Abstract
Environmental challenges like salinity, drought, fungal phytopathogens, and pesticides directly or/and indirectly influence the environment and agricultural yields. Certain beneficial endophytic Streptomyces sp. can ameliorate environmental stresses and be utilized as crop growth promoters under adverse conditions. Herein, Streptomyces dioscori SF1 (SF1) isolated from seeds of Glycyrrhiza uralensis tolerated fungal phytopathogens and abiotic stresses (drought, salt, and acid base). Strain SF1 showed multifarious plant growth promotion characteristics, including the production of indole acetic acid (IAA), ammonia, siderophores, ACC deaminase, extracellular enzymes, the ability of potassium solubilization, and nitrogen fixation. The dual plate assay showed that strain SF1 inhibited 63.21 ± 1.53%, 64.84 ± 1.35%, and 74.19 ± 2.88% of Rhizoctonia solani, Fusarium acuminatum, and Sclerotinia sclerotiorum, respectively. The detached root assays showed that strain SF1 significantly reduced the number of rotten sliced roots, and the biological control effect on sliced roots of Angelica sinensis, Astragalus membranaceus, and Codonopsis pilosula was 93.33%, 86.67%, and 73.33%, respectively. Furthermore, the strain SF1 significantly increased the growth parameters and biochemical indicators of adversity in G. uralensis seedlings under drought and/or salt conditions, including radicle length and diameter, hypocotyl length and diameter, dry weight, seedling vigor index, antioxidant enzyme activity, and non-enzymatic antioxidant content. In conclusion, the strain SF1 can be used to develop environmental protection biological control agents, improve the anti-disease activity of plants, and promote plant growth in salinity soil within arid and semi-arid regions.
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The authors are thankful for the financial support provided by the project of the Ningxia Science and Technology Innovation Leader Program (2020GKLRLX12), the Ningxia Natural Science Foundation (2022AAC02037), and the National Natural Science Foundation of China (82160724).
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XK Li conducted all the experiments and wrote the manuscript. DY Lang conducted part of the experiments and collected references. JH Wang conducted part of the experiment. WJ Zhang made the figures and tables and modified the language. XH Zhang contributed the ideas and revised the manuscript. All authors read and approved the final manuscript.
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Li, X., Lang, D., Wang, J. et al. Plant-beneficial Streptomyces dioscori SF1 potential biocontrol and plant growth promotion in saline soil within the arid and semi-arid areas. Environ Sci Pollut Res 30, 70194–70212 (2023). https://doi.org/10.1007/s11356-023-27362-x
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DOI: https://doi.org/10.1007/s11356-023-27362-x