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Liang Q, Tan D, Chen H, Guo X, Afzal M, Wang X, Tan Z, Peng G. Endophyte-mediated enhancement of salt resistance in Arachis hypogaea L. by regulation of osmotic stress and plant defense-related genes. Front Microbiol 2024; 15:1383545. [PMID: 38846577 PMCID: PMC11153688 DOI: 10.3389/fmicb.2024.1383545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Accepted: 04/18/2024] [Indexed: 06/09/2024] Open
Abstract
Introduction Soil salinization poses a significant environmental challenge affecting plant growth and agricultural sustainability. This study explores the potential of salt-tolerant endophytes to mitigate the adverse effects of soil salinization, emphasizing their impact on the development and resistance of Arachis hypogaea L. (peanuts). Methods The diversity of culturable plant endophytic bacteria associated with Miscanthus lutarioriparius was investigated. The study focused on the effects of Bacillus tequilensis, Staphylococcus epidermidis, and Bacillus siamensis on the development and germination of A. hypogaea seeds in pots subjected to high NaCl concentrations (200 mM L-1). Results Under elevated NaCl concentrations, the inoculation of endophytes significantly (p < 0.05) enhanced seedling germination and increased the activities of enzymes such as Superoxide dismutase, catalase, and polyphenol oxidase, while reducing malondialdehyde and peroxidase levels. Additionally, endophyte inoculation resulted in increased root surface area, plant height, biomass contents, and leaf surface area of peanuts under NaCl stress. Transcriptome data revealed an augmented defense and resistance response induced by the applied endophyte (B. tequilensis, S. epidermidis, and B. siamensis) strain, including upregulation of abiotic stress related mechanisms such as fat metabolism, hormones, and glycosyl inositol phosphorylceramide (Na+ receptor). Na+ receptor under salt stress gate Ca2+ influx channels in plants. Notably, the synthesis of secondary metabolites, especially genes related to terpene and phenylpropanoid pathways, was highly regulated. Conclusion The inoculated endophytes played a possible role in enhancing salt tolerance in peanuts. Future investigations should explore protein-protein interactions between plants and endophytes to unravel the mechanisms underlying endophyte-mediated salt resistance in plants.
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Affiliation(s)
- Qihua Liang
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China
| | - Dedong Tan
- University of South China, Hengyang, China
| | - Haohai Chen
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China
| | - Xiaoli Guo
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China
| | - Muhammad Afzal
- College of Agriculture, South China Agricultural University, Guangzhou, China
| | - Xiaolin Wang
- College of Agriculture, South China Agricultural University, Guangzhou, China
| | - Zhiyuan Tan
- College of Agriculture, South China Agricultural University, Guangzhou, China
| | - Guixiang Peng
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China
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Kou B, Yu T, Tang J, Zhu X, Yuan Y, Tan W. Kitchen compost-derived humic acid application promotes ryegrass growth and enhances the accumulation of Cd: An analysis of the soil microenvironment and rhizosphere functional microbes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 919:170879. [PMID: 38354798 DOI: 10.1016/j.scitotenv.2024.170879] [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: 11/04/2023] [Revised: 02/06/2024] [Accepted: 02/08/2024] [Indexed: 02/16/2024]
Abstract
Phytoremediation is an environmentally friendly and safe approach for remediating environments contaminated with heavy metals. Humic acid (HA) has high biological activity and can effectively complex with heavy metals. However, whether HA affects available Cd storage and the Cd accumulation ability of plants by altering the soil microenvironment and the distribution of special functional microorganisms remains unclear. Here, we investigated the effects of applying kitchen compost-derived HA on the growth and Cd enrichment capacity of ryegrass (Lolium perenne L.). Additionally, the key role of HA in regulating the structure of rhizosphere soil bacterial communities was identified. HA promoted the growth of perennial ryegrass and biomass accumulation and enhanced the Cd enrichment capacity of ryegrass. The positive effect of HA on the soil microenvironment and rhizosphere bacterial community was the main factor promoting the growth of ryegrass, and this was confirmed by the significant positive correlation between the ryegrass growth index and the content of SOM, AP, AK, and AN, as well as the abundance of rhizosphere growth-promoting bacteria such as Pseudomonas, Steroidobacter, Phenylobacterium, and Caulobacter. HA passivated Cd and inhibited the translocation capacity of ryegrass. The auxiliary effect of resistant bacteria on plants drove the absorption of Cd by ryegrass. In addition, HA enhanced the remediation of Cd-contaminated soil by ryegrass under different Cd levels, which indicated that kitchen compost-derived HA could be widely used for the phytoremediation of Cd-contaminated soil. Generally, our findings will aid the development of improved approaches for the use of kitchen compost-derived HA for the remediation of Cd-contaminated soil.
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Affiliation(s)
- Bing Kou
- State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; College of Urban and Environmental Science, Northwest University, Xi'an 710127, China
| | - Tingqiao Yu
- International Education College, Beijing Vocational College of Agriculture, Beijing 102442, China
| | - Jun Tang
- State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Xiaoli Zhu
- College of Urban and Environmental Science, Northwest University, Xi'an 710127, China
| | - Ying Yuan
- State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
| | - Wenbing Tan
- State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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Zhao Y, Yao J, Li H, Sunahara G, Li M, Tang C, Duran R, Ma B, Liu H, Feng L, Zhu J, Wu Y. Effects of three plant growth-promoting bacterial symbiosis with ryegrass for remediation of Cd, Pb, and Zn soil in a mining area. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 353:120167. [PMID: 38308995 DOI: 10.1016/j.jenvman.2024.120167] [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: 11/02/2023] [Revised: 01/01/2024] [Accepted: 01/20/2024] [Indexed: 02/05/2024]
Abstract
The quality of soil containing heavy metals (HMs) around nonferrous metal mining areas is often not favorable for plant growth. Three types of plant growth promoting rhizobacteria (PGPR)-assisted ryegrass were examined here to treat Cd, Pb, and Zn contaminated soil collected from a nonferrous metal smelting facility. The effects of PGPR-assisted plants on soil quality, plant growth, and the migration and transformation of HMs were evaluated. Results showed that inter-root inoculation of PGPR to ryegrass increased soil redox potential, urease, sucrase and acid phosphatase activities, microbial calorimetry, and bioavailable P, Si, and K content. Inoculation with PGPR also increased aboveground parts and root length, P, Si, and K contents, and antioxidant enzyme activities. The most significant effect was that the simultaneous inoculation of all three PGPRs increased the ryegrass extraction (%) of Cd (59.04-79.02), Pb (105.56-157.13), and Zn (27.71-40.79), compared to CK control (without fungi). Correspondingly, the inter-root soil contents (%) of total Cd (39.94-57.52), Pb (37.59-42.17), and Zn (34.05-37.28) were decreased compared to the CK1 control (without fungi and plants), whereas their bioavailability was increased. Results suggest that PGPR can improve soil quality in mining areas, promote plant growth, transform the fraction of HMs in soil, and increase the extraction of Cd, Pb, and Zn by ryegrass. PGPR is a promising microbe-assisted phytoremediation strategy that can promote the re-greening of vegetation in the mining area while remediating HMs pollution.
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Affiliation(s)
- Yan Zhao
- School of Water Resources and Environment, Research Center of Environmental Science and Engineering, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian District, 100083, Beijing, China
| | - Jun Yao
- School of Water Resources and Environment, Research Center of Environmental Science and Engineering, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian District, 100083, Beijing, China.
| | - Hao Li
- School of Water Resources and Environment, Research Center of Environmental Science and Engineering, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian District, 100083, Beijing, China
| | - Geoffrey Sunahara
- School of Water Resources and Environment, Research Center of Environmental Science and Engineering, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian District, 100083, Beijing, China; Department of Natural Resource Sciences, McGill University, 21111, Lakeshore Drive, Ste-Anne-de-Bellevue, Quebec, H9X 3V9, Canada
| | - Miaomiao Li
- School of Water Resources and Environment, Research Center of Environmental Science and Engineering, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian District, 100083, Beijing, China
| | - Chuiyun Tang
- School of Water Resources and Environment, Research Center of Environmental Science and Engineering, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian District, 100083, Beijing, China
| | - Robert Duran
- School of Water Resources and Environment, Research Center of Environmental Science and Engineering, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian District, 100083, Beijing, China; Universite de Pau et des Pays de l'Adour, E2S-UPPA, IPREM, 5254, BP 1155, 64013, Pau, Cedex, France
| | - Bo Ma
- School of Water Resources and Environment, Research Center of Environmental Science and Engineering, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian District, 100083, Beijing, China
| | - Houquan Liu
- School of Water Resources and Environment, Research Center of Environmental Science and Engineering, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian District, 100083, Beijing, China
| | - Lingyun Feng
- School of Water Resources and Environment, Research Center of Environmental Science and Engineering, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian District, 100083, Beijing, China
| | - Junjie Zhu
- School of Water Resources and Environment, Research Center of Environmental Science and Engineering, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian District, 100083, Beijing, China
| | - Yingjian Wu
- School of Water Resources and Environment, Research Center of Environmental Science and Engineering, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian District, 100083, Beijing, China
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Das S, Sarkar S. Arbuscular mycorrhizal fungal contribution towards plant resilience to drought conditions. FRONTIERS IN FUNGAL BIOLOGY 2024; 5:1355999. [PMID: 38434188 PMCID: PMC10904651 DOI: 10.3389/ffunb.2024.1355999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Accepted: 02/05/2024] [Indexed: 03/05/2024]
Abstract
Climate changes cause altering rainfall patterns resulting in an increase in drought occurrences globally. These events are disrupting plants and agricultural productivity. To evade droughts, plants try to adapt and modify in the best capacities possible. The plants have adapted by structurally modifying roots, stems, and leaves, as well as modifying functions. Lately, the association of microbial communities with plants has also been proven to be an important factor in aiding resilience. The fungal representatives of the microbial community also help safeguard the plants against drought. We discuss how these fungi associate with plants and contribute to evading drought stress. We specifically focus on Arbuscular mycorrhizal fungi (AMF) mediated mechanisms involving antioxidant defenses, phytohormone mediations, osmotic adjustments, proline expressions, fungal water absorption and transport, morphological modifications, and photosynthesis. We believe understanding the mechanisms would help us to optimize the use of fungi in agricultural practices. That way we could better prepare the plants for the anticipated future drought events.
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Affiliation(s)
- Subhadeep Das
- Department of Biochemistry, Purdue University, West Lafayette, IN, United States
| | - Soumyadev Sarkar
- Center for Fundamental and Applied Microbiomics, Biodesign Institute, Arizona State University, Tempe, AZ, United States
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Chebotar VK, Zaplatkin AN, Chizhevskaya EP, Gancheva MS, Voshol GP, Malfanova NV, Baganova ME, Khomyakov YV, Pishchik VN. Phytohormone Production by the Endophyte Bacillus safensis TS3 Increases Plant Yield and Alleviates Salt Stress. PLANTS (BASEL, SWITZERLAND) 2023; 13:75. [PMID: 38202382 PMCID: PMC10780329 DOI: 10.3390/plants13010075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 12/21/2023] [Accepted: 12/22/2023] [Indexed: 01/12/2024]
Abstract
Endophytic bacteria can be used to overcome the effect of salinity stress and promote plant growth and nutrient uptake. Bacillus safensis colonizes a wide range of habitats due to survival in extreme environments and unique physiological characteristics, such as a high tolerance for salt, heavy metals, and ultraviolet and gamma radiations. The aim of our study was to examine the salt resistance of the endophytic strain TS3 B. safensis and its ability to produce phytohormones and verify its effect on plant yield in field trials and the alleviation of salt stress in pot experiments. We demonstrate that the strain TS3 is capable of producing enzymes and phytohormones such as IAA, ABA and tZ. In pot experiments with radish and oat plants in salinization, the strain TS3 contributed to the partial removal of the negative effect of salinization. The compensatory effect of the strain TS3 on radish plants during salinization was 46.7%, and for oats, it was 108%. We suppose that such a pronounced effect on the plants grown and the salt stress is connected with its ability to produce phytohormones. Genome analysis of the strain TS3 showed the presence of the necessary genes for the synthesis of compounds responsible for the alleviation of the salt stress. Strain B. safensis TS3 can be considered a promising candidate for developing biofertilizer to alleviate salt stress and increase plant yield.
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Affiliation(s)
- Vladimir K. Chebotar
- All-Russia Research Institute for Agricultural Microbiology, Podbel’skogo Shosse 3, Pushkin, 196608 St. Petersburg, Russia; pisemnet-@mail.ru (A.N.Z.); (E.P.C.); (M.S.G.); (M.E.B.); (V.N.P.)
| | - Alexander N. Zaplatkin
- All-Russia Research Institute for Agricultural Microbiology, Podbel’skogo Shosse 3, Pushkin, 196608 St. Petersburg, Russia; pisemnet-@mail.ru (A.N.Z.); (E.P.C.); (M.S.G.); (M.E.B.); (V.N.P.)
| | - Elena P. Chizhevskaya
- All-Russia Research Institute for Agricultural Microbiology, Podbel’skogo Shosse 3, Pushkin, 196608 St. Petersburg, Russia; pisemnet-@mail.ru (A.N.Z.); (E.P.C.); (M.S.G.); (M.E.B.); (V.N.P.)
| | - Maria S. Gancheva
- All-Russia Research Institute for Agricultural Microbiology, Podbel’skogo Shosse 3, Pushkin, 196608 St. Petersburg, Russia; pisemnet-@mail.ru (A.N.Z.); (E.P.C.); (M.S.G.); (M.E.B.); (V.N.P.)
- Department of Genetics and Biotechnology, Faculty of Biology, Saint Petersburg State University, 199034 St. Petersburg, Russia
| | - Gerben P. Voshol
- Institute of Biology Leiden, Sylviusweg 72, 2333 BE Leiden, The Netherlands; (G.P.V.); (N.V.M.)
| | - Natalia V. Malfanova
- Institute of Biology Leiden, Sylviusweg 72, 2333 BE Leiden, The Netherlands; (G.P.V.); (N.V.M.)
| | - Maria E. Baganova
- All-Russia Research Institute for Agricultural Microbiology, Podbel’skogo Shosse 3, Pushkin, 196608 St. Petersburg, Russia; pisemnet-@mail.ru (A.N.Z.); (E.P.C.); (M.S.G.); (M.E.B.); (V.N.P.)
| | - Yuriy V. Khomyakov
- Agrophysical Scientific Research Institute, Grazhdansky pr. 14, 195220 St. Petersburg, Russia;
| | - Veronika N. Pishchik
- All-Russia Research Institute for Agricultural Microbiology, Podbel’skogo Shosse 3, Pushkin, 196608 St. Petersburg, Russia; pisemnet-@mail.ru (A.N.Z.); (E.P.C.); (M.S.G.); (M.E.B.); (V.N.P.)
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Tang J, Li Y, Zhang L, Mu J, Jiang Y, Fu H, Zhang Y, Cui H, Yu X, Ye Z. Biosynthetic Pathways and Functions of Indole-3-Acetic Acid in Microorganisms. Microorganisms 2023; 11:2077. [PMID: 37630637 PMCID: PMC10459833 DOI: 10.3390/microorganisms11082077] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Revised: 08/08/2023] [Accepted: 08/10/2023] [Indexed: 08/27/2023] Open
Abstract
Indole-3-acetic acid (IAA) belongs to the family of auxin indole derivatives. IAA regulates almost all aspects of plant growth and development, and is one of the most important plant hormones. In microorganisms too, IAA plays an important role in growth, development, and even plant interaction. Therefore, mechanism studies on the biosynthesis and functions of IAA in microorganisms can promote the production and utilization of IAA in agriculture. This mini-review mainly summarizes the biosynthesis pathways that have been reported in microorganisms, including the indole-3-acetamide pathway, indole-3-pyruvate pathway, tryptamine pathway, indole-3-acetonitrile pathway, tryptophan side chain oxidase pathway, and non-tryptophan dependent pathway. Some pathways interact with each other through common key genes to constitute a network of IAA biosynthesis. In addition, functional studies of IAA in microorganisms, divided into three categories, have also been summarized: the effects on microorganisms, the virulence on plants, and the beneficial impacts on plants.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - Zihong Ye
- Zhejiang Provincial Key Laboratory of Biometrology and Inspection & Quarantine, College of Life Sciences, China Jiliang University, Hangzhou 310018, China; (J.T.); (L.Z.)
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