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RpoE Orchestrates Oxidative Stress Adaptation, Virulence, and Dual Plant Immune Modulation in Xanthomonas axonopodis pv. glycines

文献类型： 外文期刊

作者： Huiya Geng;Ruyi Su;Yifei Tao;Wenyao Huang;Zihan Zhou;Houyu Zhou;Qian Su;Xia Liu;Zhiyuan Ji;Wei Guo

作者机构：

关键词： expression regulation;oxidative stress adaptation;RpoE sigma factor;virulence mechanisms;Xanthomonas axonopodis pv. glycines

期刊名称： Journal of Agricultural and Food Chemistry

ISSN： 0021-8561

年卷期： 2025 年 73 卷 18 期

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： In Xanthomonas axonopodis pv. glycines (Xag), rpoE (encoding σE) resided within the conserved rseA-mucD operon but was dually repressed by DSF signaling and the global regulator Clp. Although H2O2 induced rpoE transcription, its expression was paradoxically downregulated by H2O2-detoxification genes (oxyR, ahpC, ahpF, catB), suggesting a potential feedback loop. Notably, the rpoE mutant exhibited attenuated soybean virulence characterized by (1) reduced cell wall-degrading enzymes (CWDEs) production, leading to diminished activation of soybean innate immunity (ROS burst, callose deposition, programmed cell death, and jasmonic acid accumulation); (2) increased H2O2 sensitivity with impaired siderophore-mediated iron acquisition; (3) failure to elicit hypersensitive response (HR) in nonhosts. Significantly, rpoE complementation fully restored virulence traits. Collectively, RpoE emerges as a central regulator orchestrating oxidative stress adaptation, stealth pathogenesis via CWDEs-mediated immune suppression, and host-specific virulence/HR elicitation in Xag through its unique network, redefining sigma factor functionality in xanthomonads and providing targets for disrupting pathogen-host interactions.

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