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Rsv1, a single dominant gene in soybean PI 96983, confers resistance to most strains of Soybean mosaic virus (SMV), including strain G2. The phenotypic response includes the lack of symptoms and virus recovery from mechanically inoculated leaves. To study the resistance mechanism, SMV-N (an isolate of strain G2) was introduced into PI 96983 by grafting. Hypersensitive response (HR)-like lesions occurred on the stems, petioles, and leaf veins, and virus was recovered from these lesions. The response demonstrated the cytological and histological characteristics of HR as well as elevated transcription of a soybean salicylic acid-inducible, pathogenesis-related (PR-1) protein gene. Mechanical inoculation of PI 96983 primary leaves with a high level of SMV-N virions caused no symptoms or up regulation of the PR-1 protein gene transcript. Furthermore, inoculation with infectious viral RNA did not alter the resistance phenotype. The data suggest that interaction of SMV-N with Rsv1 has the potential to induce an HR-like defense reaction. Rsv1-mediated resistance in the inoculated leaf, however, is HR-independent and operates after virion disassembly.

molecular plant-microbe interactions

<i>Rsv1</i>-Mediated Resistance Against <i>Soybean mosaic virus</i>-N Is Hypersensitive Response-Independent at Inoculation Site, but Has the Potential to Initiate a Hypersensitive Response-like Mechanism

Rsv1-Mediated Resistance Against Soybean mosaic virus-N Is Hypersensitive Response-Independent at Inoculation Site, but Has the Potential to Initiate a Hypersensitive Response-like Mechanism