Elucidation of the virus propagation-interference mechanism in plant cells and search for suppressing factors of this process

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We have shown previously that the propagation of TMV was not observed in rice protoplasts, when TMV-RNA was solely introduced into them. However, TMV propagation was observed, when both TMV-RNA and CMV-RNA were introduced into rice protoplasts. This observation may be interpreted from the viewpoints of microRNA functioning. Generally speaking, it is said that upon virus infection, RNA silencing functions; however, in some of virus products, factors that suppress RNA silencing function upon virus infection. Thus, in this study one of such factors is supposed to be a gene product of 2b of CMV. It is inferred that certain factors in rice cells have been identified that interact with the 2b protein.