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Elevating plant immunity by translational regulation of a rice WRKY transcription factor

文献类型： 外文期刊

作者： Zheng, Chao 1 ; Zhou, Jie 1 ; Yuan, Xiaoya 1 ; Zheng, Ersong 1 ; Liu, Xiuli 1 ; Cui, Weijun 1 ; Yan, Chengqi 3 ; Wu, Yueyan 4 ; Ruan, Wenyuan 5 ; Yi, Keke 5 ; Chen, Jianping 1 ; Wang, Xuming 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, State Key Lab Managing Biot & Chem Threats Qual &, Zhejiang Prov Key Lab Plant Virol, Minist Agr,Key Lab Plant Protect & Biotechnol,Inst, Hangzhou, Peoples R China

2.Northwest A&F Univ, Coll Plant Protect, Yangling, Peoples R China

3.Ningbo Acad Agr Sci, Inst Biotechnol, Ningbo, Peoples R China

4.Zhejiang Wan Li Univ, Ningbo, Peoples R China

5.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing, Peoples R China

6.Ningbo Univ, Inst Plant Virol, Ningbo, Peoples R China

关键词： OsWRKY7; alternative translation; protein stability; basal immunity; Xoo

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：13.8； 五年影响因子：13.2 ）

ISSN： 1467-7644

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Plants have intricate mechanisms that tailor their defence responses to pathogens. WRKY transcription factors play a pivotal role in plant immunity by regulating various defence signalling pathways. Many WRKY genes are transcriptionally activated upon pathogen attack, but how their functions are regulated after transcription remains elusive. Here, we show that OsWRKY7 functions as a crucial positive regulator of rice basal immunity against Xanthomonas oryzae pv. oryzae (Xoo). The activity of OsWRKY7 was regulated at both translational and post-translational levels. Two translational products of OsWRKY7 were generated by alternative initiation. The full-length OsWRKY7 protein is normally degraded by the ubiquitin-proteasome system but was accumulated following elicitor or pathogen treatment, whereas the alternate product initiated from the downstream in-frame start codon was stable. Both the full and alternate OsWRKY7 proteins have transcriptional activities in yeast and rice cells, and overexpression of each form enhanced resistance to Xoo infection. Furthermore, disruption of the main AUG in rice increased the endogenous translation of the alternate stabilized form of OsWRKY7 and enhanced bacterial blight resistance. This study provides insights into the coordination of alternative translation and protein stability in the regulation of plant growth and basal defence mediated by the OsWRKY7 transcription factor, and also suggests a promising strategy to breed disease-resistant rice by translation initiation control.

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