3 years ago

Rice black‐streaked dwarf virus P10 acts as either a synergistic or an antagonistic determinant during superinfection with related or unrelated virus

Hehong Zhang, Xiaoxiang Tan, Yuqing He, Kaili Xie, Lulu Li, Rong Wang, Gaojie Hong, Junmin Li, Jing Li, Michael Taliansky, Stuart MacFarlane, Fei Yan, Jianping Chen, Zongtao Sun

Summary

Rice black‐streaked dwarf virus (RBSDV), a member of the genus Fijivirus, is a devastating pathogen of crop plants. RBSDV S10 encodes a capsid protein (P10) that is an important component of the double‐layered particle. However, little information is available on the roles of RBSDV P10 in viral infection or in interactions with other viruses. Here we demonstrate that expressing P10 in plants alleviated the symptoms of both RBSDV and the closely‐related southern rice black‐streaked dwarf virus (SRBSDV), and reduced the disease incidence, but made the plants more susceptible to the unrelated rice stripe virus (RSV). Further experiments suggested that P10‐mediated resistance to RBSDV and SRBSDV operated at the protein level rather than the RNA level and was not due to post transcriptional gene silencing. Transcriptomic data revealed that expressing P10 in plants significantly suppressed the expression of rice defense‐related genes, which might play important roles in resistance to RSV infection. After infection with RBSDV, plants were more resistant to subsequent challenge by SRBSDV but more susceptible to RSV. Overall, these results indicate that P10 acts as an important effector in virus interactions.

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