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Background and aims <p>Rare microbial taxa play crucial roles in plant responses to abiotic stress; however, their dynamics in the rhizosphere under salt stress are not yet well understood. Specifically, the mechanisms by which different salt stress types regulate the diversity and composition of rare bacterial communities via root exudates are unclear.</p> Methods <p>This study employed targeted metabolomics and 16S rRNA sequencing to investigate the impacts of three types of salt stress (alkaline, neutral and mixed) on the root exudates and rhizosphere rare bacteria of <i>Leymus chinensis</i> in a pot experiment.</p> Results <p>The composition of root exudates (11.7%, <i>P</i> &lt; 0.05) significantly influenced the composition of rare bacterial communities in the rhizosphere; however, their quantitative impact was smaller than that of soil pH (33.8%, <i>P</i> &lt; 0.001). <i>L. chinensis</i> mitigated the effects of alkaline and mixed salt stress on the diversity and evenness of rare microbial communities by increasing the C:N ratio of root exudates, though this adjustment may also inhibit the stability of rare microbial networks. Salt stress&#xa0;associated changes in electrical conductivity induced differential secretion of root exudates, which promoted the diversity and evenness of microbial communities.</p> Conclusion <p>Salt stress type specific regulation in rhizosphere rare bacteria diversity and network stability provides a theoretical basis for the precise management of microbial functional groups in saline soils.</p>

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Different salt stress types regulated rhizosphere rare bacterial communities through root exudates and soil physicochemical properties

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Xiao-Chong Zhang,
  • Hui-Liang Zhai,
  • Hui-Ying Xu,
  • Wen-Zheng Song,
  • Min Liu,
  • Xiao-Feng Dong,
  • Wei Sun,
  • Jian-Ying Ma

摘要

Background and aims

Rare microbial taxa play crucial roles in plant responses to abiotic stress; however, their dynamics in the rhizosphere under salt stress are not yet well understood. Specifically, the mechanisms by which different salt stress types regulate the diversity and composition of rare bacterial communities via root exudates are unclear.

Methods

This study employed targeted metabolomics and 16S rRNA sequencing to investigate the impacts of three types of salt stress (alkaline, neutral and mixed) on the root exudates and rhizosphere rare bacteria of Leymus chinensis in a pot experiment.

Results

The composition of root exudates (11.7%, P < 0.05) significantly influenced the composition of rare bacterial communities in the rhizosphere; however, their quantitative impact was smaller than that of soil pH (33.8%, P < 0.001). L. chinensis mitigated the effects of alkaline and mixed salt stress on the diversity and evenness of rare microbial communities by increasing the C:N ratio of root exudates, though this adjustment may also inhibit the stability of rare microbial networks. Salt stress associated changes in electrical conductivity induced differential secretion of root exudates, which promoted the diversity and evenness of microbial communities.

Conclusion

Salt stress type specific regulation in rhizosphere rare bacteria diversity and network stability provides a theoretical basis for the precise management of microbial functional groups in saline soils.