The Dual Effect of the Brassinosteroid Pathway on Rice Black-Streaked Dwarf Virus Infection by Modulating the Peroxidase-Mediated Oxidative Burst and Plant Defense
文献类型： 外文期刊
作者： Zhang, Hehong 1 ; He, Yuqing 3 ; Tan, Xiaoxiang 2 ; Xie, Kaili 1 ; Li, Lulu 1 ; Hong, Gaojie 3 ; Li, Junmin 2 ; Cheng, Ye 2 ;
作者机构： 1.Nanjing Agr Univ, Coll Plant Protect, Nanjing, Jiangsu, Peoples R China
2.Ningbo Univ, Inst Plant Virol, Ningbo, Zhejiang, Peoples R China
3.Zhejiang Acad Agr Sci, Inst Virol & Biotechnol, China & Key Lab Biotechnol Plant Protect MOA Chin, State Key Lab Breeding Base Sustainable Control P, Hangzhou 310021, Zhejiang, Peoples R China
期刊名称：MOLECULAR PLANT-MICROBE INTERACTIONS （ 影响因子：4.171； 五年影响因子：4.836 ）
ISSN： 0894-0282
年卷期： 2019 年 32 卷 6 期
页码：
收录情况： SCI
摘要： The phytohormone brassinosteroid (BR) not only plays key roles in regulating plant growth and development but is also involved in modulating the plant defense system in response to pathogens. We previously found that BR application made rice plants more susceptible to the devastating pathogen rice black-streaked dwarf virus (RBSDV), but the mechanism of BR-mediated susceptibility remains unclear. We now show that both BR-deficient and -insensitive mutants are resistant to RBSDV infection. High-throughput sequencing showed that the defense hormone salicylic acid and jasmonic acid pathways were activated in the RBSDV-infected BR mutant. Meanwhile, a number of class III peroxidases (OsPrx) were significantly changed and basal reactive oxygen species (ROS) accumulated in BR mutants. Treatment with exogenous hormones and other chemicals demonstrated that the BR pathway could suppress the levels of OsPrx and the ROS burst by directly binding the promoters of OsPrx genes. Together, our findings indicate that BR-mediated susceptibility is at least partly caused by inhibition of the action of defense hormones, preventing the accumulation of the peroxidase-mediated oxidative burst.
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