The essential effector SCRE1 in Ustilaginoidea virens suppresses rice immunity via a small peptide region

文献类型： 外文期刊

第一作者： Zhang, Nan

作者： Zhang, Nan;Yang, Jiyun;Fang, Anfei;Wang, Jiyang;Li, Yuejiao;Wang, Shanzhi;Cui, Fuhao;Peng, You-Liang;Sun, Wenxian;Zhang, Nan;Yang, Jiyun;Fang, Anfei;Wang, Jiyang;Li, Yuejiao;Wang, Shanzhi;Cui, Fuhao;Peng, You-Liang;Sun, Wenxian;Li, Dayong;Sun, Wenxian;Yu, Junjie;Liu, Yongfeng;Peng, You-Liang

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关键词： fungal effector; immunosuppressive peptide; rice immunity; SCRE1; Ustilaginoidea virens

期刊名称：MOLECULAR PLANT PATHOLOGY （ 影响因子：5.663； 五年影响因子：5.626 ）

ISSN： 1464-6722

年卷期： 2020 年 21 卷 4 期

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收录情况： SCI

摘要： The biotrophic fungal pathogen Ustilaginoidea virens causes rice false smut, a newly emerging plant disease that has become epidemic worldwide in recent years. The U. virens genome encodes many putative effector proteins that, based on the study of other pathosystems, could play an essential role in fungal virulence. However, few studies have been reported on virulence functions of individual U. virens effectors. Here, we report our identification and characterization of the secreted cysteine-rich protein SCRE1, which is an essential virulence effector in U. virens. When SCRE1 was heterologously expressed in Magnaporthe oryzae, the protein was secreted and translocated into plant cells during infection. SCRE1 suppresses the immunity-associated hypersensitive response in the nonhost plant Nicotiana benthamiana. Induced expression of SCRE1 in rice also inhibits pattern-triggered immunity and enhances disease susceptibility to rice bacterial and fungal pathogens. The immunosuppressive activity is localized to a small peptide region that contains an important 'cysteine-proline-alanine-arginine-serine' motif. Furthermore, the scre1 knockout mutant generated using the CRISPR/Cas9 system is attenuated in U. virens virulence to rice, which is greatly complemented by the full-length SCRE1 gene. Collectively, this study indicates that the effector SCRE1 is able to inhibit host immunity and is required for full virulence of U. virens.

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