The present invention relates to a method for producing a plant which is transformed with a recombinant plant RNAi expression vector containing HC-Pro (helper component-proteinase) gene derived from soybean mosaic virus and which is enhanced in resistance to viral diseases by soybean mosaic virus And seeds thereof, and a method for promoting plant tolerance to viral diseases caused by soybean mosaic virus, which comprises transforming said vector into a plant and inducing gene silencing of HC-Pro gene will be.
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