Molecular mechamisms of specific interactions in bromovirus infections in rice

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Specific interactions are observed in systemic infection of rice varieties with Brome mosaic virus (BMV) strains. We have identified rice and BMV factors that are involved in such interactions. Genetic analysis suggested that resistance responses of japonica rice varieties to BMV were controlled by a single dominant locus (600 kb region). Mutational analyses suggested that differences in systemic infection of rice with BMV strains were determined at the level of intercellular movement by several missense mutations within the C-terminal non-conserved region of BMV polymerase protein 2a.