Plant salicylic acid signaling is inhibited by a cooperative strategy of two powdery mildew effectors
文献类型： 外文期刊
作者： Liu, Yuhan 1 ; Li, Xiao 1 ; He, Qiguang 4 ; Zuo, Minghao 1 ; Guo, Yinjie 1 ; Liu, Lijuan 1 ; Yin, Jinyao 1 ; He, Lijuan 1 ; Li, Xiaoli 1 ; Shan, Jiaxin 1 ; Liu, Wenbo 1 ; Lin, Chunhua 1 ; Miao, Weiguo 1 ;
作者机构： 1.Hainan Univ, Sanya Nanfan Res Inst, Sch Trop Agr & Forestry, Key Lab Green Prevent & Control Trop Plant Dis, Haikou, Peoples R China
2.Hainan Univ, Sch Life & Hlth Sci, Haikou, Peoples R China
3.Hainan Univ, Danzhou Invas Species Observat & Res Stn Hainan Pr, Danzhou, Peoples R China
4.Chinese Acad Trop Agr Sci, Key Lab Biol & Genet Resources Rubber Tree, State Key Lab Incubat Base Cultivat & Physiol Trop, Rubber Res Inst,Minist Agr & Rural Affairs, Haikou, Peoples R China
关键词： powdery mildew; salicylic acid; effector protein; plant immunity; ubiquitination
期刊名称：MBIO （ 影响因子：4.7； 五年影响因子：5.5 ）
ISSN：
年卷期： 2025 年 16 卷 4 期
页码：
收录情况： SCI
摘要： Powdery mildew is a global threat to crops and economically valuable plants. Salicylic acid (SA) signaling plays a significant role in plant resistance to biotrophic parasites; however, the mechanisms behind how powdery mildew fungi circumvent SA-mediated resistance remain unclear. Many phytopathogenic microbes deliver effectors into the host to sustain infection. In this study, we showed that the rubber tree powdery mildew fungus Erysiphe quercicola inhibits host SA biosynthesis by employing two effector proteins, EqCmu and EqPdt. These effector proteins can be delivered into plant cells to hydrolyze chorismate, the main precursor of SA, through their enzymatic activities. Notably, EqCmu and EqPdt can interact with each other, providing mutual protection against protein degradation mediated by the plant ubiquitin-proteasome system. This interaction enhances their activities in the hydrolysis of chorismate. Our study reveals a new pathogenic strategy by which two powdery mildew effector proteins cooperate to evade recognition by dampening the host immune system.
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