Suppression of Jasmonic Acid-Mediated Defense by Viral-Inducible MicroRNA319 Facilitates Virus Infection in Rice
文献类型: 外文期刊
第一作者: Zhang, Chao
作者: Zhang, Chao;Ding, Zuomei;Wu, Kangcheng;Yang, Liang;Li, Yang;Yang, Zhen;Shi, Shan;Liu, Xiaojuan;Zheng, Luping;Wei, Juan;Du, Zhenguo;Wu, Zujian;Wu, Jianguo;Zhao, Shanshan;Yang, Zhirui;Wang, Yu;Li, Yi;Wu, Jianguo;Zhang, Aihong;Miao, Hongqin
作者机构:
关键词: miR319;rice ragged stunt virus;RRSV;TCP21;viral infection;jasmonic acid
期刊名称:MOLECULAR PLANT ( 影响因子:13.164; 五年影响因子:16.357 )
ISSN: 1674-2052
年卷期: 2016 年 9 卷 9 期
页码:
收录情况: SCI
摘要: MicroRNAs (miRNAs) are pivotal modulators of plant development and host-virus interactions. However, the roles and action modes of specific miRNAs involved in viral infection and host susceptibility remain largely unclear. In this study, we show that Rice ragged stunt virus (RRSV) infection caused increased accumulation of miR319 but decreased expression of miR319-regulated TCP (TEOSINTE BRANCHED/CYCLOIDEA/PCF) genes, especially TCP21, in rice plants. Transgenic rice plants overexpressing miR319 or downregulating TCP21 exhibited disease-like phenotypes and showed significantly higher susceptibility to RRSV in comparison with the wild-type plants. In contrast, only mild disease symptoms were observed in RRSV-infected lines overexpressing TCP21 and especially in the transgenic plants overexpressing miR319-resistant TCP21. Both RRSV infection and overexpression of miR319 caused the decreased endogenous jasmonic acid (JA) levels along with downregulated expression of JA biosynthesis and signaling-related genes in rice. However, treatment of rice plants with methyl jasmonate alleviated disease symptoms caused by RRSV and reduced virus accumulation. Taken together, our results suggest that the induction of miR319 by RRSV infection in rice suppresses JA-mediated defense to facilitate virus infection and symptom development.
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