一个oomycete效应器针对宿主calmodulin抑制植物免疫力
Peng Li1,2, Lizhu Xie1, Wen Li1,2
1National Key Laboratory of Green Pesticide/Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University, Guangzhou, 510642, China.
The Plant journal : for cell and molecular biology
|September 6, 2025
概括
通过向信号, 抑制植物免疫力. 这项研究揭示了Peronophythora litchii中的Plavh222如何破坏平衡,促进果树的疾病.
科学领域:
- 植物病理学
- 分子植物微生物相互作用
- 虫病原体
背景情况:
- 虫病对热带和亚热带水果树构成重大威胁.
- 这些植物中菌体免疫抑制的分子机制尚不清楚.
- 菌体效应体是植物病变的关键毒性因素.
研究的目的:
- 调查Peronophythora litchii中保存的RXLR类效应物Plavh222在虫免疫中的作用.
- 阐明PlAvh222抑制植物免疫反应的分子机制.
- 为了确定参与毒性的Plavh222宿主目标.
主要方法:
- 研究了PlAvh222在利奇和尼科蒂安班塔米亚的毒性.
- 在实验室和体内评估了Plavh222与石灰石素 (LcCaM) 的相互作用.
- 使用基因沉默来研究NbCaMs在Plavh222中介敏感性的作用.
- 分析了Plavh222-LcCaM相互作用对编程细胞死亡 (PCD) 和活性氧物种 (ROS) 爆发的影响.
- 在效应器与宿主相互作用后测量细胞质 ([Ca2+]cyt) 水平.
主要成果:
- PlAvh222对于Peronophythora litchii的完全毒性至关重要.
- PlAvh222抑制了INF1诱导的免疫反应,并增强了N. benthamiana的Phytophthora capsici感染.
- PlAvh222 直接与利奇卡尔莫杜林 (LcCaM) 相互作用.
- 抑制NbCaM降低了Plavh222增强N. benthamiana易感性的能力.
- 效应器通过其C端区域准LcCaM,抑制PCD和ROS爆发.
- PlAvh222与LcCaM的相互作用会增加LcCaM的积累并降低细胞质Ca2+水平.
- 细胞 Ca2+ 流量减少会影响 N. benthamiana 的 PCD.
结论:
- 菌因子Plavh222通过抑制依赖的植物免疫来促进病原体感染.
- PlAvh222 操纵宿主卡尔莫杜林以破坏信号传递并逃避免疫反应.
- 了解这种效应体与宿主相互作用,可以了解虫病原和疾病控制的潜在目标.
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