Functional activity of endophytic bacteria G9H01 with high salt tolerance and anti- Magnaporthe oryzae that isolated from saline-alkali-tolerant rice

文献类型： 外文期刊

第一作者： Wang, Zhishan

作者： Wang, Zhishan;Liu, Yang;Li, Ni;Wang, Weiping;Xu, Youqiang

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关键词： Saline-alkali tolerant rice; Genomic analysis; Antagonistic action; Salt tolerance

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2024 年 926 卷

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收录情况： SCI

摘要： It holds significant practical importance to screen and investigate endophytic bacteria with salt -tolerant activity in rice for the development of relevant microbial agents. A total of 179 strains of endophytic bacteria were isolated from 24 samples of salt -tolerant rice seeds, with almost 95 % of these bacteria exhibiting tolerance to a salt content of 2 % (0.34 mol/L). Following the screening process, a bacterium named G9H01 was identified, which demonstrated a salt tolerance of up to 15 % (2.57 mol/L) and resistance to Magnaporthe oryzae , the causal agent of rice blast disease. Phylogenetic analysis confirmed G9H01 as a strain of Bacillus paralicheniformis . The complete genome of G9H01 was sequenced and assembled, revealing a considerable number of genes encoding proteins associated with salt tolerance. Further analysis indicated that G9H01 may alleviate salt stress in a highsalt environment through various mechanisms. These mechanisms include the utilization of proteins such as K + transporters, antiporters, and Na + /H + antiporters, which are involved in K + absorption and Na + excretion. G9H01 also demonstrated the ability to uptake and accumulate betaine, as well as secrete extracellular polysaccharides. Collectively, these findings suggest that Bacillus paralicheniformis G9H01 has potential as a biocontrol agent, capable of promoting rice growth under saline -alkali -tolerant conditions.

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