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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.

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