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OsRDR6 plays role in host defense against double-stranded RNA virus, Rice Dwarf Phytoreovirus

文献类型： 外文期刊

作者： Hong, Wei 1 ; Qian, Dan 1 ; Sun, Runhong 1 ; Jiang, Lin 1 ; Wang, Yu 1 ; Wei, Chunhong 1 ; Zhang, Zhongkai 3 ; Li, Yi 1 ;

作者机构： 1.Peking Univ, Coll Life Sci, State Key Lab Prot & Plant Gene Res, Beijing 100871, Peoples R China

2.Henan Acad Agr Sci, Inst Plant Protect, Henan Key Lab Crop Pest Control, Zhengzhou 450002, Peoples R China

3.Yunnan Acad Agr Sci, Key Lab Southwestern Crop Gene Resources & Germpl, Yunnan Prov Key Lab Agr Biotechnol, Minist Agr,Biotechnol & Germplasm Resources Inst, Kunming 650223, Peoples R China

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2015 年 5 卷

页码：

收录情况： SCI

摘要： RNAi is a major antiviral defense response in plant and animal model systems. RNA-dependent RNA polymerase 6 (RDR6) is an essential component of RNAi, which plays an important role in the resistance against viruses in the model plants. We found previously that rice RDR6 (OsRDR6) functioned in the defense against Rice stripe virus (RSV), and Rice Dwarf Phytoreovirus (RDV) infection resulted in down-regulation of expression of RDR6. Here we report our new findings on the function of OsRDR6 against RDV. Our result showed that down-regulation of OsRDR6 through the antisense (OsRDR6AS) strategy increased rice susceptibility to RDV infection while over-expression of OsRDR6 had no effect on RDV infection. The accumulation of RDV vsiRNAs was reduced in the OsRDR6AS plants. In the OsRDR6 over-expressed plants, the levels of OsRDR6 RNA transcript and protein were much higher than that in the control plants. Interestingly, the accumulation level of OsRDR6 protein became undetectable after RDV infection. This finding indicated that the translation and/or stability of OsRDR6 protein were negatively impacted upon RDV infection. This new finding provides a new light on the function of RDR6 in plant defense response and the cross-talking between factors encoded by host plant and double-stranded RNA viruses.

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