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A new approach for the simultaneous differentiation of biological and geographical strains of Potato virus Y by uniplex and multiplex RT-PCR.
Journal of Virological Methods 2002 June
Two strains of Potato virus Y (PVY), the common (PVY(O)) and the tobacco veinal necrosis (PVY(N)) have been known for decades. More recently, a tuber ringspot necrosis (PVY(NTN)), and several recombinants of PVY(O) and PVY(N) (designated here as PVY(N:O)) have been described. Further, the PVY(N) group of strains have been assigned to two geographical subgroups of European (EU) PVY(N/NTN) and the North American (NA) PVY(N/NTN). The evolution of new PVY(N) strains, has complicated the diagnosis, which requires a combination of bioassay, serological and molecular assays. To simplify the identification and differentiation of various PVY(N) strain groups, a competitive (single antisense and multiple sense primers) reverse transcription-polymerase chain reaction (RT-PCR) was used, making use of minor differences in the variable region part of the PVY genome. Specifically, primers based on small variations in nucleotide stretches of P1 gene permitted a broad range separation of PVY(O) and PVY(N) groups and the specific detection of strain subgroups. The primer pairs designed for identifying PVY(O), EU-PVY(N/NTN), NA-PVY(N) and NA-PVY(NTN) are described. Primer pairs can be used in a uniplex (single pair of primer) or multiplex (duplex, tetraplex or pentaplex) competitive RT-PCR, allowing simultaneous testing for any combination of PVY(O), EU-PVY(N/NTN), NA-PVY(N) and NA-PVY(NTN).
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