It has long been assumed that cowpea golden mosaic disease (CGMD) in southern Asia is caused by a begomovirus distinct from those causing disease in other legumes. The components of a begomovirus causing CGMD in western India were isolated, cloned and sequenced. Analysis of the sequences shows the virus to be an isolate of Mungbean yellow mosaic India virus , but with a distinct DNA B component with greater similarity to components of a second legume-infecting begomovirus occurring in the region, Mungbean yellow mosaic virus . The clones of the virus were readily infectious to cowpea, mungbean, blackgram and French bean by agroinoculation. However, the wild-type isolate was shown to be easily transmissible by whiteflies between cowpea plants but not to blackgram and mugbean, suggesting that the insect vector plays a major role in determining the natural host range of these viruses.
Archives of Virology – Springer Journals
Published: Jul 1, 2008
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