数字农科院2.0

Endophytic bacteria Priestia megaterium 170T-4 improves soybean salt tolerance through regulation of ion homeostasis and phytohormone signaling pathways

文献类型： 外文期刊

作者： Shutian Hua;Ruiyao Liu;Zhe Li;Han Zheng;Yanfen Zheng;Youqiang Wang;Cheng Sheng Zhang;Ziyan Wang;Mingguo Jiang

作者机构：

关键词： endophytic bacteria;plant growth-promoting rhizobacteria;Priestia megaterium 170T-4;salt stress;soybean

期刊名称： Frontiers in Microbiology

ISSN： 1664-302X

年卷期： 2025 年 16 卷

页码：

收录情况： SCIE（2025版）

摘要： Salt stress in coastal saline-alkali soils impairs plant survival and growth. Plant growth-promoting rhizosphere bacteria (PGPR) and endophytic bacteria can enhance salinity tolerance via stable host associations. This study used culture-based and transcriptomic methods to investigate culturable endophytic bacteria in soybean and their salt-tolerance mechanisms. A total of 154 strains were isolated from the roots of 10 soybean varieties cultivated in coastal saline-alkali soil, spanning 4 phyla, 35 genera, and 76 species. Microbacterium phyllosphaerae and Priestia megaterium were identified as dominant species, from which two representative strains were selected to assess their growth-promoting effects under salt stress. Strain 170T-4 was identified as P. megaterium via multilocus sequence analysis and showed high salt tolerance, growing in up to 6% NaCl. Pot experiments showed that strain 170T-4 significantly improved plant height, root elongation, Na+/K+ homeostasis, proline, and chlorophyll content. Transcriptome profiling and RT-qPCR revealed that strain 170T-4 regulates K+ transport-related genes (GORK and SKOR), ethylene signaling related genes (PTI5, EIN3, and ERF1), and the allene oxide cyclase gene (AOC). Overall, strain 170T-4 improved soybean growth under salt stress by modulating ion transport, osmotic responses, and hormone signaling, showing strong potential as a microbial inoculant for saline-alkali soils.

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