The genetics of cucumber mosaic cucumovirus (CMV) and the pathogenicity of the virus for Raphanus sativus were analyzed using pseudorecombinants constructed from the infectious transcripts of two naturally occurring strains of cucumber mosaic cucumovirus (CMV-D8 and CMV-Y). CMV-D8, but not CMV-Y, could cause systemic infection of the plant. Viral accumulation and systemic movement in the plants was examined using immuno-tissue blot analysis, dot blot and Northern blot hybridization. Virus was equally distributed and CMV RNAs accumulated to similar levels in the inoculated cotyledons of radish irrespective of the pseudorecombinant, suggesting that there are no apparent differences in the ability of infection and viral accumulation between CMV-D8 and CMV-Y. We found, however, that both RNAs 2 and 3 of CMV-D8 are involved in determining the efficiency for the systemic infection of R. sativus . Co-operated interactions between genetic information of RNAs 2 and 3 would control the efficient translocation of virus from the inoculated leaves to the uninoculated upper leaves of radish plant.
Archives of Virology – Springer Journals
Published: Jun 1, 1998
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