A comparison of the nucleotide sequence homologies between isolates of the Andean and ordinary strains of potato virus S and their relationship to other carlaviruses.

Sequence homologies between the RNAs of five isolates of the ordinary strain of potato virus S (PVSo), four isolates of the Andean strain (PVSA), potato virus M(PVM), and the type member of the carlavirus group, carnation latent virus (CLV), were compared using cDNA solution hybridization. A high degree of homology (90-100%) was detected between the majority of PVSo and PVSA isolates, but lower levels of homology (less than 10%) were observed between PVS, PVM, and CLV.