The 1,035 nucleotides at the 3'end of the I strain of pea mosaic potyvirus (PMV-I) genomic RNA, encoding the coat protein, have been cloned and sequenced. A comparison of the derived coat protein sequence with those of the bean yellow mosaic virus (BYMV) strains, CS, S, D and GDD, indicates that PMV-I is a strain of BYMV. Sequence comparisons and hybridisation studies using the 3'-noncoding region support this classification. The nucleotide and protein sequence data also suggest that PMV-I and BYMV-CS form one subset of BYMV strains while the other three strains form another.
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