Abstract
A previously undescribed monopartite begomovirus was identified from Malvastrum coromandelianum plants exhibiting yellow vein symptoms characteristic of begomoviruses, in Kampot province, Cambodia. The apparently full-length viral component was cloned and sequenced following enrichment of circular DNA by rolling circle amplification and restriction enzyme digestion. The genome of the virus was 2,737 nucleotides in length (KP188831), and exhibited an organization like that of other monopartite begomoviruses, sharing the highest nt identities of 87.7% with Ageratum yellow vein virus (AM940137). A satellite molecule was amplified from total DNA by PCR amplification with the betasatellite-specific primer pair β01/β02. The satellite molecule (1,346 nt, KP188832) had a structure characteristic like other betasatellites associated with begomoviruses, and shared the highest nt identity of 84.8% with Malvastrum yellow vein betasatellite (MN205547). According to the criteria established for species demarcation for classification of begomoviruses ( Geminiviridae ) and betasatellites ( Tolecusatellitidae ), respectively, the virus isolate from M. coromandelianum in Cambodia is a previously undescribed novel monopartite begomovirus species，for which the name Malvastrum yellow vein Cambodia virus (MaYVCV) is proposed, whereas, the betasatellite is identified as an previously undescribed novel betasatellite species, for which the name Malvastrum yellow vein Cambodia batesatellite (MaYVKHB) is proposed.
SnapShot: Posttranscriptional Gene Silencing
