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Background and aims <p>Salinity is one of the main abiotic stresses affecting global plant growth and agricultural productivity. Plant growth-promoting rhizobacteria (PGPR) have been widely studied as an eco-friendly tool to enhance plant salt tolerance. The salt tolerance of plants mediated by volatile organic compounds (VOCs) and the feedback regulation of plants on bacteria are still unclear. The aim of this study is to elucidate the signal exchange and reciprocal mechanism between pepper and PGPR mediated by bacterial VOCs and pepper REs under salt stress conditions.</p> Methods <p>This research constructed a co-culture system of <i>Enterobacter hormaechei</i> WU-15 with pepper seedlings to evaluate the effects of VOCs produced by WU-15 on the growth and salt tolerance of pepper seedlings, as well as WU-15's response strategies to the root exudates (REs) of pepper seedlings.</p> Results <p>WU-15 VOCs protected seedlings exposed to salt stress from oxidative damage by regulated osmoprotective responses, photosynthetic efficiency, and antioxidant defense systems. Meanwhile, the REs from pepper seedlings improved WU-15’s capabilities in growth, biofilm formation, phosphate solubilization, and IAA production. The salt-tolerant growth of pepper seedlings mediated by WU-15 VOCs and the enhancing effect of pepper REs on the salt-solubilizing and growth-promoting function of WU-15 strain were clarified.</p> Conclusion <p>This study reports for the first time that VOCs released by WU-15 promote salt tolerant growth in pepper seedlings, and identifies key compounds that regulate pepper antioxidant defense. It also reveals the mechanism by which chili peppers regulate WU-15 growth and metabolism through REs feedback.</p>

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Microbe-plant synergistic interactions: Mechanism of VOCs promotion on salt tolerance in pepper seedlings and the feedback of root exudates on Enterobacter hormaechei WU-15

  • 期刊论文

  • 发表日期：

    2025年10月26日

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  • Zhennan Wen,
  • Jinhui Chu,
  • Qikai Fu,
  • Xiaohao Wang,
  • Xiaolin Xu

摘要

Background and aims

Salinity is one of the main abiotic stresses affecting global plant growth and agricultural productivity. Plant growth-promoting rhizobacteria (PGPR) have been widely studied as an eco-friendly tool to enhance plant salt tolerance. The salt tolerance of plants mediated by volatile organic compounds (VOCs) and the feedback regulation of plants on bacteria are still unclear. The aim of this study is to elucidate the signal exchange and reciprocal mechanism between pepper and PGPR mediated by bacterial VOCs and pepper REs under salt stress conditions.

Methods

This research constructed a co-culture system of Enterobacter hormaechei WU-15 with pepper seedlings to evaluate the effects of VOCs produced by WU-15 on the growth and salt tolerance of pepper seedlings, as well as WU-15's response strategies to the root exudates (REs) of pepper seedlings.

Results

WU-15 VOCs protected seedlings exposed to salt stress from oxidative damage by regulated osmoprotective responses, photosynthetic efficiency, and antioxidant defense systems. Meanwhile, the REs from pepper seedlings improved WU-15’s capabilities in growth, biofilm formation, phosphate solubilization, and IAA production. The salt-tolerant growth of pepper seedlings mediated by WU-15 VOCs and the enhancing effect of pepper REs on the salt-solubilizing and growth-promoting function of WU-15 strain were clarified.

Conclusion

This study reports for the first time that VOCs released by WU-15 promote salt tolerant growth in pepper seedlings, and identifies key compounds that regulate pepper antioxidant defense. It also reveals the mechanism by which chili peppers regulate WU-15 growth and metabolism through REs feedback.