Abstract
Detection of potato virus Y (PVY) in dormant potato tubers using the enzyme-linked immunosorbent assay (ELISA) has been reported not to be accurate and reliable and it requires breaking of the dormancy of tubers prior to testing. We describe a simple, practical and highly sensitive hybridization method based on the use of biotinylated DNA probes for detecting PVY and potato aucuba mosaic virus (PAMV) in dilutions made of crude extracts of infected potato leaves and dormant tubers. As little as 50 fg of RNA can be detected by this method, and the probes are highly specific for their targets, even in crude plant extracts. The presence of one virus did not interfere with the detection of the other.
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