An isolate of potato virus Y, named PVY-36, reacted with polyclonal antibody against PVY-0 (an ordinary strain), but not with any of eight monoclonal antibodies (MAbs) specific to PVY-0 or with two MAbs specific to PVY-T (a necrotic strain). From its host range and symptomatology, PVY-36 belongs to the PVY° group. The nucleotide sequence of the coat protein (CP) coding region of the PVY-36 genome was determined and the amino acid sequence was predicted. Based on the CP amino acid sequence, PVY-36 is more closely related to PVY-0 than to PVY-T. There were eight amino acid differences between the CPs of PVY-36 and PVY-0 in the N-terminal 30 amino acids. It is suggested that amino acids 8-15 and/or 26-30 from the N-terminus may determine a PVY-O-specific epitope (or epitopes).
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