Add time:08/06/2019 Source:sciencedirect.com
The genus Ipomovirus is one of six currently recognized genera in the family Potyviridae. The complete nucleotide sequence of Squash vein yellowing virus (SqVYV), a putative ipomovirus recently described in Florida, has been determined. The 9836 nt SqVYV genomic RNA [excluding the poly(A) tail] has one large open reading frame encoding a single polyprotein of 3172 amino acids, typical of the genome organization for most members in the family Potyviridae. The 10 mature proteins predicted to be derived from the SqVYV polyprotein include P1a and P1b but no HC-Pro, similar to Cucumber vein yellowing virus (CVYV) but different from Sweet potato mild mottle virus (SPMMV), both recognized members of the genus Ipomovirus. Phylogenetic analysis of these proteins supports classification of SqVYV as a novel species within the genus Ipomovirus. However, the similar genome organization strategy of SqVYV and CVYV, which differs from that of SPMMV, indicates that the taxonomy of the genus Ipomovirus needs to be re-examined and a new genus created within the family Potyviridae to accommodate the observed discrepancies in ipomovirus genome organization.
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