Twenty potato virus Y (PVY) isolates were characterized. They represented two strains only, PVY(O) (three isolates) and PVY(N) (17 isolates). However, application of serological and molecular genetic methods led to a more complicated characterization. For example, five isolates induced necrotic symptoms on tobacco plants typical of PVY(N), despite reacting as PVY(O) serologically. Moreover, the PVY isolates were not identical according to molecular genetic properties. Typical PVY(NTN) PCR products were observed for 14 isolates, but five of them (Hr 220-5, Hr 387-7, Nord 242, Syn1Scot, and 41-97) did not produce potato tuber necrotic symptoms in infected cultivars. An immunocapture reverse transcription-polymerase chain reaction (RT-PCR) probing was developed using a set of 24 primer pairs derived from eight regions of the PVY genome. Using this method, five out of seven PVY(NTN) isolates including the Czech standard PVY(NTN) from the potato cv. Nicola were found to be identical. However, two PVY(NTN) isolates and all the other probed PVY samples showed unique patterns, suggesting specific differences at the nucleotide level. This method enabled specific identification of individual isolates variability even within different PVY strains.
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