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Botrytis cinerea BcSSP2 protein is a late infection phase, cytotoxic effector

文献类型： 外文期刊

作者： Zhu, Wenjun 1 ; Yu, Mengxue 1 ; Xu, Ran 1 ; Bi, Kai 1 ; Yu, Shuang 1 ; Xiong, Chao 1 ; Liu, Zhiguo 1 ; Sharon, Amir 2 ; Jiang, Daohong 3 ; Wu, Mingde 3 ; Gu, Qiongnan 4 ; Gong, Ling 5 ; Chen, Weidong 6 ; Wei, Wei 6 ;

作者机构： 1.Wuhan Polytech Univ, Sch Life Sci & Technol, Wuhan 430023, Hubei, Peoples R China

2.Tel Aviv Univ, Fac Life Sci, Sch Plant Sci & Food Secur, IL-69978 Tel Aviv, Israel

3.Huazhong Agr Univ, State Key Lab Agr Microbiol, Wuhan 430070, Hubei, Peoples R China

4.Hubei Acad Agr Sci, Inst Plant Protect & Soil Fertilizer, Wuhan 430064, Hubei, Peoples R China

5.Hubei Univ Chinese Med, Pharm Fac, Wuhan 430065, Hubei, Peoples R China

6.Washington State Univ, Dept Plant Pathol, USDA ARS, Pullman, WA 99164 USA

期刊名称：ENVIRONMENTAL MICROBIOLOGY （ 影响因子：5.476； 五年影响因子：6.82 ）

ISSN： 1462-2912

年卷期：

页码：

收录情况： SCI

摘要： Botrytis cinerea is a broad-host-range necrotrophic phytopathogen responsible for serious diseases in leading crops. To facilitate infection, B. cinerea secretes a large number of effectors that induce plant cell death. In screening secretome data of B. cinerea during infection stage, we identified a phytotoxic protein (BcSSP2) that can also induce immune resistance in plants. BcSSP2 is a small, cysteine-rich protein without any known domains. Transient expression of BcSSP2 in leaves caused chlorosis that intensifies with time and eventually leads to death. Point mutations in eight of 10 cysteine residues abolished phytotoxicity, but residual toxic activity remained after heating treatment, suggesting contribution of unknown epitopes to protein phytotoxicity. The expression of bcssp2 was low during the first 36 h after inoculation and increased sharply upon transition to late infection stage. Deletion of bcssp2 did not cause statistically significant changes in lesions size on bean and tobacco leaves. Further analyses indicated that the phytotoxicity of BcSSP2 is negatively regulated by the receptor-like kinases BAK1 and SOBIR1. Collectively, our findings show that BcSSP2 is an effector protein that toxifies the host cells, but is also recognized by the plant immune system.

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