We determined the complete nucleotide sequence of a potyvirus purified from a Japanese yam plant. The genomic RNA of this virus is 9 757 nucleotides (nts) in length, excluding the 3′-terminal poly(A) tail. It contains a single open reading frame (ORF) encoding a polyprotein of 3130 amino acids (aa) with a calculated Mr of 356,793. The genomic organization of this potyvirus is similar to that of other members of the genus Potyvirus and nine potential cleavage sites for the viral proteinase were found by comparison of its sequence with those available for other potyviruses. The nucleotide sequence and genome characteristics show that this isolate is a new potyvirus species. Its polyprotein differs substantially from Yam mosaic virus (YMV) (50% amino acid sequence identity) and fourteen other potyvirus species examined (44–59% identity). Although this potyvirus has been classified as YMV, our results suggest that the potyvirus infectious to the Japanese yam plant in Japan is distinct from YMV. Therefore, we propose that the Japanese yam potyvirus should be designated as Japanese yam mosaic virus (JYMV).
Archives of Virology – Springer Journals
Published: Feb 1, 1999
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