The seed endophytic microbe Microbacterium testaceum M15 enhances the cold tolerance and growth of rice (Oryza sativa L.)

文献类型： 外文期刊

第一作者： Zhao, Jintong

作者： Zhao, Jintong;Xu, Guoshun;Luo, Huiying;Yao, Bin;Tian, Jian;Zhao, Jintong;Delaplace, Pierre;Zhao, Jintong;Liu, Xiaoqing;Guan, Feifei;Zhang, Wei;Wu, Ningfeng;Zhang, Chunyi;Hou, Ligang;Zhang, Chunyi

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关键词： Cold tolerance; Endophytic microbes; Microbacterium testaceum; Phosphate solubilization; Sustainable agriculture

期刊名称：MICROBIOLOGICAL RESEARCH （ 影响因子：6.9； 五年影响因子：7.2 ）

ISSN： 0944-5013

年卷期： 2024 年 289 卷

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收录情况： SCI

摘要： The potential of seed endophytic microbes to enhance plant growth and resilience is well recognized, yet their role in alleviating cold stress in rice remains underexplored due to the complexity of these microbial communities. In this study, we investigated the diversity of seed endophytic microbes in two rice varieties, the coldsensitive CB9 and the cold-tolerant JG117. Our results revealed significant differences in the abundance of Microbacteriaceae, with JG117 exhibiting a higher abundance under both cold stress and room temperature conditions compared to CB9. Further analysis led to the identification of a specific cold-tolerant microbe, Microbacterium testaceum M15, in JG117 seeds. M15-inoculated CB9 plants showed enhanced growth and cold tolerance, with a germination rate increase from 40 % to 56.67 % at 14 degrees C and a survival rate under cold stress (4 degrees C) doubling from 22.67 % to 66.67 %. Additionally, M15 significantly boosted chlorophyll content by over 30 %, increased total protein by 16.31 %, reduced malondialdehyde (MDA) levels by 37.76 %, and increased catalase activity by 26.15 %. Overall, our study highlights the potential of beneficial endophytic microbes like M. testaceum M15 in improving cold tolerance in rice, which could have implications for sustainable agricultural practices and increased crop productivity in cold-prone regions.

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