RT-PCR-ELOSA tests on pooled sample units for the detection of virus Y in potato tubers.

A highly sensitive RT-PCR protocol able to detect potato virus Y (PVY) in pooled sample units (tubers) was developed. PVY-specific primers selected in the coat protein gene were found to amplify a 359 bp fragment from diluted crude extract of infected tubers. For the detection of the amplification products, a colorimetric detection procedure in microtiter plates was established. The amplicons are hybridized between a covalently linked capture probe and a specific biotinylated detection probe ELOSA tests. This detection method detects at least 50 pg of virus per reaction for the four cultivars tested. The RT-PCR-ELOSA assay was adapted to pooled units in order to increase the sample size while reducing the number of tests.