RpoE Orchestrates Oxidative Stress Adaptation, Virulence, and Dual Plant Immune Modulation in Xanthomonas axonopodis pv. glycines
文献类型： 外文期刊
第一作者： Geng, Huiya
作者： Geng, Huiya;Su, Ruyi;Tao, Yifei;Huang, Wenyao;Zhou, Zihan;Zhou, Houyu;Su, Qian;Liu, Xia;Guo, Wei;Ji, Zhiyuan
作者机构：
关键词：
RpoE sigma factor;
期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：6.2； 五年影响因子：6.4 ）
ISSN： 0021-8561
年卷期： 2025 年 73 卷 18 期
页码：
收录情况： SCI
摘要： In Xanthomonas axonopodis pv. glycines (Xag), rpoE (encoding sigma E) 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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