Abstract
A simple and reliable procedure for reverse transcription-polymerase chain reaction (RT-PCR) detection and strain differentiation of Potato virus Y (PVY) was developed. Three primers were designed within the coat protein (CP) and nuclear inclusion protein b (NIb) region, exploiting a single base polymorphism identified as being present in all the recombinant PVY NTN isolates published. Samples infected with PVY produce a single band of 569 bp, while isolates belonging to PVY NTN strain give an additional band of 334 bp. The technique was tested on a collection of well-characterised isolates of PVY from a range of strains and was found to detect all of the isolates reported as belonging to the PVY NTN strain. All of the isolates detected possess a recombination event within the coat protein. Further sequence analysis revealed that all the recombinant PVY NTN isolates reported thus far would be detected using this assay, whilst isolates thought to be PVY NTN that do not possess the coat protein recombination event would not be detected.
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