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Yam mild mosaic virus (YMMV) is prevalent in yams (Dioscorea spp.) worldwide. To gain an insight into the genetic diversity and molecular evolution of YMMV, 89 isolates from West Africa, Asia, South Pacific, and America were analyzed phylogenetically by using sequence between the 3′-terminal of the coding region of the coat protein and the 5′-terminal of non-coding region at the 3′ end of the YMMV genome. The results revealed that there was a significant genetic diversity among isolates and a clear correlation between the coat protein gene sequence and the geographical origin of YMMV isolates. Of particular, YMMV isolates from North China and South China fell into two different groups. Furthermore, full genome comparison identified four chimeric genome patterns and six putative recombination signals representing four recombination events were detected among 12 genomes of independent isolates from China and Brazil, suggesting a high frequency of genome recombination event.

Genetic diversity and genome recombination in Yam mild mosaic virus isolates