 32611, USA;
| | - Muhammad Adnan Shahid
- Horticultural Science Department, North Florida Research and Education Center, University of Florida/IFAS, Quincy, FL 32351, USA;
| | - A. Abdul Kader Jailani
- Plant Pathology Department, University of Florida, Gainesville, FL 32611, USA;
- Plant Pathology Department, North Florida Research and Education Center, University of Florida, Quincy, FL 32351, USA
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Anand U, Pal T, Yadav N, Singh VK, Tripathi V, Choudhary KK, Shukla AK, Sunita K, Kumar A, Bontempi E, Ma Y, Kolton M, Singh AK. Current Scenario and Future Prospects of Endophytic Microbes: Promising Candidates for Abiotic and Biotic Stress Management for Agricultural and Environmental Sustainability. MICROBIAL ECOLOGY 2023; 86:1455-1486. [PMID: 36917283 PMCID: PMC10497456 DOI: 10.1007/s00248-023-02190-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Accepted: 02/02/2023] [Indexed: 06/18/2023]
Abstract
Globally, substantial research into endophytic microbes is being conducted to increase agricultural and environmental sustainability. Endophytic microbes such as bacteria, actinomycetes, and fungi inhabit ubiquitously within the tissues of all plant species without causing any harm or disease. Endophytes form symbiotic relationships with diverse plant species and can regulate numerous host functions, including resistance to abiotic and biotic stresses, growth and development, and stimulating immune systems. Moreover, plant endophytes play a dominant role in nutrient cycling, biodegradation, and bioremediation, and are widely used in many industries. Endophytes have a stronger predisposition for enhancing mineral and metal solubility by cells through the secretion of organic acids with low molecular weight and metal-specific ligands (such as siderophores) that alter soil pH and boost binding activity. Finally, endophytes synthesize various bioactive compounds with high competence that are promising candidates for new drugs, antibiotics, and medicines. Bioprospecting of endophytic novel secondary metabolites has given momentum to sustainable agriculture for combating environmental stresses. Biotechnological interventions with the aid of endophytes played a pivotal role in crop improvement to mitigate biotic and abiotic stress conditions like drought, salinity, xenobiotic compounds, and heavy metals. Identification of putative genes from endophytes conferring resistance and tolerance to crop diseases, apart from those involved in the accumulation and degradation of contaminants, could open new avenues in agricultural research and development. Furthermore, a detailed molecular and biochemical understanding of endophyte entry and colonization strategy in the host would better help in manipulating crop productivity under changing climatic conditions. Therefore, the present review highlights current research trends based on the SCOPUS database, potential biotechnological interventions of endophytic microorganisms in combating environmental stresses influencing crop productivity, future opportunities of endophytes in improving plant stress tolerance, and their contribution to sustainable remediation of hazardous environmental contaminants.
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Affiliation(s)
- Uttpal Anand
- Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, 8499000, Midreshet Ben-Gurion, Israel.
| | - Tarun Pal
- Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, 8499000, Midreshet Ben-Gurion, Israel
| | - Niraj Yadav
- French Associates Institute for Agriculture and Biotechnology of Drylands, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sde Boker Campus, 8499000, Midreshet Ben-Gurion, Israel
| | - Vipin Kumar Singh
- Department of Botany, K.S. Saket P.G. College, Ayodhya affiliated to Dr. Rammanohar Lohia Avadh University, Ayodhya, 224123, Uttar Pradesh, India
| | - Vijay Tripathi
- Department of Molecular and Cellular Engineering, Jacob Institute of Biotechnology and Bioengineering, Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj, 211007, Uttar Pradesh, India
| | - Krishna Kumar Choudhary
- Department of Botany, Mahila Mahavidyalaya, Banaras Hindu University, Varanasi, 221005, Uttar Pradesh, India
| | - Awadhesh Kumar Shukla
- Department of Botany, K.S. Saket P.G. College, Ayodhya affiliated to Dr. Rammanohar Lohia Avadh University, Ayodhya, 224123, Uttar Pradesh, India
| | - Kumari Sunita
- Department of Botany, Deen Dayal Upadhyay Gorakhpur University, Gorakhpur, Uttar Pradesh, 273009, India
| | - Ajay Kumar
- Department of Postharvest Science, Agricultural Research Organization, The Volcani Center, P.O. Box 15159, 7505101, Rishon, Lezion, Israel
| | - Elza Bontempi
- INSTM and Chemistry for Technologies Laboratory, University of Brescia, Via Branze 38, 25123, Brescia, Italy.
| | - Ying Ma
- Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456, Coimbra, Portugal
| | - Max Kolton
- French Associates Institute for Agriculture and Biotechnology of Drylands, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sde Boker Campus, 8499000, Midreshet Ben-Gurion, Israel
| | - Amit Kishore Singh
- Department of Botany, Bhagalpur National College (A constituent unit of Tilka Manjhi Bhagalpur University), Bhagalpur, 812007, Bihar, India.
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7
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Feng Y, Zhang Y, Shah OU, Luo K, Chen Y. Isolation and Identification of Endophytic Bacteria Bacillus sp. ME9 That Exhibits Biocontrol Activity against Xanthomonas phaseoli pv. manihotis. BIOLOGY 2023; 12:1231. [PMID: 37759630 PMCID: PMC10525512 DOI: 10.3390/biology12091231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2023] [Revised: 09/01/2023] [Accepted: 09/07/2023] [Indexed: 09/29/2023]
Abstract
In recent years, the bacterial blight of cassava has caused substantial economic losses to the Chinese cassava industry. Chemical control methods have become the primary approach to control this disease; however, their widespread usage and harmful residues have raised concerns about environmental pollution. In order to avoid this, it is urgent to seek a green ecological method to prevent and control it. Biological control through the utilization of microorganisms not only effectively inhibits the disease, but also gives consideration to environmental friendliness. Therefore, investigating an endophytic biological control method for cassava bacterial blight is of great importance. In this study, cassava leaf tissues were used as test specimens in order to isolate endophytic bacteria by using dilution and separation methods. Bacillus ME9, derived from cassava endophytic bacteria, exhibits good antagonism against a diverse range of pathogens, including Xpm11. Its genome consists of a series of genes encoding antibacterial lipopeptides, which may be directly related to its antibacterial capabilities. Furthermore, inoculation resulted in a substantial change in the diversity of the endophytic bacterial community, characterized by improved diversity, and displayed an obvious inhibition of pathogenic bacterial growth, demonstrating successful colonization within plants. The results laid a foundation and provided theoretical support for the development and utilization of cassava endophytic bacterial diversity and endogenous disease control strategies.
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Affiliation(s)
- Yating Feng
- Sanya Nanfan Research Institute, Hainan University, Sanya 572025, China (O.U.S.)
- School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
| | - Yijie Zhang
- Sanya Nanfan Research Institute, Hainan University, Sanya 572025, China (O.U.S.)
- School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
| | - Obaid Ullah Shah
- Sanya Nanfan Research Institute, Hainan University, Sanya 572025, China (O.U.S.)
- Collaborative Innovation Center of Nanfan and High-Efficiency Tropical Agriculture, School of Tropical Crops, Hainan University, Haikou 570228, China
| | - Kai Luo
- Sanya Nanfan Research Institute, Hainan University, Sanya 572025, China (O.U.S.)
| | - Yinhua Chen
- Sanya Nanfan Research Institute, Hainan University, Sanya 572025, China (O.U.S.)
- School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
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Singh A, Mazahar S, Chapadgaonkar SS, Giri P, Shourie A. Phyto-microbiome to mitigate abiotic stress in crop plants. Front Microbiol 2023; 14:1210890. [PMID: 37601386 PMCID: PMC10433232 DOI: 10.3389/fmicb.2023.1210890] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Accepted: 07/11/2023] [Indexed: 08/22/2023] Open
Abstract
Plant-associated microbes include taxonomically diverse communities of bacteria, archaebacteria, fungi, and viruses, which establish integral ecological relationships with the host plant and constitute the phyto-microbiome. The phyto-microbiome not only contributes in normal growth and development of plants but also plays a vital role in the maintenance of plant homeostasis during abiotic stress conditions. Owing to its immense metabolic potential, the phyto-microbiome provides the host plant with the capability to mitigate the abiotic stress through various mechanisms like production of antioxidants, plant growth hormones, bioactive compounds, detoxification of harmful chemicals and toxins, sequestration of reactive oxygen species and other free radicals. A deeper understanding of the structure and functions of the phyto-microbiome and the complex mechanisms of phyto-microbiome mediated abiotic stress mitigation would enable its utilization for abiotic stress alleviation of crop plants and development of stress-resistant crops. This review aims at exploring the potential of phyto-microbiome to alleviate drought, heat, salinity and heavy metal stress in crop plants and finding sustainable solutions to enhance the agricultural productivity. The mechanistic insights into the role of phytomicrobiome in imparting abiotic stress tolerance to plants have been summarized, that would be helpful in the development of novel bioinoculants. The high-throughput modern approaches involving candidate gene identification and target gene modification such as genomics, metagenomics, transcriptomics, metabolomics, and phyto-microbiome based genetic engineering have been discussed in wake of the ever-increasing demand of climate resilient crop plants.
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Affiliation(s)
- Anamika Singh
- Department of Botany, Maitreyi College, University of Delhi, New Delhi, India
| | - Samina Mazahar
- Department of Botany, Dyal Singh College, University of Delhi, New Delhi, India
| | - Shilpa Samir Chapadgaonkar
- Department of Biosciences and Technology, Dr. Vishwanath Karad MIT World Peace University, Pune, Maharashtra, India
| | - Priti Giri
- Department of Botany, Maitreyi College, University of Delhi, New Delhi, India
| | - Abhilasha Shourie
- Department of Biotechnology, Faculty of Engineering and Technology, Manav Rachna International Institute of Research and Studies, Faridabad, India
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9
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Ahmad M, Ahmed S, Yasin NA, Wahid A, Sardar R. Exogenous application of glutathione enhanced growth, nutritional orchestration and physiochemical characteristics of Brassica oleracea L. under lead stress. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2023; 29:1103-1116. [PMID: 37829699 PMCID: PMC10564701 DOI: 10.1007/s12298-023-01346-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 08/08/2023] [Accepted: 08/10/2023] [Indexed: 10/14/2023]
Abstract
A major obstacle to agricultural production and yield quality is heavy metal contamination of the soil and water, which leads to lower productivity and quality of crops. The situation has significantly worsened as a result of the growing population and subsequent rise in food consumption. The growth of nutrient-rich plants is hampered by lead (Pb) toxicity in the soil. Brassica oleracea L. (broccoli) is a prominent vegetable crop in the Brassicaceae family subjected to a number of biotic and abiotic stresses that dramatically lower crop yields. Seed priming is a novel, practicable, and cost-effective method that can improve various abiotic stress tolerances. Many plant metabolic activities depend on the antioxidant enzyme glutathione (GSH), which also chelates heavy metals. Keeping in view the stress mitigation potential of GSH, current research work was designed to inspect the beneficial role of seed priming with GSH on the growth, morphological and gas exchange attributes of broccoli seedlings under Pb stress. For this purpose, broccoli seeds were primed with 25, 50, and 75 µM L-1 GSH. Plant growth and photosynthetic activity were adversely affected by Pb stress. Furthermore, Pb stress enhanced proline levels along with reduced protein and phenol content. The application of GSH improved growth traits, total soluble proteins, chlorophyll content, mineral content, and gas exchange parameters. The involvement of GSH in reducing Pb concentrations was demonstrated by an improved metal tolerance index and lower Pb levels in broccoli plants. The results of the current study suggest that GSH can be used as a strategy to increase broccoli tolerance to Pb by enhancing nutrient uptake, growth and proline.
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Affiliation(s)
- Maria Ahmad
- Institute of Botany, University of the Punjab, Lahore, Pakistan
| | - Shakil Ahmed
- Institute of Botany, University of the Punjab, Lahore, Pakistan
| | | | - Abdul Wahid
- Department of Environmental Sciences, Bahauddin Zakariya University, Multan, Pakistan
| | - Rehana Sardar
- Institute of Botany, University of the Punjab, Lahore, Pakistan
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10
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Aloo BN, Dessureault-Rompré J, Tripathi V, Nyongesa BO, Were BA. Signaling and crosstalk of rhizobacterial and plant hormones that mediate abiotic stress tolerance in plants. Front Microbiol 2023; 14:1171104. [PMID: 37455718 PMCID: PMC10347528 DOI: 10.3389/fmicb.2023.1171104] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 06/15/2023] [Indexed: 07/18/2023] Open
Abstract
Agricultural areas exhibiting numerous abiotic stressors, such as elevated water stress, temperatures, and salinity, have grown as a result of climate change. As such, abiotic stresses are some of the most pressing issues in contemporary agricultural production. Understanding plant responses to abiotic stressors is important for global food security, climate change adaptation, and improving crop resilience for sustainable agriculture, Over the decades, explorations have been made concerning plant tolerance to these environmental stresses. Plant growth-promoting rhizobacteria (PGPR) and their phytohormones are some of the players involved in developing resistance to abiotic stress in plants. Several studies have investigated the part of phytohormones in the ability of plants to withstand and adapt to non-living environmental factors, but very few have focused on rhizobacterial hormonal signaling and crosstalk that mediate abiotic stress tolerance in plants. The main objective of this review is to evaluate the functions of PGPR phytohormones in plant abiotic stress tolerance and outline the current research on rhizobacterial hormonal communication and crosstalk that govern plant abiotic stress responses. The review also includes the gene networks and regulation under diverse abiotic stressors. The review is important for understanding plant responses to abiotic stresses using PGPR phytohormones and hormonal signaling. It is envisaged that PGPR offer a useful approach to increasing plant tolerance to various abiotic stresses. However, further studies can reveal the unclear patterns of hormonal interactions between plants and rhizobacteria that mediate abiotic stress tolerance.
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Affiliation(s)
- B. N. Aloo
- Department of Biological Sciences, University of Eldoret, Eldoret, Kenya
| | | | - V. Tripathi
- Department of Biotechnology, Graphic Era (Deemed to be University), Dehradun, Uttarakhand, India
| | - B. O. Nyongesa
- Department of Biological Sciences, University of Eldoret, Eldoret, Kenya
| | - B. A. Were
- Department of Biological Sciences, University of Eldoret, Eldoret, Kenya
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11
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Watts D, Palombo EA, Jaimes Castillo A, Zaferanloo B. Endophytes in Agriculture: Potential to Improve Yields and Tolerances of Agricultural Crops. Microorganisms 2023; 11:1276. [PMID: 37317250 DOI: 10.3390/microorganisms11051276] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 05/08/2023] [Accepted: 05/10/2023] [Indexed: 06/16/2023] Open
Abstract
Endophytic fungi and bacteria live asymptomatically within plant tissues. In recent decades, research on endophytes has revealed that their significant role in promoting plants as endophytes has been shown to enhance nutrient uptake, stress tolerance, and disease resistance in the host plants, resulting in improved crop yields. Evidence shows that endophytes can provide improved tolerances to salinity, moisture, and drought conditions, highlighting the capacity to farm them in marginal land with the use of endophyte-based strategies. Furthermore, endophytes offer a sustainable alternative to traditional agricultural practices, reducing the need for synthetic fertilizers and pesticides, and in turn reducing the risks associated with chemical treatments. In this review, we summarise the current knowledge on endophytes in agriculture, highlighting their potential as a sustainable solution for improving crop productivity and general plant health. This review outlines key nutrient, environmental, and biotic stressors, providing examples of endophytes mitigating the effects of stress. We also discuss the challenges associated with the use of endophytes in agriculture and the need for further research to fully realise their potential.
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Affiliation(s)
- Declan Watts
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Alex Jaimes Castillo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Bita Zaferanloo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
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12
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Jalal A, Oliveira CEDS, Rosa PAL, Galindo FS, Teixeira Filho MCM. Beneficial Microorganisms Improve Agricultural Sustainability under Climatic Extremes. Life (Basel) 2023; 13:life13051102. [PMID: 37240747 DOI: 10.3390/life13051102] [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: 02/26/2023] [Revised: 04/08/2023] [Accepted: 04/24/2023] [Indexed: 05/28/2023] Open
Abstract
The challenging alterations in climate in the last decades have had direct and indirect influences on biotic and abiotic stresses that have led to devastating implications on agricultural crop production and food security. Extreme environmental conditions, such as abiotic stresses, offer great opportunities to study the influence of different microorganisms in plant development and agricultural productivity. The focus of this review is to highlight the mechanisms of plant growth-promoting microorganisms (especially bacteria and fungi) adapted to environmental induced stresses such as drought, salinity, heavy metals, flooding, extreme temperatures, and intense light. The present state of knowledge focuses on the potential, prospective, and biotechnological approaches of plant growth-promoting bacteria and fungi to improve plant nutrition, physio-biochemical attributes, and the fitness of plants under environmental stresses. The current review focuses on the importance of the microbial community in improving sustainable crop production under changing climatic scenarios.
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Affiliation(s)
- Arshad Jalal
- Department of Plant Health, Rural Engineering and Soils, Faculty of Engineering, São Paulo State University (UNESP), Av. Brasil 56-Centro, Ilha Solteira 15385-000, SP, Brazil
| | - Carlos Eduardo da Silva Oliveira
- Department of Plant Health, Rural Engineering and Soils, Faculty of Engineering, São Paulo State University (UNESP), Av. Brasil 56-Centro, Ilha Solteira 15385-000, SP, Brazil
| | - Poliana Aparecida Leonel Rosa
- Department of Plant Health, Rural Engineering and Soils, Faculty of Engineering, São Paulo State University (UNESP), Av. Brasil 56-Centro, Ilha Solteira 15385-000, SP, Brazil
| | - Fernando Shintate Galindo
- Faculty of Agricultural Sciences and Technology, São Paulo State University (UNESP), Campus of Dracena, Sao Paulo 17900-000, SP, Brazil
| | - Marcelo Carvalho Minhoto Teixeira Filho
- Department of Plant Health, Rural Engineering and Soils, Faculty of Engineering, São Paulo State University (UNESP), Av. Brasil 56-Centro, Ilha Solteira 15385-000, SP, Brazil
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Devi R, Verma R, Dhalaria R, Kumar A, Kumar D, Puri S, Thakur M, Chauhan S, Chauhan PP, Nepovimova E, Kuca K. A systematic review on endophytic fungi and its role in the commercial applications. PLANTA 2023; 257:70. [PMID: 36856911 DOI: 10.1007/s00425-023-04087-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 02/02/2023] [Indexed: 06/18/2023]
Abstract
MAIN CONCLUSION EF have been explored for its beneficial impact on environment and for its commercial applications. It has proved its worth in these sectors and showed an impact on biological properties of plants by producing various bioactive molecules and enzymes. Endophytes are plant mutualists that live asymptomatically within plant tissues and exist in almost every plant species. Endophytic fungi benefit from the host plant nutrition, and the host plant gains improved competitive abilities and tolerance against pathogens, herbivores, and various abiotic stresses. Endophytic fungi are one of the most inventive classes which produce secondary metabolites and play a crucial role in human health and other biotic aspects. This review is focused on systematic study on the biodiversity of endophytic fungi in plants, and their role in enhancing various properties of plants such as antimicrobial, antimycobacterial, antioxidant, cytotoxic, anticancer, and biological activity of secondary metabolites produced by various fungal endophytes in host plants reported from 1994 to 2021. This review emphasizes the endophytic fungal population shaped by host genotype, environment, and endophytic fungi genotype affecting host plant. The impact of endophytic fungi has been discussed in detail which influences the commercial properties of plants. Endophytes also have an influence on plant productivity by increasing parameters such as nutrient recycling and phytostimulation. Studies focusing on mechanisms that regulate attenuation of secondary metabolite production in EF would provide much needed impetus on ensuring continued production of bioactive molecules from a indubitable source. If this knowledge is further extensively explored regarding fungal endophytes in plants for production of potential phytochemicals, then it will help in exploring a keen area of interest for pharmacognosy.
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Affiliation(s)
- Reema Devi
- School of Biological and Environmental Sciences, Shoolini University of Biotechnology and Management Sciences, Solan, H.P., 173229, India
| | - Rachna Verma
- School of Biological and Environmental Sciences, Shoolini University of Biotechnology and Management Sciences, Solan, H.P., 173229, India.
| | - Rajni Dhalaria
- School of Biological and Environmental Sciences, Shoolini University of Biotechnology and Management Sciences, Solan, H.P., 173229, India
| | - Ashwani Kumar
- Patanjali Herbal Research Department, Patanjali Research Institute, Haridwar, Uttarakhand, 249405, India
| | - Dinesh Kumar
- School of Bioengineering and Food Technology, Shoolini University of Biotechnology and Business Management, Solan, H.P., 173229, India
| | - Sunil Puri
- School of Biological and Environmental Sciences, Shoolini University of Biotechnology and Management Sciences, Solan, H.P., 173229, India
| | - Monika Thakur
- School of Biological and Environmental Sciences, Shoolini University of Biotechnology and Management Sciences, Solan, H.P., 173229, India
| | - Saurav Chauhan
- School of Biological and Environmental Sciences, Shoolini University of Biotechnology and Management Sciences, Solan, H.P., 173229, India
| | - Prem Parkash Chauhan
- Lal Bahadur Shastri Government Degree College, Saraswati Nagar, Shimla, H.P., 171206, India
| | - Eugenie Nepovimova
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, 50003, Hradec Kralove, Czech Republic
| | - Kamil Kuca
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, 50003, Hradec Kralove, Czech Republic.
- Biomedical Research Center, University Hospital Hradec Kralove, 50005, Hradec Kralove, Czech Republic.
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14
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Khanal M, Bhatta BP, Timilsina S, Ghimire S, Cochran K, Malla S. Curtobacterium allii sp. nov., the actinobacterial pathogen causing onion bulb rot. Antonie Van Leeuwenhoek 2023; 116:83-96. [PMID: 36100777 DOI: 10.1007/s10482-022-01775-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 09/06/2022] [Indexed: 02/01/2023]
Abstract
A Gram-stain-positive, aerobic, and non-spore-forming bacterial strain, 20TX0166T, was isolated from a diseased onion bulb in Texas, USA. Upon testing its pathogenicity on onion bulb, it produced pathogenic response which makes it first species of pathogen belonging to the phylum actinobacteria detected in onion. Phylogenetic analysis of the 16S rRNA gene sequence revealed that the strain belonged to the genus Curtobacterium and was most similar to Curtobacterium flaccumfaciens LMG 3645T (100%), C. pusillum DSM 20527T (99.5%), and C. oceanosedimentum ATCC 31317T (99.5%). The estimated genome size of the novel species was 4.0 Mbp with a G + C content of 70.8%. The orthologous ANI (orthoANIu), ANI based on blast (ANIb), and dDDH values between the novel strain and the closest relative, C. flaccumfaciens LMG 3645T, were 95.7%, 95.4%, and 63.3%, respectively. These values were below the recommended species cut-off threshold of 96% (ANI) and 70% (dDDH), suggesting the strain may be a novel species. Physiologic and phenotypic characters of this novel strain were also unique when compared with the closely related species. The major cellular fatty acids of this strain were anteiso-C15:0 and anteiso-C17:0. Using a polyphasic approach based on phenotypic and genotypic analyses, strain 20TX0166T represents a novel species of the genus Curtobacterium, and the name Curtobacterium allii sp. nov. is proposed. The type strain is 20TX0166T (= LMG 32517T = CIP112023T = NCIMB 15427T).
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Affiliation(s)
- Manzeal Khanal
- Department of Horticultural Sciences, Texas A&M University, College Station, TX, 77843, USA.,Texas A&M AgriLife Research and Extension Centre, Uvalde, TX, 78801, USA
| | - Bed Prakash Bhatta
- Department of Horticultural Sciences, Texas A&M University, College Station, TX, 77843, USA.,Texas A&M AgriLife Research and Extension Centre, Uvalde, TX, 78801, USA
| | - Sujan Timilsina
- Department of Plant Pathology, University of Florida, Gainesville, FL, 32611, USA.,Charles River Laboratories, Newark, DE, USA
| | - Sudeep Ghimire
- Department of Pathology, University of Iowa, Iowa City, IA, 54442, USA
| | - Kimberly Cochran
- Texas A&M AgriLife Research and Extension Centre, Uvalde, TX, 78801, USA.,Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX, 77843, USA
| | - Subas Malla
- Department of Horticultural Sciences, Texas A&M University, College Station, TX, 77843, USA. .,Texas A&M AgriLife Research and Extension Centre, Uvalde, TX, 78801, USA.
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15
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Kaushal P, Ali N, Saini S, Pati PK, Pati AM. Physiological and molecular insight of microbial biostimulants for sustainable agriculture. FRONTIERS IN PLANT SCIENCE 2023; 14:1041413. [PMID: 36794211 PMCID: PMC9923114 DOI: 10.3389/fpls.2023.1041413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2022] [Accepted: 01/13/2023] [Indexed: 06/18/2023]
Abstract
Increased food production to cater the need of growing population is one of the major global challenges. Currently, agro-productivity is under threat due to shrinking arable land, increased anthropogenic activities and changes in the climate leading to frequent flash floods, prolonged droughts and sudden fluctuation of temperature. Further, warm climatic conditions increase disease and pest incidences, ultimately reducing crop yield. Hence, collaborated global efforts are required to adopt environmentally safe and sustainable agro practices to boost crop growth and productivity. Biostimulants appear as a promising means to improve growth of plants even under stressful conditions. Among various categories of biostimulants, microbial biostimulants are composed of microorganisms such as plant growth-promoting rhizobacteria (PGPR) and/or microbes which stimulate nutrient uptake, produce secondary metabolites, siderophores, hormones and organic acids, participate in nitrogen fixation, imparts stress tolerance, enhance crop quality and yield when applied to the plants. Though numerous studies convincingly elucidate the positive effects of PGPR-based biostimulants on plants, yet information is meagre regarding the mechanism of action and the key signaling pathways (plant hormone modulations, expression of pathogenesis-related proteins, antioxidants, osmolytes etc.) triggered by these biostimulants in plants. Hence, the present review focuses on the molecular pathways activated by PGPR based biostimulants in plants facing abiotic and biotic challenges. The review also analyses the common mechanisms modulated by these biostimulants in plants to combat abiotic and biotic stresses. Further, the review highlights the traits that have been modified through transgenic approach leading to physiological responses akin to the application of PGPR in the target plants.
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Affiliation(s)
- Priya Kaushal
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, HP, India
| | - Nilofer Ali
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, HP, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Shivani Saini
- Department of Botany, Goswami Ganesh Dutta Sanatan Dharma College, Chandigarh, India
| | - Pratap Kumar Pati
- Department of Biotechnology, Guru Nanak Dev University, Amritsar, Punjab, India
| | - Aparna Maitra Pati
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, HP, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
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Kumawat KC, Sharma B, Nagpal S, Kumar A, Tiwari S, Nair RM. Plant growth-promoting rhizobacteria: Salt stress alleviators to improve crop productivity for sustainable agriculture development. FRONTIERS IN PLANT SCIENCE 2023; 13:1101862. [PMID: 36714780 PMCID: PMC9878403 DOI: 10.3389/fpls.2022.1101862] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Accepted: 12/16/2022] [Indexed: 06/12/2023]
Abstract
Soil salinity, a growing issue worldwide, is a detrimental consequence of the ever-changing climate, which has highlighted and worsened the conditions associated with damaged soil quality, reduced agricultural production, and decreasing land areas, thus resulting in an unsteady national economy. In this review, halo-tolerant plant growth-promoting rhizo-microbiomes (PGPRs) are evaluated in the salinity-affected agriculture as they serve as excellent agents in controlling various biotic-abiotic stresses and help in the augmentation of crop productivity. Integrated efforts of these effective microbes lighten the load of agro-chemicals on the environment while managing nutrient availability. PGPR-assisted modern agriculture practices have emerged as a green strategy to benefit sustainable farming without compromising the crop yield under salinity as well as salinity-affected supplementary stresses including increased temperature, drought, salinity, and potential invasive plant pathogenicity. PGPRs as bio-inoculants impart induced systemic tolerance (IST) to plants by the production of volatile organic compounds (VOCs), antioxidants, osmolytes, extracellular polymeric substances (EPS), phytohormones, and ACC-deaminase and recuperation of nutritional status and ionic homeostasis. Regulation of PGPR-induced signaling pathways such as MAPK and CDPK assists in salinity stress alleviation. The "Next Gen Agriculture" consists of the application of designer crop microbiomes through gene editing tools, for instance, CRISPR, and engineering of the metabolic pathways of the microbes so as to gain maximum plant resistance. The utilization of omics technologies over the traditional approaches can fulfill the criteria required to increase crop yields in a sustainable manner for feeding the burgeoning population and augment plant adaptability under climate change conditions, ultimately leading to improved vitality. Furthermore, constraints such as the crop specificity issue of PGPR, lack of acceptance by farmers, and legal regulatory aspects have been acknowledged while also discussing the future trends for product commercialization with the view of the changing climate.
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Affiliation(s)
- Kailash Chand Kumawat
- Department of Industrial Microbiology, Jacob Institute of Biotechnology and Bioengineering, Sam Higginbottom University of Agriculture, Technology and Sciences (SHUATS), Prayagraj, Uttar Pradesh, India
| | - Barkha Sharma
- Department of Microbiology, G. B. Pant University of Agriculture & Technology, Pantnagar, Uttarakhand, India
| | - Sharon Nagpal
- Department of Microbiology, Punjab Agricultural University, Ludhiana, Punjab, India
| | - Ajay Kumar
- Department of Industrial Microbiology, Jacob Institute of Biotechnology and Bioengineering, Sam Higginbottom University of Agriculture, Technology and Sciences (SHUATS), Prayagraj, Uttar Pradesh, India
| | - Shalini Tiwari
- Department of Microbiology, G. B. Pant University of Agriculture & Technology, Pantnagar, Uttarakhand, India
| | - Ramakrishnan Madhavan Nair
- World Vegetable Centre, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India
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Naamala J, Msimbira LA, Subramanian S, Smith DL. Lactobacillus helveticus EL2006H cell-free supernatant enhances growth variables in Zea mays (maize), Glycine max L. Merill (soybean) and Solanum tuberosum (potato) exposed to NaCl stress. Front Microbiol 2023; 13:1075633. [PMID: 36704564 PMCID: PMC9871818 DOI: 10.3389/fmicb.2022.1075633] [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: 10/20/2022] [Accepted: 12/12/2022] [Indexed: 01/11/2023] Open
Abstract
Plant growth promoting microorganisms and their derived compounds, such as cell-free supernatant (CFS), enhance plant growth under stressed and non stressed conditions. Such technology is sustainable and environmentally friendly, which is desirable amidst the climate change threat. The current study evaluated the effect of CFS obtained from Lactobacillus helveticus EL2006H on its ability to enhance mean percentage germination and mean radicle length of corn and soybean, as well as growth parameters of potato, using treatment formulations that consisted of 0.2 and 1.0% [v/v] L. helveticus EL2006H CFS concentrations and 100 mM NaCl and 150 mM NaCl levels. Results show that treatment with 100 mM NaCl lowered percentage germination of corn by 52.63%, at 72 h, and soybean by 50%, at 48 h. Treatment with 100 NaCl +0.2% EL2006H enhanced percentage germination of soybean by 44.37%, at 48 h, in comparison to that of the 100 mM NaCl control. One hundred mM NaCl lowered radicle length of corn and soybean by 38.58 and 36.43%, respectively. Treatment with 100 Mm NaCl +1.0% EL2006H significantly increased radicle length of corn by 23.04%. Treatment with 100 mM NaCl +0.2% EL2006H significantly increased photosynthetic rate, leaf greenness and fresh weight of potato. Increasing NaCl concentration to 150 NaCl lowered the effectiveness of the 0.2% EL2006H CFS on the same growth variables of potato. In general, the lower CFS concentration of 0.2% was more efficient at enhancing germination in soybean while the higher concentration of 1.0% was more efficient at enhancing radicle length of corn. There was an observed variation in the effectiveness of L. helveticus EL2006H CFS across the different CFS concentrations, NaCl levels and crop species studied. In conclusion, based on findings of this study, CFS obtained from L. helveticus can be used as a bio stimulant to enhance growth of corn, soybean and potato. However, further studies need to be conducted, for validation, especially under field conditions, for commercial application.
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Shaffique S, Imran M, Kang SM, Khan MA, Asaf S, Kim WC, Lee IJ. Seed Bio-priming of wheat with a novel bacterial strain to modulate drought stress in Daegu, South Korea. FRONTIERS IN PLANT SCIENCE 2023; 14:1118941. [PMID: 37180396 PMCID: PMC10173886 DOI: 10.3389/fpls.2023.1118941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 03/09/2023] [Indexed: 05/16/2023]
Abstract
Wheat is one of the major cereal crop grown food worldwide and, therefore, plays has a key role in alleviating the global hunger crisis. The effects of drought stress can reduces crop yields by up to 50% globally. The use of drought-tolerant bacteria for biopriming can improve crop yields by countering the negative effects of drought stress on crop plants. Seed biopriming can reinforce the cellular defense responses to stresses via the stress memory mechanism, that its activates the antioxidant system and induces phytohormone production. In the present study, bacterial strains were isolated from rhizospheric soil taken from around the Artemisia plant at Pohang Beach, located near Daegu, in the South Korea Republic of Korea. Seventy-three isolates were screened for their growth-promoting attributes and biochemical characteristics. Among them, the bacterial strain SH-8 was selected preferred based on its plant growth-promoting bacterial traits, which are as follows: abscisic acid (ABA) concentration = 1.08 ± 0.05 ng/mL, phosphate-solubilizing index = 4.14 ± 0.30, and sucrose production = 0.61 ± 0.13 mg/mL. The novel strain SH-8 demonstrated high tolerance oxidative stress. The antioxidant analysis also showed that SH-8 contained significantly higher levels of catalase (CAT), superoxide dismutase (SOD), and ascorbic peroxidase (APX). The present study also quantified and determined the effects of biopriming wheat (Triticum aestivum) seeds with the novel strain SH-8. SH-8 was highly effective in enhancing the drought tolerance of bioprimed seeds; their drought tolerance and germination potential (GP) were increased by up to 20% and 60%, respectively, compared with those in the control group. The lowest level of impact caused by drought stress and the highest germination potential, seed vigor index (SVI), and germination energy (GE) (90%, 2160, and 80%, respectively), were recorded for seeds bioprimed with with SH-8. These results show that SH-8 enhances drought stress tolerance by up to 20%. Our study suggests that the novel rhizospheric bacterium SH-8 (gene accession number OM535901) is a valuable biostimulant that improves drought stress tolerance in wheat plants and has the potential to be used as a biofertilizer under drought conditions.
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Affiliation(s)
- Shifa Shaffique
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Muhammad Imran
- Biosafety Division, National Institute of Agriculture Science, Rural Development Administration, Jeonju, Republic of Korea
| | - Sang-Mo Kang
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Muhammad Aaqil Khan
- Department of Chemical and Life Sciences, Qurtuba University of Science and Information Technology, Peshawar, Pakistan
| | - Sajjad Asaf
- Natural and Medical Sciences Research Center, University of Nizwa, Nizwa, Oman
| | - Won-Chan Kim
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
- *Correspondence: Won-Chan Kim, ; In-Jung Lee,
| | - In-Jung Lee
- Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
- *Correspondence: Won-Chan Kim, ; In-Jung Lee,
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Seckin Dinler B, Cetinkaya H, Secgin Z. The regulation of glutathione s-transferases by gibberellic acid application in salt treated maize leaves. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2023; 29:69-85. [PMID: 36733837 PMCID: PMC9886772 DOI: 10.1007/s12298-022-01269-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 12/13/2022] [Accepted: 12/14/2022] [Indexed: 06/18/2023]
Abstract
Plant hormones and antioxidant system changes occur during plants' exposure to stress conditions. Although the interactions of some plant hormones (abscisic acid, salicylic acid, jasmonic acid, nitric oxide, and ethylene) with the glutathione s-transferase (GST) enzyme, which is one of the antioxidant enzymes, have already been reported, the influence of gibberellic acid (GA3) on this enzyme under saline conditions has not yet been reported. Plant material for the experiments was obtained from M14G144 cultivar of maize (Zea mays L.) plants grown as a soil culture in growth chambers at 22 °C, 65-70% moisture, 16-h light/8-h dark conditions, and with full strength Hoagland solution for 8 days under controlled growth conditions. Then, the plants were exposed to salt stress (350 mM NaCl and 100, 300, and 500 ppm GA3) simultaneously. In maize leaves, GA3 treatment alleviated the physiological parameters under salt stress. Specifically, the treatments with 100 and 500 ppm of GA3 were able to trigger GST enzyme and isoenzyme activities as well as hydrogen sulfide accumulation and anthocyanin content, although the lowest malondialdehyde, hydrogen peroxide, and superoxide radical content were under the treatment of 300 ppm of GA3. Besides this, GST gene expression levels were found to be upregulated between 1.5 and fourfold higher in all the plants treated with GA3 at different concentrations in proportion to salt stress. These results first indicated that the reason for the changes in GA3-treated plants was the stimulating role of this hormone to maintain GST regulation in maize plants. Supplementary Information The online version contains supplementary material available at 10.1007/s12298-022-01269-2.
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Affiliation(s)
- Burcu Seckin Dinler
- Department of Biology, Faculty of Arts and Sciences, Sinop University, Sinop, Turkey
| | - Hatice Cetinkaya
- Department of Biology, Faculty of Arts and Sciences, Sinop University, Sinop, Turkey
| | - Zafer Secgin
- Department of Agricultural Biotechnology, Ondokuz Mayıs University, Samsun, Turkey
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Applications of Molecular Markers for Developing Abiotic-Stress-Resilient Oilseed Crops. LIFE (BASEL, SWITZERLAND) 2022; 13:life13010088. [PMID: 36676037 PMCID: PMC9867252 DOI: 10.3390/life13010088] [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: 11/27/2022] [Revised: 12/23/2022] [Accepted: 12/25/2022] [Indexed: 12/29/2022]
Abstract
Globally, abiotic stresses, such as temperature (heat or cold), water (drought and flooding), and salinity, cause significant losses in crop production and have adverse effects on plant growth and development. A variety of DNA-based molecular markers, such as SSRs, RFLPs, AFLPs, SNPs, etc., have been used to screen germplasms for stress tolerance and the QTL mapping of stress-related genes. Such molecular-marker-assisted selection strategies can quicken the development of tolerant/resistant cultivars to withstand abiotic stresses. Oilseeds such as rapeseed, mustard, peanuts, soybeans, sunflower, safflower, sesame, flaxseed, and castor are the most important source of edible oil worldwide. Although oilseed crops are known for their capacity to withstand abiotic challenges, there is a significant difference between actual and potential yields due to the adaptation and tolerance to severe abiotic pressures. This review summarizes the applications of molecular markers to date to achieve abiotic stress tolerance in major oilseed crops. The molecular markers that have been reported for genetic diversity studies and the mapping and tagging of genes/QTLs for drought, heavy metal stress, salinity, flooding, cold and heat stress, and their application in the MAS are presented.
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Ahmed S, Ahmad M, Sardar R, Ismail MA. Triacontanol priming as a smart strategy to attenuate lead toxicity in Brassica oleracea L. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2022; 25:1173-1188. [PMID: 36384370 DOI: 10.1080/15226514.2022.2143478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The most prevalent heavy metal pollutant in the environment is lead (Pb). Lead potentially contribute 10% of overall heavy metal contamination. Lead uptake by plants has been found to have an impact on their metabolic functions, photosynthetic activity, growth, and productivity. The current experiment was conducted to investigate the impact of triacontanol (Tria) for attenuating Pb stress in Brassica oleracea var. italic (broccoli). Three different Tria concentrations (10, 20 and 30 µmol L-1) were used to prime broccoli seeds. Growth of broccoli was reduced when exposed to Pb-driven toxicity. Additionally, Pb had a deleterious impact on the protein quantity, stomatal conductance, transpiration and photosynthetic rate. Nevertheless, plants grown from seeds primed with Tria2 (20 µmol L-1 Tria) exhibited improved morphological characteristics, uptake of mineral content (Mn+2, Zn+2, K+1, Na+1) along with biomass production. There was 1.6-fold increase in photosynthetic rate, the phenol (1.3 folds), and DPPH activity (1.2 folds) in seed primed with Tria2. Additionally, plants treated with Tria2 demonstrated enhanced MTI and gas exchange characteristics that improves plant stress tolerance under Pb stress. Seed priming with Tria can be used to increase plant tolerance to Pb stress as evidenced by the improved growth and biochemical characteristics of broccoli seedlings.
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Affiliation(s)
- Shakil Ahmed
- Institute of Botany, University of the Punjab, Lahore, Pakistan
| | - Maria Ahmad
- Institute of Botany, University of the Punjab, Lahore, Pakistan
| | - Rehana Sardar
- Institute of Botany, University of the Punjab, Lahore, Pakistan
| | - Muhammad Amir Ismail
- Department of Information Technology, Lahore Institute of Technical Education (LITE), Lahore Cantt, Pakistan
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Fadiji AE, Orozco-Mosqueda MDC, Santos-Villalobos SDL, Santoyo G, Babalola OO. Recent Developments in the Application of Plant Growth-Promoting Drought Adaptive Rhizobacteria for Drought Mitigation. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11223090. [PMID: 36432820 PMCID: PMC9698351 DOI: 10.3390/plants11223090] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 11/03/2022] [Accepted: 11/07/2022] [Indexed: 05/21/2023]
Abstract
Drought intensity that has increased as a result of human activity and global warming poses a serious danger to agricultural output. The demand for ecologically friendly solutions to ensure the security of the world's food supply has increased as a result. Plant growth-promoting rhizobacteria (PGPR) treatment may be advantageous in this situation. PGPR guarantees the survival of the plant during a drought through a variety of processes including osmotic adjustments, improved phytohormone synthesis, and antioxidant activity, among others and these mechanisms also promote the plant's development. In addition, new developments in omics technology have improved our understanding of PGPR, which makes it easier to investigate the genes involved in colonizing plant tissue. Therefore, this review addresses the mechanisms of PGPR in drought stress resistance to summarize the most current omics-based and molecular methodologies for exploring the function of drought-responsive genes. The study discusses a detailed mechanistic approach, PGPR-based bioinoculant design, and a potential roadmap for enhancing their efficacy in combating drought stress.
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Affiliation(s)
- Ayomide Emmanuel Fadiji
- Food Security and Safety Focus Area, Faculty of Natural and Agricultural Sciences, North-West University, Private Bag X2046, Mmabatho 2735, South Africa
| | | | | | - Gustavo Santoyo
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia 58030, Mexico
| | - Olubukola Oluranti Babalola
- Food Security and Safety Focus Area, Faculty of Natural and Agricultural Sciences, North-West University, Private Bag X2046, Mmabatho 2735, South Africa
- Correspondence: ; Tel.: +27-18-389-2568
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Chebotar VK, Chizhevskaya EP, Baganova ME, Keleinikova OV, Yuzikhin OS, Zaplatkin AN, Khonina OV, Kostitsin RD, Lapenko NG. Endophytes from Halotolerant Plants Aimed to Overcome Salinity and Draught. PLANTS (BASEL, SWITZERLAND) 2022; 11:2992. [PMID: 36365445 PMCID: PMC9658857 DOI: 10.3390/plants11212992] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 10/30/2022] [Accepted: 11/03/2022] [Indexed: 06/16/2023]
Abstract
The aim of our research was to study the endosphere of four halophytic plants: Salicornia europaea L., Salsola australis (R.Br.), Bassia sedoides (Pall.) and Kochia prostrata (L.) Schrad. from arid and saline areas of the Stavropol Territory, Russia. In total, 28 endophyte strains were isolated from the roots and stems of these halophytic plants. Most of the isolates (23 out of 28) were identified as Bacillus sp. while others belonged to the genera Oceanobacillus, Paenibacillus, Pantoea, Alcaligenes and Myroides. Three strains of Bacillus sp. (Se5R, Se1-1R, and Se1-3S), isolated from the S. europaea were capable of growth at 55 °C and in 10% of NaCl. Strains Se1-4S, Kp20-2S, and Bs11-2S Bacillus sp. (isolated from the S. australis, K. prostrata and B. sedoides, respectively) demonstrated strong plant growth promoting activity: 85-265% over control lettuce plants and a high degree of growth suppression (59.1-81.2%) of pathogenic fungi Fusarium oxysporum, Bipolaris sorokiniana and Rhizoctonia solani. Selected strains can be promising candidates for the development of bioinoculants to facilitate salt soil phytoremediation and be beneficial for mitigating the salt stress to the plants growing in salt-affected habitats.
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Affiliation(s)
- Vladimir K. Chebotar
- All-Russia Research Institute for Agricultural Microbiology, Podbelskogo hwy, 3, Pushkin, St. Petersburg 196608, Russia
| | - Elena P. Chizhevskaya
- All-Russia Research Institute for Agricultural Microbiology, Podbelskogo hwy, 3, Pushkin, St. Petersburg 196608, Russia
| | - Maria E. Baganova
- All-Russia Research Institute for Agricultural Microbiology, Podbelskogo hwy, 3, Pushkin, St. Petersburg 196608, Russia
| | - Oksana V. Keleinikova
- All-Russia Research Institute for Agricultural Microbiology, Podbelskogo hwy, 3, Pushkin, St. Petersburg 196608, Russia
| | - Oleg S. Yuzikhin
- All-Russia Research Institute for Agricultural Microbiology, Podbelskogo hwy, 3, Pushkin, St. Petersburg 196608, Russia
| | - Alexander N. Zaplatkin
- All-Russia Research Institute for Agricultural Microbiology, Podbelskogo hwy, 3, Pushkin, St. Petersburg 196608, Russia
| | - Olesya V. Khonina
- North Caucasus Federal Scientific Agrarian Center, Federal State Budgetary Scientific Institution, Stavropol Territory, Nikonova str., 49, Shpakovsky District, Mikhailovsk 356241, Russia
| | - Roman D. Kostitsin
- North Caucasus Federal Scientific Agrarian Center, Federal State Budgetary Scientific Institution, Stavropol Territory, Nikonova str., 49, Shpakovsky District, Mikhailovsk 356241, Russia
| | - Nina G. Lapenko
- North Caucasus Federal Scientific Agrarian Center, Federal State Budgetary Scientific Institution, Stavropol Territory, Nikonova str., 49, Shpakovsky District, Mikhailovsk 356241, Russia
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Chauhan PK, Upadhyay SK, Tripathi M, Singh R, Krishna D, Singh SK, Dwivedi P. Understanding the salinity stress on plant and developing sustainable management strategies mediated salt-tolerant plant growth-promoting rhizobacteria and CRISPR/Cas9. Biotechnol Genet Eng Rev 2022:1-37. [PMID: 36254096 DOI: 10.1080/02648725.2022.2131958] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 09/19/2022] [Indexed: 01/09/2023]
Abstract
Soil salinity is a worldwide concern that decreases plant growth performance in agricultural fields and contributes to food scarcity. Salt stressors have adverse impacts on the plant's ionic, osmotic, and oxidative balance, as well as numerous physiological functions. Plants have a variety of coping strategies to deal with salt stress, including osmosensing, osmoregulation, ion-homeostasis, increased antioxidant synthesis, and so on. Not only does salt stress cause oxidative stress but also many types of stress do as well, thus plants have an effective antioxidant system to battle the negative effects of excessive reactive oxygen species produced as a result of stress. Rising salinity in the agricultural field affects crop productivity and plant development considerably; nevertheless, plants have a well-known copying mechanism that shields them from salt stress by facilitated production of secondary metabolites, antioxidants, ionhomeostasis, ABAbiosynthesis, and so on. To address this problem, various environment-friendly solutions such as salt-tolerant plant growth-promoting rhizobacteria, eco-friendly additives, and foliar applications of osmoprotectants/antioxidants are urgently needed. CRISPR/Cas9, a new genetic scissor, has recently been discovered to be an efficient approach for reducing salt stress in plants growing in saline soil. Understanding the processes underlying these physiological and biochemical responses to salt stress might lead to more effective crop yield control measures in the future. In order to address this information, the current review discusses recent advances in plant stress mechanisms against salinity stress-mediated antioxidant systems, as well as the development of appropriate long-term strategies for plant growth mediated by CRISPR/Cas9 techniques under salinity stress.
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Affiliation(s)
- Prabhat K Chauhan
- Department of Environmental Science, V.B.S. Purvanchal University, Jaunpur, India
| | - Sudhir K Upadhyay
- Department of Environmental Science, V.B.S. Purvanchal University, Jaunpur, India
| | - Manikant Tripathi
- Biotechnology Program, Dr. RamManohar Lohia Avadh University, Ayodhya, India
| | - Rajesh Singh
- Guangxi Key Laboratory of Sugarcane Genetic Improvement, Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Deeksha Krishna
- College of agriculture, Fisheries and Forestry, Fiji National University, Fiji
| | - Sushil K Singh
- Department of Agri-Business, V.B.S. Purvanchal University, Jaunpur, India
| | - Padmanabh Dwivedi
- Department of Plant Physiology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, India
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25
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Shahid M, Zeyad MT, Syed A, Singh UB, Mohamed A, Bahkali AH, Elgorban AM, Pichtel J. Stress-Tolerant Endophytic Isolate Priestia aryabhattai BPR-9 Modulates Physio-Biochemical Mechanisms in Wheat ( Triticum aestivum L.) for Enhanced Salt Tolerance. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph191710883. [PMID: 36078599 PMCID: PMC9518148 DOI: 10.3390/ijerph191710883] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Revised: 08/16/2022] [Accepted: 08/24/2022] [Indexed: 05/28/2023]
Abstract
In efforts to improve plant productivity and enhance defense mechanisms against biotic and abiotic stresses, endophytic bacteria have been used as an alternative to chemical fertilizers and pesticides. In the current study, 25 endophytic microbes recovered from plant organs of Triticum aestivum L. (wheat) were assessed for biotic (phyto-fungal pathogens) and abiotic (salinity, drought, and heavy metal) stress tolerance. Among the recovered isolates, BPR-9 tolerated maximum salinity (18% NaCl), drought (15% PEG-6000), and heavy metals (µg mL-1): Cd (1200), Cr (1000), Cu (1000), Pb (800), and Hg (30). Based on phenotypic and biochemical characteristics, as well as 16S rDNA gene sequencing, endophytic isolate BPR-9 was recognized as Priestia aryabhattai (accession no. OM743254.1). This isolate was revealed as a powerful multi-stress-tolerant crop growth promoter after extensive in-vitro testing for plant growth-promoting attributes, nutrient (phosphate, P; potassium, K; and zinc, Zn) solubilization efficiency, extracellular enzyme (protease, cellulase, amylase, lipase, and pectinase) synthesis, and potential for antagonistic activity against important fungal pathogens viz. Alternaria solani, Rhizoctonia solani, Fusarium oxysporum, and Ustilaginoidea virens. At elevated salt levels, increases were noted in indole-3-acetic acid; siderophores; P, K, and Zn-solubilization; ACC deaminase; and ammonia synthesized by Priestia aryabhattai. Additionally, under in-vitro plant bioassays, wheat seedlings inoculated with P. aryabhattai experienced superior growth compared to non-inoculated seedlings in high salinity (0-15% NaCl) environment. Under NaCl stress, germination rate, plant length, vigor indices, and leaf pigments of wheat seedlings significantly increased following P. aryabhattai inoculation. Furthermore, at 2%-NaCl, B. aryabhattai greatly and significantly (p ≤ 0.05) decreased relative leaf water content, membrane damage, and electrolyte leakage compared with the non-inoculated control. Catalase, superoxide dismutase, and peroxidase activity increased by 29, 32, and 21%, respectively, in wheat seedlings exposed to 2% NaCl and inoculated with the bacteria. The present findings demonstrate that endophytic P. aryabhattai strains might be used in the future as a multi-stress reducer and crop growth promoter in agronomically important crops including cereals.
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Affiliation(s)
- Mohammad Shahid
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Mau 275103, India
- Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh 202002, India
| | - Mohammad Tarique Zeyad
- Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh 202002, India
- ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Mau 275103, India
| | - Asad Syed
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Udai B. Singh
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Mau 275103, India
| | - Abdullah Mohamed
- Research Centre, Future University in Egypt, New Cairo 11835, Egypt
| | - Ali H. Bahkali
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Abdallah M. Elgorban
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - John Pichtel
- Natural Resources and Environmental Management, Ball State University, Muncie, IN 47306, USA
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Azeem MA, Shah FH, Ullah A, Ali K, Jones DA, Khan MEH, Ashraf A. Biochemical Characterization of Halotolerant Bacillus safensis PM22 and Its Potential to Enhance Growth of Maize under Salinity Stress. PLANTS 2022; 11:plants11131721. [PMID: 35807673 PMCID: PMC9268828 DOI: 10.3390/plants11131721] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 06/21/2022] [Accepted: 06/22/2022] [Indexed: 11/20/2022]
Abstract
Salinity stress is one of the primary abiotic stresses limiting crop growth and yield. Plants respond to salinity stress with several morphophysiological, molecular, and biochemical mechanisms, however, these mechanisms need to be improved further to cope with salt stress effectively. In this regard, the use of plant growth-promoting (PGP) and halotolerant bacteria is thought to be very efficient for enhancing growth and salinity tolerance in plants. The current study aims to assess Bacillus safensis PM22 for its ability to promote plant growth and resistance to salt. The PM22 produced substantial amounts of exopolysaccharides, indole-3-acetic acid, siderophore, and 1-aminocyclopropane-1-carboxylic acid deaminase (ACC-deaminase) under saline conditions. Additionally, inoculation of the halotolerant bacteria PM22 reduced the severity of salinity stress in plants and increased root and shoot length at various salt concentrations (0, 180, 240, and 300 mM). Furthermore, PM22-inoculated plants showed markedly enhanced photosynthetic pigment, carotenoid, leaf relative water content, 2,2-diphenyl-1-picrylhydrazyl (DPPH) activity, salt tolerance index, total soluble sugar, total protein, and ascorbic acid contents compared to non-inoculated control maize plants. PM22 substantially increased antioxidant (enzymatic and non-enzymatic) activities in maize plants, including ascorbate peroxidase, peroxidase, superoxide dismutase, catalase, total flavonoid, and phenol levels. Maize plants inoculated with PM22 also exhibited a significant reduction in electrolyte leakage, hydrogen peroxide, malondialdehyde, glycine betaine, and proline contents compared to non-inoculated control plants. These physiological appearances were further validated by quantitative reverse transcription-polymerase chain reaction (qRT-PCR), which revealed the upregulation of expression in genes responsible for stress tolerance. In the current investigation, Bacillus safensis PM22 showed plant growth-promoting and salt tolerance attributes and can be utilized as a bio-inoculant to improve yield in salt stress affected areas.
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Affiliation(s)
- Muhammad Atif Azeem
- Department of Plant Sciences, Quaid-i-Azam University, Islamabad 45320, Pakistan; (M.A.A.); (F.H.S.)
| | - Fahim Hussain Shah
- Department of Plant Sciences, Quaid-i-Azam University, Islamabad 45320, Pakistan; (M.A.A.); (F.H.S.)
| | - Abid Ullah
- Botany Department, University of Malakand, Chakdara 18800, Pakistan;
| | - Kishwar Ali
- College of General Education, University of Doha for Science and Technology, Arab League Street, Doha P.O. Box 24449, Qatar;
- Correspondence:
| | - David Aaron Jones
- College of Health Sciences, University of Doha for Science and Technology, Arab League Street, Doha P.O. Box 24449, Qatar;
| | - Muhammad Ezaz Hasan Khan
- College of General Education, University of Doha for Science and Technology, Arab League Street, Doha P.O. Box 24449, Qatar;
| | - Azad Ashraf
- College of Engineering, University of Doha for Science and Technology, Arab League Street, Doha P.O. Box 24449, Qatar;
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Huang Y, Huang B, Shen C, Zhou W, Liao Q, Chen Y, Xin J. Boron supplying alters cadmium retention in root cell walls and glutathione content in Capsicum annuum. JOURNAL OF HAZARDOUS MATERIALS 2022; 432:128713. [PMID: 35316635 DOI: 10.1016/j.jhazmat.2022.128713] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 03/08/2022] [Accepted: 03/13/2022] [Indexed: 06/14/2023]
Abstract
Large areas of farmland in southern China are facing environmental problems such as cadmium (Cd) contamination and boron (B) deficiency. The aim of this study was to investigate the biochemical and molecular mechanisms underlying the reduction in Cd accumulation in hot pepper (Capsicum annuum) by B application. A hydroponic experiment was conducted to compare the subcellular distribution of Cd, transcriptome profile, degree of pectin methylation, and glutathione (GSH) synthesis in the roots of hot pepper under different B and Cd conditions. Boron supply promoted root cell wall biosynthesis and pectin demethylation by upregulating related genes and increasing cell wall Cd concentration by 28%. In addition, with the application of B, the proportion of Cd in root cell walls increased from 27% to 37%. Boron supplementation upregulated sulfur metabolism-related genes but decreased cysteine and GSH contents in the roots. As a result, shoot Cd concentration decreased by 27% due to the decrease in GSH, a critical long-distance transport carrier of Cd. Consequently, B supply could reduce the uptake, translocation, and accumulation of Cd in hot pepper by retaining Cd in the root cell walls and decreasing GSH content.
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Affiliation(s)
- Yingying Huang
- School of Chemical and Environmental Engineering, Hunan Institute of Technology, Hengyang, Hunan Province, China
| | - Baifei Huang
- School of Chemical and Environmental Engineering, Hunan Institute of Technology, Hengyang, Hunan Province, China
| | - Chuang Shen
- School of Chemical and Environmental Engineering, Hunan Institute of Technology, Hengyang, Hunan Province, China
| | - Wenjing Zhou
- School of Chemical and Environmental Engineering, Hunan Institute of Technology, Hengyang, Hunan Province, China
| | - Qiong Liao
- School of Chemical and Environmental Engineering, Hunan Institute of Technology, Hengyang, Hunan Province, China
| | - Yixiang Chen
- School of Chemical and Environmental Engineering, Hunan Institute of Technology, Hengyang, Hunan Province, China
| | - Junliang Xin
- School of Chemical and Environmental Engineering, Hunan Institute of Technology, Hengyang, Hunan Province, China.
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Gul SL, Moon YS, Hamayun M, Khan SA, Iqbal A, Khan MA, Hussain A, Shafique M, Kim YH, Ali S. Porostereum spadiceum-AGH786 Regulates the Growth and Metabolites Production in Triticum aestivum L. Under Salt Stress. Curr Microbiol 2022; 79:159. [PMID: 35416548 DOI: 10.1007/s00284-022-02853-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 03/22/2022] [Indexed: 11/27/2022]
Abstract
The role of the most fungal endophytes in the host plant growth and production of metabolites under stress conditions is still unknown. Fungal endophytes occur in almost all plants to benefit the host plants exposed to biotic and abiotic stress. In the present work, we investigated salt (NaCl) stress alleviation capability of a fungal endophyte (Porostereum spadiceum-AGH786). The culture filtrate (CF: 1.5 mL.) of P. spadiceum-AGH786 contained IAA (158 µg/ml), SA (29.3 µg/ml), proline (114.6 µg/ml), phenols (167.4 µg/ml), lipids (71.4 µg/ml), sugar (133.2 µg/ml), flavonoids (105.04 µg/ml). Smaller amounts of organic acids, such as butyric acid (5.8 µg/ml), formic acid (2.34 µg/ml), succinic acid (2.02 µg/ml), and quinic acid (2.25 µg/ml) were also found in CF of P. spadiceum-AGH786. Similarly, the CF displayed antioxidant activity in 2,2-Diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-Azino-bis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) assays. Moreover, wheat plants colonized by P. spadiceum-AGH786 showed significantly (P = 0.05) higher polyphenol oxidases activity (2.2 mg/g DW) under normal conditions as compared to the NaCl-treated plants. We also observed that P. spadiceum-AGH786 improved biomass (0.30 g) of wheat plants subjected to 140 mM NaCl stress. The results conclude that the wheat plant colonization by P. spadiceum-AGH786 greatly improved the plant growth under 70 mM and 140 mM NaCl stress. Thus, the biomass of the P. Spadiceum-AGH786 can be used in saline soil to help the host plants.
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Affiliation(s)
- Syeda Leeda Gul
- Department of Botany, Abdul Wali Khan University Mardan, Garden Campus, Mardan, Pakistan
| | - Yong-Sun Moon
- Department of Horticulture and Life Sciences, Yeungnam University, Gyeongsan-si, Republic of Korea
| | - Muhammad Hamayun
- Department of Botany, Abdul Wali Khan University Mardan, Garden Campus, Mardan, Pakistan.
| | - Sumera Afzal Khan
- Centre of Biotechnology and Microbiology, University of Peshawar, Peshawar, Pakistan
| | - Amjad Iqbal
- Department of Food Science and Technology, Abdul Wali Khan University Mardan, Garden Campus, Mardan, Pakistan
| | - Muhammad Aaqil Khan
- School of Applied Biosciences College of Agriculture and Life-Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Anwar Hussain
- Department of Botany, Abdul Wali Khan University Mardan, Garden Campus, Mardan, Pakistan
| | - Maryam Shafique
- Department of Microbiology, Federal Urdu University of Art Science & Technology, Karachi, Pakistan
| | - Yoon-Ha Kim
- School of Applied Biosciences College of Agriculture and Life-Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Sajid Ali
- Department of Horticulture and Life Sciences, Yeungnam University, Gyeongsan-si, Republic of Korea.
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Chandwani S, Amaresan N. Role of ACC deaminase producing bacteria for abiotic stress management and sustainable agriculture production. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:22843-22859. [PMID: 35050477 DOI: 10.1007/s11356-022-18745-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 01/14/2022] [Indexed: 06/14/2023]
Abstract
Plants are immobile and are exposed to various biotic and abiotic stresses, including heat, cold, drought, flooding, nutrient deficiency, heavy metal exposure, phytopathogens, and pest attacks. The stressors significantly affect agricultural productivity when exceed a certain threshold. It has been reported that most of the stressed plants are reported to have increased ethylene synthesis from its precursor 1-aminocyclopropane-1-carboxylic acid (ACC). Ethylene is a plant hormone that plays a vital role in the regulation of various physiological processes, such as respiration, nitrogen fixation, and photosynthesis. The increment in the plant hormone ethylene would reduce plant growth and development, and if the ethylene level increased beyond the limit, it could also result in plant death. Therefore, plant growth-promoting bacteria (PGPB) possessing ACC deaminase activity play an essential role in the management of biotic and abiotic stresses by hydrolysing 1-aminocyclopropane-1-carboxylic acid using ACC deaminase. In this review, the importance of ACC deaminase-producing bacteria in promoting plant growth under various abiotic stressors is discussed.
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Affiliation(s)
- Sapna Chandwani
- C. G. Bhakta Institute of Biotechnology, Uka Tarsadia University, Maliba Campus, Bardoli- 394 350, Surat, Gujarat, India
| | - Natarajan Amaresan
- C. G. Bhakta Institute of Biotechnology, Uka Tarsadia University, Maliba Campus, Bardoli- 394 350, Surat, Gujarat, India.
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Salt Stress Tolerance-Promoting Proteins and Metabolites under Plant-Bacteria-Salt Stress Tripartite Interactions. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12063126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The rapid increase in soil salinization has impacted agricultural output and poses a threat to food security. There is an urgent need to focus on improving soil fertility and agricultural yield, both of which are severely influenced by abiotic variables such as soil salinity and sodicity. Abiotic forces have rendered one-third of the overall land unproductive. Microbes are the primary answer to the majority of agricultural production’s above- and below-ground problems. In stressful conditions, proper communication between plants and beneficial microbes is critical for avoiding plant cell damage. Many chemical substances such as proteins and metabolites synthesized by bacteria and plants mediate communication and stress reduction. Metabolites such as amino acids, fatty acids, carbohydrates, vitamins, and lipids as well as proteins such as aquaporins and antioxidant enzymes play important roles in plant stress tolerance. Plant beneficial bacteria have an important role in stress reduction through protein and metabolite synthesis under salt stress. Proper genomic, proteomic and metabolomics characterization of proteins and metabolites’ roles in salt stress mitigation aids scientists in discovering a profitable avenue for increasing crop output. This review critically examines recent findings on proteins and metabolites produced during plant-bacteria interaction essential for the development of plant salt stress tolerance.
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Szymańska S, Lis MI, Piernik A, Hrynkiewicz K. Pseudomonas stutzeri and Kushneria marisflavi Alleviate Salinity Stress-Associated Damages in Barley, Lettuce, and Sunflower. Front Microbiol 2022; 13:788893. [PMID: 35350624 PMCID: PMC8957930 DOI: 10.3389/fmicb.2022.788893] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Accepted: 01/11/2022] [Indexed: 11/25/2022] Open
Abstract
Soil salinity is one of the most important abiotic factors limiting plant productivity. The aim of this study was to determine the effect of selected halotolerant plant growth-promoting endophytes (PGPEs, Pseudomonas stutzeri ISE12 and Kushneria marisflavi CSE9) on the growth parameters of barley (Hordeum vulgare), lettuce (Lactuca sativa), and sunflower (Helianthus annuus) cultivated under salt stress conditions. A negative effect of two higher tested salinities (150 and 300 mM NaCl) was observed on the growth parameters of all investigated plants, including germination percentage and index (decreasing compared to the non-saline control variant in the ranges 5.3-91.7 and 13.6-90.9%, respectively), number of leaves (2.2-39.2%), fresh weight (24.2-81.6%); however, differences in salt stress tolerance among the investigated crops were observed (H. annuus > H. vulgare > L. sativa). Our data showed that the most crucial traits affected by endophyte inoculation under salt stress were chlorophyll concentration, leaf development, water storage, root development, and biomass accumulation. Thus, the influence of endophytes was species specific. K. marisflavi CSE9 promoted the growth of all tested plant species and could be considered a universal PGPEs for many plant genotypes cultivated under saline conditions (e.g., increasing of fresh weight compared to the non-inoculated control variant of barley, lettuce, and sunflower in the ranges 11.4-246.8, 118.9-201.2, and 16.4-77.7%, respectively). P. stutzeri ISE12 stimulated growth and mitigated salinity stress only in the case of barley. Bioaugmentation of crops with halotolerant bacterial strains can alleviate salt stress and promote plant growth; however, the selection of compatible strains and the verification of universal plant stress indicators are the key factors.
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Affiliation(s)
- Sonia Szymańska
- Department of Microbiology, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University, Toruń, Poland
| | - Marta Izabela Lis
- Department of Geobotany and Landscape Planning, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University, Toruń, Poland
| | - Agnieszka Piernik
- Department of Geobotany and Landscape Planning, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University, Toruń, Poland
| | - Katarzyna Hrynkiewicz
- Department of Microbiology, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University, Toruń, Poland
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Fadiji AE, Babalola OO, Santoyo G, Perazzolli M. The Potential Role of Microbial Biostimulants in the Amelioration of Climate Change-Associated Abiotic Stresses on Crops. Front Microbiol 2022; 12:829099. [PMID: 35095828 PMCID: PMC8795815 DOI: 10.3389/fmicb.2021.829099] [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: 12/04/2021] [Accepted: 12/29/2021] [Indexed: 02/05/2023] Open
Abstract
Crop plants are more often exposed to abiotic stresses in the current age of fast-evolving climate change. This includes exposure to extreme and unpredictable changes in climatic conditions, phytosanitary hazards, and cultivation conditions, which results in drastic losses in worldwide agricultural productions. Plants coexist with microbial symbionts, some of which play key roles in the ecosystem and plant processes. The application of microbial biostimulants, which take advantage of symbiotic relationships, is a long-term strategy for improving plant productivity and performance, even in the face of climate change-associated stresses. Beneficial filamentous fungi, yeasts, and bacteria are examples of microbial biostimulants, which can boost the growth, yield, nutrition and stress tolerance in plants. This paper highlights recent information about the role of microbial biostimulants and their potential application in mitigating the abiotic stresses occurring on crop plants due to climate change. A critical evaluation for their efficient use under diverse climatic conditions is also made. Currently, accessible products generally improve cultural conditions, but their action mechanisms are mostly unknown, and their benefits are frequently inconsistent. Thus, further studies that could lead to the more precisely targeted products are discussed.
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Affiliation(s)
- Ayomide Emmanuel Fadiji
- Food Security and Safety Niche, Faculty of Natural and Agricultural Sciences, North-West University, Potchefstroom, South Africa
| | - Olubukola Oluranti Babalola
- Food Security and Safety Niche, Faculty of Natural and Agricultural Sciences, North-West University, Potchefstroom, South Africa
| | - Gustavo Santoyo
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Mexico
| | - Michele Perazzolli
- Center Agriculture Food Environment (C3A), University of Trento, San Michele all’Adige, Italy
- Research and Innovation Centre, Fondazione Edmund Mach, San Michele all’Adige, Italy
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El-Sersawy MM, Hassan SED, El-Ghamry AA, El-Gwad AMA, Fouda A. Implication of plant growth-promoting rhizobacteria of Bacillus spp. as biocontrol agents against wilt disease caused by Fusarium oxysporum Schlecht. in Vicia faba L. Biomol Concepts 2021; 12:197-214. [PMID: 35041304 DOI: 10.1515/bmc-2021-0020] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 12/20/2021] [Indexed: 12/26/2022] Open
Abstract
Out of seven Fusarium spp. isolated from infected faba bean roots, two Fusarium oxysporum were selected and showed faba bean-wilt disease severity with percentages of 68% and 47% under greenhouse conditions. The F. oxysporum showed the highest wilt disease was selected to complete the current study. Three rhizobacterial strains were isolated and identified as Bacillus velezensis Vb1, B. paramycoides Vb3, and B. paramycoides Vb6. These strains showed the highest in-vitro antagonistic activity by the dual-culture method against selected F. oxysporum with inhibition percentages of 59±0.2, 46±0.3, and 52±0.3% for Vb1, Vb3, and Vb6, respectively. These rhizobacterial strains exhibit varied activity for nitrogen-fixing and phosphate-solubilizing. Moreover, these strains showed positive results for ammonia, HCN, and siderophores production. The phytohormones production (indole-3-acetic acid, ABA, benzyl, kinten, ziaten, and GA3) and secretion of various lytic enzymes were recorded by these strains with varying degrees. Under greenhouse conditions, the rhizobacterial strains Vb1, Vb3, Vb6, and their consortium can protect faba bean from wilt caused by F. oxysporum with percentages of 70, 60, 65, and 82%, respectively. Under field conditions, the inoculation with the rhizobacterial consortium (Vb1+Vb3+Vb6) significantly increases the growth performance of the F. oxysporum-infected faba bean plant and recorded the highest wilt protection (83.3%).
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Affiliation(s)
| | - Saad El-Din Hassan
- Botany and Microbiology Department, Faculty of Science, Al-Azhar University, Cairo 11884, Egypt
| | - Abbas A El-Ghamry
- Botany and Microbiology Department, Faculty of Science, Al-Azhar University, Cairo 11884, Egypt
| | - Amr Mahmoud Abd El-Gwad
- Soil Fertility and Microbiology Department, Desert Research Center, El-Mataria, Cairo, Egypt
| | - Amr Fouda
- Botany and Microbiology Department, Faculty of Science, Al-Azhar University, Cairo 11884, Egypt
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Verma S, Kumar M, Kumar A, Das S, Chakdar H, Varma A, Saxena AK. Diversity of Bacterial Endophytes of Maize (Zea mays) and Their Functional Potential for Micronutrient Biofortification. Curr Microbiol 2021; 79:6. [PMID: 34905096 DOI: 10.1007/s00284-021-02702-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 11/15/2021] [Indexed: 11/26/2022]
Abstract
Microorganisms due, to their immense metabolic diversity, have the potential to augment the uptake of iron and zinc in addition to other important nutrients in plants. In the present work, 129 different strains of endophytic bacteria were retrieved from stems and leaves of maize. Qualitative screening of these endophytes showed that 24.5% of these isolates were siderophore producers, while 14% could solubilize insoluble zinc compounds and 33% of them had phytase activity. Based on zinc solubilization efficiency and siderophore production ability, 10 isolates each from zinc solubilizers and siderophore producers were selected. Molecular identification indicated that the selected bacteria belonged to diverse genera Microbacterium, Pseudonocardia, Bacillus, Cellulosimicrobium, Staphylococcus, Luteimonas, Bordetella, Brevundimonas, Streptomyces, Cupriavidus, Sphingomonas, Ralstonia, Ochrobactrum, Conyzicola, Paenibacillus and Leifsonia. Quantitative analyses of Zn solubilization using Atomic absorption spectrophotometry (AAS) revealed that Microbacterium hydrothermale M10 and M. proteolyticum B2 were potential solubilizers of different forms of insoluble zinc compounds viz. ZnCO3 (56.63-89.88 ppm), ZnO (106.38-120.08 ppm) and ZnS (3.62-5.56 ppm). Similarly, quantitative estimation of siderophore production activity revealed two endophytes viz. Bacillus altitudinis C7 (97.25% siderophore units) and Pseudonocardia alni M29 (92.05% siderophore units) as potential siderophore producers. These endophytes with potential to produce siderophores and phytases and ability to solubilize zinc can be an important starting material for trials on field to improve Fe and Zn content in edible portion of food crops.
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Affiliation(s)
- Shaloo Verma
- ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Mau, Uttar Pradesh, India
| | - Murugan Kumar
- ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Mau, Uttar Pradesh, India
| | - Adarsh Kumar
- ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Mau, Uttar Pradesh, India
| | - Sudipta Das
- ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Mau, Uttar Pradesh, India
| | - Hillol Chakdar
- ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Mau, Uttar Pradesh, India.
| | - Ajit Varma
- Amity Institute of Microbial Technology, Amity University, Noida, Uttar Pradesh, India
| | - Anil Kumar Saxena
- ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Mau, Uttar Pradesh, India
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Naamala J, Smith DL. Microbial Derived Compounds Are a Promising Approach to Mitigating Salinity Stress in Agricultural Crops. Front Microbiol 2021; 12:765320. [PMID: 34867895 PMCID: PMC8640360 DOI: 10.3389/fmicb.2021.765320] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 10/26/2021] [Indexed: 11/23/2022] Open
Abstract
The use of microbial derived compounds is a technological approach currently gaining popularity among researchers, with hopes of complementing, supplementing and addressing key issues associated with use of microbial cells for enhancing plant growth. The new technology is a promising approach to mitigating effects of salinity stress in agricultural crops, given that these compounds could be less prone to effects of salt stress, are required in small quantities and are easier to store and handle than microbial cells. Microorganism derived compounds such as thuricin17, lipochitooligosaccharides, phytohormones and volatile organic compounds have been reported to mitigate the effects of salt stress in agricultural crops such as soybean and wheat. This mini-review compiles current knowledge regarding the use of microbe derived compounds in mitigating salinity stress in crops, the mechanisms they employ as well as future prospects.
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Affiliation(s)
- Judith Naamala
- Smith Laboratory, Department of Plant Science, McGill University, Montreal, QC, Canada
| | - Donald L Smith
- Smith Laboratory, Department of Plant Science, McGill University, Montreal, QC, Canada
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Roy S, Chakraborty AP, Chakraborty R. Understanding the potential of root microbiome influencing salt-tolerance in plants and mechanisms involved at the transcriptional and translational level. PHYSIOLOGIA PLANTARUM 2021; 173:1657-1681. [PMID: 34549441 DOI: 10.1111/ppl.13570] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 09/10/2021] [Accepted: 09/20/2021] [Indexed: 06/13/2023]
Abstract
Soil salinity severely affects plant growth and development and imparts inevitable losses to crop productivity. Increasing the concentration of salts in the vicinity of plant roots has severe consequences at the morphological, biochemical, and molecular levels. These include loss of chlorophyll, decrease in photosynthetic rate, reduction in cell division, ROS generation, inactivation of antioxidative enzymes, alterations in phytohormone biosynthesis and signaling, and so forth. The association of microorganisms, viz. plant growth-promoting rhizobacteria, endophytes, and mycorrhiza, with plant roots constituting the root microbiome can confer a greater degree of salinity tolerance in addition to their inherent ability to promote growth and induce defense mechanisms. The mechanisms involved in induced stress tolerance bestowed by these microorganisms involve the modulation of phytohormone biosynthesis and signaling pathways (including indole acetic acid, gibberellic acid, brassinosteroids, abscisic acid, and jasmonic acid), accumulation of osmoprotectants (proline, glycine betaine, and sugar alcohols), and regulation of ion transporters (SOS1, NHX, HKT1). Apart from this, salt-tolerant microorganisms are known to induce the expression of salt-responsive genes via the action of several transcription factors, as well as by posttranscriptional and posttranslational modifications. Moreover, the potential of these salt-tolerant microflora can be employed for sustainably improving crop performance in saline environments. Therefore, this review will briefly focus on the key responses of plants under salinity stress and elucidate the mechanisms employed by the salt-tolerant microorganisms in improving plant tolerance under saline environments.
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Affiliation(s)
- Swarnendu Roy
- Plant Biochemistry Laboratory, Department of Botany, University of North Bengal, Darjeeling, West Bengal, India
| | | | - Rakhi Chakraborty
- Department of Botany, Acharya Prafulla Chandra Roy Government College, Darjeeling, West Bengal, India
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Can Bacterial Endophytes Be Used as a Promising Bio-Inoculant for the Mitigation of Salinity Stress in Crop Plants?-A Global Meta-Analysis of the Last Decade (2011-2020). Microorganisms 2021; 9:microorganisms9091861. [PMID: 34576756 PMCID: PMC8467090 DOI: 10.3390/microorganisms9091861] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 08/24/2021] [Accepted: 08/26/2021] [Indexed: 01/20/2023] Open
Abstract
Soil salinity is a major problem affecting crop production worldwide. Lately, there have been great research efforts in increasing the salt tolerance of plants through the inoculation of plant growth-promoting endophytic bacteria. However, their ability to promote plant growth under no-stress and salinity-stress conditions remains largely uncertain. Here, we carried out a global meta-analysis to quantify the plant growth-promoting effects (improvement of morphological attributes, photosynthetic capacity, antioxidative ability, and ion homeostasis) of endophytic bacteria in plants under no-stress and salinity-stress conditions. In addition, we elucidated the underlying mechanisms of growth promotion in salt-sensitive (SS) and salt-tolerant (ST) plants derived from the interaction with endophytic bacteria under no-stress and salinity-stress conditions. Specifically, this work encompassed 42 peer-reviewed articles, a total of 77 experiments, and 24 different bacterial genera. On average, endophytic bacterial inoculation increased morphological parameters. Moreover, the effect of endophytic bacteria on the total dry biomass, number of leaves, root length, shoot length, and germination rate was generally greater under salinity-stress conditions than no-stress conditions. On a physiological level, the relative better performance of the bacterial inoculants under the salinity-stress condition was associated with the increase in total chlorophyll and chlorophyll-b, as well as with the decrease of 1-aminocylopropane-1-carboxylate concentration. Moreover, under the salinity-stress condition, bacterial inoculation conferred a significantly higher increase in root K+ concentration and decrease in leaf Na+ concentration than under the no-stress condition. In SS plants, bacterial inoculation induced a higher increase in chlorophyll-b and superoxide dismutase activity, as well as a higher decrease in abscisic acid content, than in ST plants. Under salinity-stress, endophytic bacterial inoculation increased root K+ concentration in both SS and ST plants but decreased root Na+ concentration only in ST plants. Overall, this meta-analysis suggests that endophytic bacterial inoculation is beneficial under both no salinity-stress and salinity-stress conditions, but the magnitude of benefit is definitely higher under salinity-stress conditions and varies with the salt tolerance level of plants.
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Imran M, Latif Khan A, Shahzad R, Aaqil Khan M, Bilal S, Khan A, Kang SM, Lee IJ. Exogenous melatonin induces drought stress tolerance by promoting plant growth and antioxidant defence system of soybean plants. AOB PLANTS 2021; 13:plab026. [PMID: 34234933 PMCID: PMC8255075 DOI: 10.1093/aobpla/plab026] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 06/08/2021] [Indexed: 05/06/2023]
Abstract
Melatonin is an indolamine bioactive molecule that regulates a wide range of physiological processes during plant growth and enhances abiotic stress tolerance. Here we examined the putative role of exogenous melatonin application (foliar or root zone) in improving drought stress tolerance in soybean seedlings. Pre-treatment of soybean seedlings with melatonin (50 and 100 µM) was found to significantly mitigate the negative effects of drought stress on plant growth-related parameters and chlorophyll content. The beneficial impacts against drought were more pronounced by melatonin application in the rhizosphere than in foliar treatments. The melatonin-induced enhanced tolerance could be attributed to improved photosynthetic activity, reduction of abscisic acid and drought-induced oxidative damage by lowering the accumulation of reactive oxygen species and malondialdehyde. Interestingly, the contents of jasmonic acid and salicylic acid were significantly higher following melatonin treatment in the root zone than in foliar treatment compared with the control. The activity of major antioxidant enzymes such as superoxide dismutase, catalase, polyphenol oxidase, peroxidase and ascorbate peroxidase was stimulated by melatonin application. In addition, melatonin counteracted the drought-induced increase in proline and sugar content. These findings revealed that modifying the endogenous plant hormone content and antioxidant enzymes by melatonin application improved drought tolerance in soybean seedlings. Our findings provide evidence for the stronger physiological role of melatonin in the root zone than in leaves, which may be useful in the large-scale field level application during drought.
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Affiliation(s)
- Muhammad Imran
- School of Applied Biosciences, Kyungpook National University, 41566Republic of Korea
| | - Abdul Latif Khan
- Natural & Medical Sciences Research Center, University of Nizwa, Nizwa 616, Oman
| | - Raheem Shahzad
- Department of Horticulture, the University of Haripur, Haripur 21120, Pakistan
| | - Muhammad Aaqil Khan
- School of Applied Biosciences, Kyungpook National University, 41566Republic of Korea
| | - Saqib Bilal
- Natural & Medical Sciences Research Center, University of Nizwa, Nizwa 616, Oman
| | - Adil Khan
- Department of Plant and Soil sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Sang-Mo Kang
- School of Applied Biosciences, Kyungpook National University, 41566Republic of Korea
| | - In-Jung Lee
- School of Applied Biosciences, Kyungpook National University, 41566Republic of Korea
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Palupi KD, Ilyas M, Agusta A. Endophytic fungi inhabiting Physalis angulata L. plant: diversity, antioxidant, and antibacterial activities of their ethyl acetate extracts. J Basic Clin Physiol Pharmacol 2021; 32:823-829. [PMID: 34214306 DOI: 10.1515/jbcpp-2020-0479] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Accepted: 03/08/2021] [Indexed: 01/16/2023]
Abstract
OBJECTIVES Endophytic fungi are an essential source of biologically active compounds. They have the ability to synthesize secondary metabolites which are the same or have a high degree of similarity to their host plants. In this study, we aimed to explore the biodiversity and the bioactivities of active metabolites produced by 14 endophytic fungi isolated from the medicinal plant Physalis angulata L. (PA). METHODS Fourteen endophytic fungi were isolated from the flowers, stems, leaves, and fruit husks of PA. The endophytic fungi were cultured and incubated in the PDB medium at room temperature. After three weeks, the cultures were extracted using ethyl acetate and dried using a rotary evaporator. The antioxidant activity was evaluated against DPPH while antibacterial activity was evaluated against Escherichia coli and Staphylococcus aureus using microdilution technique. TLC analysis was also done to profile the active compounds within the extract. RESULTS Hyphomycetes fungus isolated from the flower of PA exhibited a moderate antioxidant activity with an antioxidant index value of 0.59 (IC50 = 52.43 μg/mL). Six isolates have strong antibacterial activity against E. coli and S. aureus with minimum inhibitory concentration (MIC) value ranging from 8-64 μg/mL. These endophytic fungi are one Hyphomycetes fungus isolated from the flower, one Fusarium sp. isolated from the stem, and four Colletotrichum sp. isolated from leaf and fruit husk of PA. CONCLUSIONS Endophytic fungi isolated from PA are potential novel sources of active metabolites especially for antibacterial compounds.
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Affiliation(s)
- Kartika Dyah Palupi
- Research Center for Chemistry, Indonesian Institute of Sciences, Kawasan PUSPIPTEK, Tangerang Selatan, Banten, Indonesia
| | - Muhammad Ilyas
- Research Center for Biology, Indonesian Institute of Sciences, Cibinong, Jawa Barat, Indonesia
| | - Andria Agusta
- Research Center for Chemistry, Indonesian Institute of Sciences, Kawasan PUSPIPTEK, Tangerang Selatan, Banten, Indonesia
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Khan MA, Hamayun M, Asaf S, Khan M, Yun BW, Kang SM, Lee IJ. Rhizospheric Bacillus spp. Rescues Plant Growth Under Salinity Stress via Regulating Gene Expression, Endogenous Hormones, and Antioxidant System of Oryza sativa L. FRONTIERS IN PLANT SCIENCE 2021; 12:665590. [PMID: 34177981 PMCID: PMC8226221 DOI: 10.3389/fpls.2021.665590] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 05/19/2021] [Indexed: 05/27/2023]
Abstract
Salinity has drastically reduced crop yields and harmed the global agricultural industry. We isolated 55 bacterial strains from plants inhabiting the coastal sand dunes of Pohang, Korea. A screening bioassay showed that 14 of the bacterial isolates secreted indole-3-acetic acid (IAA), 12 isolates were capable of exopolysaccharide (EPS) production and phosphate solubilization, and 10 isolates secreted siderophores. Based on our preliminary screening, 11 bacterial isolates were tested for salinity tolerance on Luria-Bertani (LB) media supplemented with 0, 50, 100, and 150 mM of NaCl. Three bacterial isolates, ALT11, ALT12, and ALT30, had the best tolerance against elevated NaCl levels and were selected for further study. Inoculation of the selected bacterial isolates significantly enhanced rice growth attributes, viz., shoot length (22.8-42.2%), root length (28.18-59%), fresh biomass (44.7-66.41%), dry biomass (85-90%), chlorophyll content (18.30-36.15%), Chl a (29.02-60.87%), Chl b (30.86-64.51%), and carotenoid content (26.86-70%), under elevated salt stress of 70 and 140 mM. Furthermore, a decrease in the endogenous abscisic acid (ABA) content (27.9-23%) and endogenous salicylic acid (SA) levels (11.70-69.19%) was observed in inoculated plants. Antioxidant analysis revealed an increase in total protein (TP) levels (42.57-68.26%), whereas it revealed a decrease in polyphenol peroxidase (PPO) (24.63-34.57%), glutathione (GSH) (25.53-24.91%), SOA (13.88-18.67%), and LPO levels (15.96-26.06%) of bacterial-inoculated plants. Moreover, an increase in catalase (CAT) (26-33.04%), peroxidase (POD) (59.55-78%), superoxide dismutase (SOD) (13.58-27.77%), and ascorbic peroxidase (APX) (5.76-22.74%) activity was observed. Additionally, inductively coupled plasma mass spectrometry (ICP-MS) analysis showed a decline in Na+ content (24.11 and 30.60%) and an increase in K+ (23.14 and 15.45%) and Mg+ (2.82 and 18.74%) under elevated salt stress. OsNHX1 gene expression was downregulated (0.3 and 4.1-folds), whereas the gene expression of OsPIN1A, OsCATA, and OsAPX1 was upregulated by a 7-17-fold in bacterial-inoculated rice plants. It was concluded that the selected bacterial isolates, ALT11, ALT12, and ALT30, mitigated the adverse effects of salt stress on rice growth and can be used as climate smart agricultural tools in ecofriendly agricultural practices.
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Affiliation(s)
- Muhammad Aaqil Khan
- Department of Applied Biosciences, Kyungpook National University, Daegu, South Korea
| | - Muhammad Hamayun
- Department of Botany, Abdul Wali Khan University, Mardan, Pakistan
| | - Sajjad Asaf
- Natural and Medical Science Research Center, University of Nizwa, Nizwa, Oman
| | - Murtaza Khan
- Department of Applied Biosciences, Kyungpook National University, Daegu, South Korea
| | - Byung-Wook Yun
- Department of Botany, Abdul Wali Khan University, Mardan, Pakistan
| | - Sang-Mo Kang
- Department of Applied Biosciences, Kyungpook National University, Daegu, South Korea
| | - In-Jung Lee
- Department of Applied Biosciences, Kyungpook National University, Daegu, South Korea
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Khan MA, Sahile AA, Jan R, Asaf S, Hamayun M, Imran M, Adhikari A, Kang SM, Kim KM, Lee IJ. Halotolerant bacteria mitigate the effects of salinity stress on soybean growth by regulating secondary metabolites and molecular responses. BMC PLANT BIOLOGY 2021; 21:176. [PMID: 33845762 PMCID: PMC8040224 DOI: 10.1186/s12870-021-02937-3] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 03/25/2021] [Indexed: 05/15/2023]
Abstract
BACKGROUND Salinity is a major threat to the agriculture industry due to the negative impact of salinity stress on crop productivity. In the present study, we isolated rhizobacteria and evaluated their capacities to promote crop growth under salt stress conditions. RESULTS We isolated rhizospheric bacteria from sand dune flora of Pohang beach, Korea, and screened them for plant growth-promoting (PGP) traits. Among 55 bacterial isolates, 14 produced indole-3-acetic acid (IAA), 10 produced siderophores, and 12 produced extracellular polymeric and phosphate solubilization. Based on these PGP traits, we selected 11 isolates to assess for salinity tolerance. Among them, ALT29 and ALT43 showed the highest tolerance to salinity stress. Next, we tested the culture filtrate of isolates ALT29 and ALT43 for IAA and organic acids to confirm the presence of these PGP products. To investigate the effects of ALT29 and ALT43 on salt tolerance in soybean, we grew seedlings in 0 mM, 80 mM, 160 mM, and 240 mM NaCl treatments, inoculating half with the bacterial isolates. Inoculation with ALT29 and ALT43 significantly increased shoot length (13%), root length (21%), shoot fresh and dry weight (44 and 35%), root fresh and dry weight (9%), chlorophyll content (16-24%), Chl a (8-43%), Chl b (13-46%), and carotenoid (14-39%) content of soybean grown under salt stress. Inoculation with ALT29 and ALT43 also significantly decreased endogenous ABA levels (0.77-fold) and increased endogenous SA contents (6-16%), increased total protein (10-20%) and glutathione contents, and reduced lipid peroxidation (0.8-5-fold), superoxide anion (21-68%), peroxidase (12.14-17.97%), and polyphenol oxidase (11.76-27.06%) contents in soybean under salinity stress. In addition, soybean treated with ALT29 and ALT43 exhibited higher K+ uptake (9.34-67.03%) and reduced Na+ content (2-4.5-fold). Genes involved in salt tolerance, GmFLD19 and GmNARK, were upregulated under NaCl stress; however, significant decreases in GmFLD19 (3-12-fold) and GmNARK (1.8-3.7-fold) expression were observed in bacterial inoculated plants. CONCLUSION In conclusion, bacterial isolates ALT29 and ALT43 can mitigate salinity stress and increase plant growth, providing an eco-friendly approach for addressing saline conditions in agricultural production systems.
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Affiliation(s)
- Muhammad Aaqil Khan
- School of Applied Biosciences, Kyungpook National University, Daegu, 41566, Republic of Korea.
| | - Atlaw Anbelu Sahile
- School of Applied Biosciences, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Rahmatullah Jan
- School of Applied Biosciences, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Sajjad Asaf
- Natural and Medical Plants Research center, University of Nizwa, 616, Nizwa, Oman
| | - Muhammad Hamayun
- Department of Botany, Abdul Wali Khan University, Mardan, Pakistan
| | - Muhammad Imran
- School of Applied Biosciences, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Arjun Adhikari
- School of Applied Biosciences, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Sang-Mo Kang
- School of Applied Biosciences, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Kyung-Min Kim
- School of Applied Biosciences, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - In-Jung Lee
- School of Applied Biosciences, Kyungpook National University, Daegu, 41566, Republic of Korea.
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Sahab S, Suhani I, Srivastava V, Chauhan PS, Singh RP, Prasad V. Potential risk assessment of soil salinity to agroecosystem sustainability: Current status and management strategies. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 764:144164. [PMID: 33385648 DOI: 10.1016/j.scitotenv.2020.144164] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 11/16/2020] [Accepted: 11/28/2020] [Indexed: 05/09/2023]
Abstract
Soil salinization has become a major global agricultural issue that threatens sustainable development goals related to food security, agriculture, resource conservation, and nutrition. The higher levels of salinity have detrimental effects on soil physico-chemical and biological characteristics and plant metabolism. Also, salinity poses a negative impact on the abundance and distribution of soil microbes and soil-dwelling organisms. Research has always been trying to overcome the salinity issue, but it does not fit well in conventional approaches. This review unravels traditional and modern salinity management techniques. Out of the available salinity management techniques, some are focused on enhancing soil properties (chemical amendments, biochar, earthworms, and their vermicompost, compost, microbial inoculants, electro remediation), some focus on improving plant properties (seed priming, afforestation, crop selection, genetic improvements, agroforestry) and some techniques augment both soil as well as plant properties in a synergic manner. Therefore, it is imperative to find a conclusive solution by integrating traditional and modern methods to find the most effective response to regionally-specific salinity related problems. This review aimed at critical analysis of the salinity problems, its impact on agroecosystem, and different management approaches available to date with a balanced viewpoint that would help to draw a possible roadmap towards the future investigation in this domain for sustainable management of salinity issues around the globe.
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Affiliation(s)
- Sinha Sahab
- Institute of Environment & Sustainable Development, Banaras Hindu University, Varanasi 221005, India
| | - Ibha Suhani
- Institute of Environment & Sustainable Development, Banaras Hindu University, Varanasi 221005, India
| | - Vaibhav Srivastava
- Institute of Environment & Sustainable Development, Banaras Hindu University, Varanasi 221005, India
| | - Puneet Singh Chauhan
- Division of Plant-Microbe Interaction, CSIR-National Botanical Research Institute (NBRI), Lucknow, India
| | - Rajeev Pratap Singh
- Institute of Environment & Sustainable Development, Banaras Hindu University, Varanasi 221005, India.
| | - Vishal Prasad
- Institute of Environment & Sustainable Development, Banaras Hindu University, Varanasi 221005, India
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Ha-Tran DM, Nguyen TTM, Hung SH, Huang E, Huang CC. Roles of Plant Growth-Promoting Rhizobacteria (PGPR) in Stimulating Salinity Stress Defense in Plants: A Review. Int J Mol Sci 2021; 22:3154. [PMID: 33808829 PMCID: PMC8003591 DOI: 10.3390/ijms22063154] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 03/17/2021] [Accepted: 03/18/2021] [Indexed: 12/14/2022] Open
Abstract
To date, soil salinity becomes a huge obstacle for food production worldwide since salt stress is one of the major factors limiting agricultural productivity. It is estimated that a significant loss of crops (20-50%) would be due to drought and salinity. To embark upon this harsh situation, numerous strategies such as plant breeding, plant genetic engineering, and a large variety of agricultural practices including the applications of plant growth-promoting rhizobacteria (PGPR) and seed biopriming technique have been developed to improve plant defense system against salt stress, resulting in higher crop yields to meet human's increasing food demand in the future. In the present review, we update and discuss the advantageous roles of beneficial PGPR as green bioinoculants in mitigating the burden of high saline conditions on morphological parameters and on physio-biochemical attributes of plant crops via diverse mechanisms. In addition, the applications of PGPR as a useful tool in seed biopriming technique are also updated and discussed since this approach exhibits promising potentials in improving seed vigor, rapid seed germination, and seedling growth uniformity. Furthermore, the controversial findings regarding the fluctuation of antioxidants and osmolytes in PGPR-treated plants are also pointed out and discussed.
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Affiliation(s)
- Dung Minh Ha-Tran
- Molecular and Biological Agricultural Sciences Program, Taiwan International Graduate Program, Academia Sinica and National Chung Hsing University, Taipei 11529, Taiwan;
- Department of Life Sciences, National Chung Hsing University, Taichung 40227, Taiwan; (T.T.M.N.); (S.-H.H.)
- Graduate Institute of Biotechnology, National Chung Hsing University, Taichung 40227, Taiwan
| | - Trinh Thi My Nguyen
- Department of Life Sciences, National Chung Hsing University, Taichung 40227, Taiwan; (T.T.M.N.); (S.-H.H.)
| | - Shih-Hsun Hung
- Department of Life Sciences, National Chung Hsing University, Taichung 40227, Taiwan; (T.T.M.N.); (S.-H.H.)
- Department of Horticulture, National Chung Hsing University, Taichung 40227, Taiwan
| | - Eugene Huang
- College of Agriculture and Natural Resources, National Chung Hsing University, Taichung 40227, Taiwan;
| | - Chieh-Chen Huang
- Department of Life Sciences, National Chung Hsing University, Taichung 40227, Taiwan; (T.T.M.N.); (S.-H.H.)
- Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung 40227, Taiwan
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Vega-Celedón P, Bravo G, Velásquez A, Cid FP, Valenzuela M, Ramírez I, Vasconez IN, Álvarez I, Jorquera MA, Seeger M. Microbial Diversity of Psychrotolerant Bacteria Isolated from Wild Flora of Andes Mountains and Patagonia of Chile towards the Selection of Plant Growth-Promoting Bacterial Consortia to Alleviate Cold Stress in Plants. Microorganisms 2021; 9:microorganisms9030538. [PMID: 33807836 PMCID: PMC7998784 DOI: 10.3390/microorganisms9030538] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 03/02/2021] [Accepted: 03/02/2021] [Indexed: 02/02/2023] Open
Abstract
Cold stress decreases the growth and productivity of agricultural crops. Psychrotolerant plant growth-promoting bacteria (PGPB) may protect and promote plant growth at low temperatures. The aims of this study were to isolate and characterize psychrotolerant PGPB from wild flora of Andes Mountains and Patagonia of Chile and to formulate PGPB consortia. Psychrotolerant strains were isolated from 11 wild plants (rhizosphere and phyllosphere) during winter of 2015. For the first time, bacteria associated with Calycera, Orites, and Chusquea plant genera were reported. More than 50% of the 130 isolates showed ≥33% bacterial cell survival at temperatures below zero. Seventy strains of Pseudomonas, Curtobacterium, Janthinobacterium, Stenotrophomonas, Serratia, Brevundimonas, Xanthomonas, Frondihabitans, Arthrobacter, Pseudarthrobacter, Paenarthrobacter, Brachybacterium, Clavibacter, Sporosarcina, Bacillus, Solibacillus, Flavobacterium, and Pedobacter genera were identified by 16S rRNA gene sequence analyses. Ten strains were selected based on psychrotolerance, auxin production, phosphate solubilization, presence of nifH (nitrogenase reductase) and acdS (1-aminocyclopropane-1-carboxylate (ACC) deaminase) genes, and anti-phytopathogenic activities. Two of the three bacterial consortia formulated promoted tomato plant growth under normal and cold stress conditions. The bacterial consortium composed of Pseudomonas sp. TmR5a & Curtobacterium sp. BmP22c that possesses ACC deaminase and ice recrystallization inhibition activities is a promising candidate for future cold stress studies.
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Affiliation(s)
- Paulina Vega-Celedón
- Molecular Microbiology and Environmental Biotechnology Laboratory, Department of Chemistry, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile; (G.B.); (A.V.); (M.V.); (I.-N.V.); (I.Á.)
- Center of Biotechnology “Dr. Daniel Alkalay Lowitt”, Universidad Técnica Federico Santa María, General Bari 699, Valparaíso 2390136, Chile;
- Correspondence: (P.V.-C.); (M.S.); Tel.: +56-322654685 (P.V.-C.)
| | - Guillermo Bravo
- Molecular Microbiology and Environmental Biotechnology Laboratory, Department of Chemistry, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile; (G.B.); (A.V.); (M.V.); (I.-N.V.); (I.Á.)
- Center of Biotechnology “Dr. Daniel Alkalay Lowitt”, Universidad Técnica Federico Santa María, General Bari 699, Valparaíso 2390136, Chile;
| | - Alexis Velásquez
- Molecular Microbiology and Environmental Biotechnology Laboratory, Department of Chemistry, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile; (G.B.); (A.V.); (M.V.); (I.-N.V.); (I.Á.)
- Center of Biotechnology “Dr. Daniel Alkalay Lowitt”, Universidad Técnica Federico Santa María, General Bari 699, Valparaíso 2390136, Chile;
| | - Fernanda P. Cid
- Laboratorio de Ecología Microbiana Aplicada (EMALAB), Departamento de Ciencias Químicas y Recursos Naturales, Universidad de La Frontera, Avenida Francisco Salazar 1145, Temuco 4811230, Chile; (F.P.C.); (M.A.J.)
- Center of Plant-Soil Interaction and Natural Resources Biotechnology, Scientific and Technological Bioresource Nucleus (BIOREN), Universidad de La Frontera, Avenida Francisco Salazar 1145, Temuco 4811230, Chile
| | - Miryam Valenzuela
- Molecular Microbiology and Environmental Biotechnology Laboratory, Department of Chemistry, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile; (G.B.); (A.V.); (M.V.); (I.-N.V.); (I.Á.)
- Center of Biotechnology “Dr. Daniel Alkalay Lowitt”, Universidad Técnica Federico Santa María, General Bari 699, Valparaíso 2390136, Chile;
| | - Ingrid Ramírez
- Center of Biotechnology “Dr. Daniel Alkalay Lowitt”, Universidad Técnica Federico Santa María, General Bari 699, Valparaíso 2390136, Chile;
| | - Ingrid-Nicole Vasconez
- Molecular Microbiology and Environmental Biotechnology Laboratory, Department of Chemistry, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile; (G.B.); (A.V.); (M.V.); (I.-N.V.); (I.Á.)
- Center of Biotechnology “Dr. Daniel Alkalay Lowitt”, Universidad Técnica Federico Santa María, General Bari 699, Valparaíso 2390136, Chile;
| | - Inaudis Álvarez
- Molecular Microbiology and Environmental Biotechnology Laboratory, Department of Chemistry, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile; (G.B.); (A.V.); (M.V.); (I.-N.V.); (I.Á.)
- Center of Biotechnology “Dr. Daniel Alkalay Lowitt”, Universidad Técnica Federico Santa María, General Bari 699, Valparaíso 2390136, Chile;
| | - Milko A. Jorquera
- Laboratorio de Ecología Microbiana Aplicada (EMALAB), Departamento de Ciencias Químicas y Recursos Naturales, Universidad de La Frontera, Avenida Francisco Salazar 1145, Temuco 4811230, Chile; (F.P.C.); (M.A.J.)
- Center of Plant-Soil Interaction and Natural Resources Biotechnology, Scientific and Technological Bioresource Nucleus (BIOREN), Universidad de La Frontera, Avenida Francisco Salazar 1145, Temuco 4811230, Chile
| | - Michael Seeger
- Molecular Microbiology and Environmental Biotechnology Laboratory, Department of Chemistry, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso 2390123, Chile; (G.B.); (A.V.); (M.V.); (I.-N.V.); (I.Á.)
- Center of Biotechnology “Dr. Daniel Alkalay Lowitt”, Universidad Técnica Federico Santa María, General Bari 699, Valparaíso 2390136, Chile;
- Correspondence: (P.V.-C.); (M.S.); Tel.: +56-322654685 (P.V.-C.)
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Mitigation of NaCl Stress in Wheat by Rhizosphere Engineering Using Salt Habitat Adapted PGPR Halotolerant Bacteria. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11031034] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
There is a great interest in mitigating soil salinity that limits plant growth and productivity. In this study, eighty-nine strains were isolated from the rhizosphere and endosphere of two halophyte species (Suaeda mollis and Salsola tetrandra) collected from three chotts in Algeria. They were screened for diverse plant growth-promoting traits, antifungal activity and tolerance to different physico-chemical conditions (pH, PEG, and NaCl) to evaluate their efficiency in mitigating salt stress and enhancing the growth of Arabidopsis thaliana and durum wheat under NaCl–stress conditions. Three bacterial strains BR5, OR15, and RB13 were finally selected and identified as Bacillus atropheus. The Bacterial strains (separately and combined) were then used for inoculating Arabidopsis thaliana and durum wheat during the seed germination stage under NaCl stress conditions. Results indicated that inoculation of both plant spp. with the bacterial strains separately or combined considerably improved the growth parameters. Three soils with different salinity levels (S1 = 0.48, S2 = 3.81, and S3 = 2.80 mS/cm) were used to investigate the effects of selected strains (BR5, OR15, and RB13; separately and combined) on several growth parameters of wheat plants. The inoculation (notably the multi-strain consortium) proved a better approach to increase the chlorophyll and carotenoid contents as compared to control plants. However, proline content, lipid peroxidation, and activities of antioxidant enzymes decreased after inoculation with the plant growth-promoting rhizobacteria (PGPR) that can attenuate the adverse effects of salt stress by reducing the reactive oxygen species (ROS) production. These results indicated that under saline soil conditions, halotolerant PGPR strains are promising candidates as biofertilizers under salt stress conditions.
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Kim YN, Khan MA, Kang SM, Hamayun M, Lee IJ. Enhancement of Drought-Stress Tolerance of Brassica oleracea var. italica L. by Newly Isolated Variovorax sp. YNA59. J Microbiol Biotechnol 2020; 30:1500-1509. [PMID: 32807757 PMCID: PMC9728237 DOI: 10.4014/jmb.2006.06010] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 08/06/2020] [Accepted: 08/10/2020] [Indexed: 12/15/2022]
Abstract
Drought is a major abiotic factor and has drastically reduced crop yield globally, thus damaging the agricultural industry. Drought stress decreases crop productivity by negatively affecting crop morphological, physiological, and biochemical factors. The use of drought tolerant bacteria improves agricultural productivity by counteracting the negative effects of drought stress on crops. In this study, we isolated bacteria from the rhizosphere of broccoli field located in Daehaw-myeon, Republic of Korea. Sixty bacterial isolates were screened for their growth-promoting capacity, in vitro abscisic acid (ABA), and sugar production activities. Among these, bacterial isolates YNA59 was selected based on their plant growth-promoting bacteria traits, ABA, and sugar production activities. Isolate YNA59 highly tolerated oxidative stress, including hydrogen peroxide (H2O2) and produces superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX) activities in the culture broth. YNA59 treatment on broccoli significantly enhanced plant growth attributes, chlorophyll content, and moisture content under drought stress conditions. Under drought stress, the endogenous levels of ABA, jasmonic acid (JA), and salicylic acid (SA) increased; however, inoculation of YNA59 markedly reduced ABA (877 ± 22 ng/g) and JA (169.36 ± 20.74 ng/g) content, while it enhanced SA levels (176.55 ± 9.58 ng/g). Antioxidant analysis showed that the bacterial isolate YNA59 inoculated into broccoli plants contained significantly higher levels of SOD, CAT, and APX, with a decrease in GPX levels. The bacterial isolate YNA59 was therefore identified as Variovorax sp. YNA59. Our current findings suggest that newly isolated drought tolerant rhizospheric Variovorax sp. YNA59 is a useful stress-evading rhizobacterium that improved droughtstress tolerance of broccoli and could be used as a bio-fertilizer under drought conditions.
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Affiliation(s)
- Yu-Na Kim
- School of Applied Biosciences, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Muhammad Aaqil Khan
- School of Applied Biosciences, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Sang-Mo Kang
- School of Applied Biosciences, Kyungpook National University, Daegu 41566, Republic of Korea,Institute of Agricultural Science and Technology, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Muhammad Hamayun
- Department of Botany, Abdul Wali Khan University, Mardan, Pakistan
| | - In-Jung Lee
- School of Applied Biosciences, Kyungpook National University, Daegu 41566, Republic of Korea,Corresponding author Phone: +82-53-950-5708 Fax: +82-53-953-6880 E-mail:
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Hayat K, Zhou Y, Menhas S, Bundschuh J, Hayat S, Ullah A, Wang J, Chen X, Zhang D, Zhou P. Pennisetum giganteum: An emerging salt accumulating/tolerant non-conventional crop for sustainable saline agriculture and simultaneous phytoremediation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 265:114876. [PMID: 32512425 DOI: 10.1016/j.envpol.2020.114876] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 05/07/2020] [Accepted: 05/24/2020] [Indexed: 06/11/2023]
Abstract
Soil salinity is a global threat to the environmental sustainability, in particular to the developing countries due to their limited resources for soil reclamation. In a greenhouse pot experiment, Pennisetum giganteum, was investigated for its tolerance to salt stress and simultaneous phytoremediation capability. 4 weeks post-germination, NaCl (10, 50, 150, 250, 350, 450 and 550 mM) and tap water (control) was applied after every 2 consecutive days for two weeks in a completely randomized design and their effects were established in the growth and physico-chemical aspects of these plants. Our results indicated that P. giganteum withstood high salt stress (with 550 mM NaCl tolerance threshold level). Interestingly, the plants grown under saline conditions had higher biomass yield when compared to the control. Furthermore, the antioxidant activity and proline content of plants under saline conditions were significantly (p < 0.05) higher than those of control plants, indicating their adaptability to high salt stress. Biochemical analysis such as chlorophyll contents, total soluble sugar, total phenol and protein contents revealed considerable differences between plants grown under higher NaCl stress compared to the control conditions. Additionally, significantly different ionic flux along with high K+/Na+ ratio was observed in plants grown under a range of saline conditions. The results obtained are therefore of value to indicate P. giganteum an eco-friendly alternate source for the phytoremediation of saline soils and may be used as base for future research on this plant. Effective strategies need to be adopted with this plant to reclaim saline-degraded as well as marginal soils.
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Affiliation(s)
- Kashif Hayat
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, PR China; Key Laboratory of Urban Agriculture, Ministry of Agriculture and Rural Affairs, Shanghai, China
| | - Yuanfei Zhou
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, PR China; Key Laboratory of Urban Agriculture, Ministry of Agriculture and Rural Affairs, Shanghai, China
| | - Saiqa Menhas
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, PR China; Key Laboratory of Urban Agriculture, Ministry of Agriculture and Rural Affairs, Shanghai, China
| | - Jochen Bundschuh
- UNESCO Chair on Groundwater Arsenic within the 2030 Agenda for Sustainable Development & Faculty of Health, Engineering and Sciences, University of Southern Queensland, Toowoomba, Queensland, 4350, Australia
| | - Sikandar Hayat
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, PR China
| | - Abid Ullah
- Department of Botany, University of Malakand, Chakdara Dir Lower, 18800, Khyber Pakhtunkhwa, IR, Pakistan
| | - Juncai Wang
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, PR China; Key Laboratory of Urban Agriculture, Ministry of Agriculture and Rural Affairs, Shanghai, China
| | - Xunfeng Chen
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, PR China; Key Laboratory of Urban Agriculture, Ministry of Agriculture and Rural Affairs, Shanghai, China
| | - Dan Zhang
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, PR China; Key Laboratory of Urban Agriculture, Ministry of Agriculture and Rural Affairs, Shanghai, China
| | - Pei Zhou
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, PR China; Key Laboratory of Urban Agriculture, Ministry of Agriculture and Rural Affairs, Shanghai, China.
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Khan MA, Asaf S, Khan AL, Adhikari A, Jan R, Ali S, Imran M, Kim KM, Lee IJ. Plant growth-promoting endophytic bacteria augment growth and salinity tolerance in rice plants. PLANT BIOLOGY (STUTTGART, GERMANY) 2020; 22:850-862. [PMID: 32329163 DOI: 10.1111/plb.13124] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 03/28/2020] [Accepted: 04/13/2020] [Indexed: 05/07/2023]
Abstract
Salt stress negatively affects growth and development of plants. However, it is hypothesized that plant growth-promoting endophytic bacteria can greatly alleviate the adverse effects of salinity and can promote growth and development of plants. In the present research, we aimed to isolate endophytic bacteria from halotolerant plants and evaluate their capacity for promoting crop plant growth. The bacterial endophytes were isolated from selected plants inhabiting sand dunes at Pohang beach, screened for plant growth-promoting traits and applied to rice seedlings under salt stress (NaCl; 150 mm). Out of 59 endophytic bacterial isolates, only six isolates, i.e. Curtobacterium oceanosedimentum SAK1, Curtobacterium luteum SAK2, Enterobacter ludwigii SAK5, Bacillus cereus SA1, Micrococcus yunnanensis SA2, Enterobacter tabaci SA3, resulted in a significant increase in the growth of Waito-C rice. The cultural filtrates of bacterial endophytes were tested for phytohormones, including indole-3-acetic acid, gibberellins and organic acids. Inoculation of the selected strains considerably reduced the amount of endogenous ABA in rice plants under NaCl stress, however, they increased GSH and sugar content. Similarly, these strains augmented the expression of flavin monooxygenase (OsYUCCA1) and auxin efflux carrier (OsPIN1) genes under salt stress. In conclusion, the pragmatic application of the above selected bacterial strains alleviated the adverse effects of NaCl stress and enhanced rice growth attributes by producing various phytohormones.
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Affiliation(s)
- M A Khan
- School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - S Asaf
- Natural and Medical Sciences Research Center, University of Nizwa, Nizwa, Oman
| | - A L Khan
- Natural and Medical Sciences Research Center, University of Nizwa, Nizwa, Oman
| | - A Adhikari
- School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - R Jan
- School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - S Ali
- School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - M Imran
- School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - K-M Kim
- School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - I-J Lee
- School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
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49
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Kumar Arora N, Fatima T, Mishra J, Mishra I, Verma S, Verma R, Verma M, Bhattacharya A, Verma P, Mishra P, Bharti C. Halo-tolerant plant growth promoting rhizobacteria for improving productivity and remediation of saline soils. J Adv Res 2020; 26:69-82. [PMID: 33133684 PMCID: PMC7584680 DOI: 10.1016/j.jare.2020.07.003] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 06/26/2020] [Accepted: 07/07/2020] [Indexed: 12/13/2022] Open
Abstract
Background The collective impact of climate change and soil salinity is continuously increasing the degraded lands across the globe, bringing agricultural productivity and food security under stress. The high concentration of salts in saline soils impose osmotic, ionic, oxidative and water stress in plants. Biological solutions can be the most reliable and sustainable approach to ensure food security and limit the use of agro-chemicals. Aim of Review Halo-tolerant plant growth promoting rhizobacteria (HT-PGPR) are emerging as efficient biological tools to mitigate the toxic effects of high salt concentrations and improve the growth of plants, simultaneously remediating the degraded saline soils. The review explains the role of HT-PGPR in mitigating the salinity stress in plants through diverse mechanisms and concurrently leading to improvement of soil quality. Key Scientific Concepts of Review HT-PGPR are involved in alleviating the salinity stress in plants through a number of mechanisms evoking multipronged physiological, biochemical and molecular responses. These include changes in expression of defense-related proteins, exopolysaccharides synthesis, activation of antioxidant machinery, accumulation of osmolytes, maintaining the Na+ kinetics and improving the levels of phytohormones and nutrient uptake in plants. The modification of signaling by HT-PGPR inoculation under stress conditions elicits induced systemic resistance in plants which further prepares them against salinity stress. The role of microbial-mechanisms in remediating the saline soil through structural and compositional improvements is also important. Development of novel bioinoculants for saline soils based on the concepts presented in the review can be a sustainable approach in improving productivity of affected agro-ecosystems and simultaneously remediating them.
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Affiliation(s)
- Naveen Kumar Arora
- Department of Environmental Science, School for Environmental Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, UP, India
| | - Tahmish Fatima
- Department of Microbiology, Babasaheb Bhimrao Ambedkar University, Lucknow, UP, India
| | - Jitendra Mishra
- DST-CPR, Babasaheb Bhimrao Ambedkar University, Lucknow, UP, India
| | - Isha Mishra
- Department of Microbiology, Babasaheb Bhimrao Ambedkar University, Lucknow, UP, India
| | - Sushma Verma
- Department of Microbiology, Babasaheb Bhimrao Ambedkar University, Lucknow, UP, India
| | - Renu Verma
- Department of Microbiology, Babasaheb Bhimrao Ambedkar University, Lucknow, UP, India
| | - Maya Verma
- Uttar Pradesh Pollution Control Board (UPPCB), Lucknow, UP, India
| | - Ankita Bhattacharya
- Department of Environmental Science, School for Environmental Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, UP, India
| | - Priyanka Verma
- Department of Environmental Science, School for Environmental Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, UP, India
| | - Priya Mishra
- Department of Environmental Science, School for Environmental Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, UP, India
| | - Chanda Bharti
- Department of Environmental Science, School for Environmental Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, UP, India
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50
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Mina D, Pereira JA, Lino-Neto T, Baptista P. Epiphytic and Endophytic Bacteria on Olive Tree Phyllosphere: Exploring Tissue and Cultivar Effect. MICROBIAL ECOLOGY 2020; 80:145-157. [PMID: 31965223 DOI: 10.1007/s00248-020-01488-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 01/09/2020] [Indexed: 06/10/2023]
Abstract
Variation on bacterial communities living in the phyllosphere as epiphytes and endophytes has been attributed to plant host effects. However, there is contradictory or inconclusive evidence regarding the effect of plant genetics (below the species' level) and of plant tissue type on phyllosphere bacterial community assembly, in particular when epiphytes and endophytes are considered simultaneously. Here, both surface and internal bacterial communities of two olive (Olea europaea) cultivars were evaluated in twigs and leaves by molecular identification of cultivable isolates, with an attempt to answer these questions. Overall, Proteobacteria, Actinobacteria and Firmicutes were the dominant phyla, being epiphytes more diverse and abundant than endophytes. Host genotype (at cultivar level) had a structuring effect on the composition of bacterial communities and, in a similar way, for both epiphytes and endophytes. Plant organ (leaf vs. twig) control of the bacterial communities was less evident when compared with plant genotype and with a greater influence on epiphytic than on endophytic community structure. Each olive genotype/plant organ was apparently selective towards specific bacterial operational taxonomic units (OTUs), which may lead to specific feedbacks on fitness of plant genotypes. Bacterial recruitment was observed to happen mainly within epiphytes than in endophytes and in leaves as compared with twigs. Such host specificity suggested that the benefits derived from the plant-bacteria interaction should be considered at genetic levels below the species.
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Affiliation(s)
- Diogo Mina
- Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253, Braganca, Portugal
| | - José Alberto Pereira
- Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253, Braganca, Portugal
| | - Teresa Lino-Neto
- Biosystems and Integrative Sciences Institute (BioISI), Plant Functional Biology Center (CBFP), University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal
| | - Paula Baptista
- Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253, Braganca, Portugal.
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