It is generally believed that infidelity of RNA virus replication combined with R -gene-driven selection is one of the major evolutionary forces in overcoming host resistance. In this study, we utilized an avirulent soybean mosaic virus (SMV) mutant to examine the possibility of emergence of mutant viruses capable of overcoming R -gene-mediated resistance during serial passages. Interestingly, we found that the emerged progeny virus induced severe rugosity and local necrotic lesions in Jinpumkong-2 ( Rsv1 + Rsv3 ) plants, while SMV-G7H provoked a lethal systemic hypersensitive response. Genome sequence analysis of the emerged progeny virus revealed that the mutation in CI that had caused SMV-G7H to lose its virulence was restored to the original sequence, and a single amino acid was newly introduced into HC-Pro, which means that the symptom alteration was due to this single amino acid mutation in HC-Pro. Our results suggest that SMV HC-Pro functions as a symptom determinant in the SMV-soybean pathosystem.
Archives of Virology – Springer Journals
Published: Jan 1, 2011
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