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An RXLR effector PlAvh142 from Peronophythora litchii triggers plant cell death and contributes to virulence

文献类型： 外文期刊

作者： Situ, Junjian 1 ; Jiang, Liqun 1 ; Fan, Xiaoning 1 ; Yang, Wensheng 1 ; Li, Wen 1 ; Xi, Pinggen 1 ; Deng, Yizhen 1 ; Kong 1 ;

作者机构： 1.South China Agr Univ, Dept Plant Pathol, Guangdong Prov Key Lab Microbial Signals & Dis Co, Guangzhou 510642, Peoples R China

2.Guangdong Acad Agr Sci, Rice Res Inst, Guangdong Prov Key Lab New Technol Rice Breeding, Guangzhou, Peoples R China

关键词： cell death; Peronophythora litchii; plant immunity; RXLR effector

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 3 期

页码：

收录情况： SCI

摘要： Litchi downy blight, caused by the phytopathogenic oomycete Peronophythora litchii, results in tremendous economic loss in litchi production every year. To successfully colonize the host cell, Phytophthora species secret hundreds of RXLR effectors that interfere with plant immunity and facilitate the infection process. Previous work has already predicted 245 candidate RXLR effector-encoding genes in P. litchii, 212 of which have been cloned and tested for plant cell death-inducing activity in this study. We found three such RXLR effectors could trigger plant cell death through transient expression in Nicotiana benthamiana. Further experiments demonstrated that PlAvh142 could induce cell death and immune responses in several plants. We also found that PlAvh142 localized in both the cytoplasm and nucleus of plant cells. The cytoplasmic localization was critical for its cell death-inducing activity. Moreover, deletion either of the two internal repeats in PlAvh142 abolished the cell death-inducing activity. Virus-induced gene silencing assays showed that cell death triggered by PlAvh142 was dependent on the plant transduction components RAR1 (require for Mla12 resistance), SGT1 (suppressor of the G2 allele of skp1) and HSP90 (heat shock protein 90). Finally, knockout of PlAvh142 resulted in significantly attenuated P. litchii virulence on litchi plants, whereas the PlAvh142-overexpressed mutants were more aggressive. These data indicated that PlAvh142 could be recognized in plant cytoplasm and is an important virulence RXLR effector of P. litchii.

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