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

文献类型： 外文期刊

第一作者： Zhu, Wenjun

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

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

ISSN： 1462-2912

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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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