Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 3/31/2002
Publication Date: 7/1/2002
Technical Abstract: Plum pox potyvirus (PPV), economically the most important stone fruit virus in the world, was identified in Adams County, PA in 1999. Surveys continue in the surrounding areas for detection and eradication of trees infected with PPV. The survey uses a PPV monoclonal antibody ELISA-DASI assay, which is time consuming and somewhat unreliable in detecting low titer viral infections. A real-time fluorescent RT-PCR assay was developed to detect and quantify PPV in tissue samples using multiple platforms (i.e. Smart Cycler, TaqMan, etc.). The target sequence was selected in a conserved region of the coat protein. Detection limits (750 fg of target RNA) and standard curves were determined using in vitro transcripts that included the target sequence. The assay successfully identified European and Pennsylvania strains of PPV in leaf tissue samples from plum, peach, pea, N. clevelandii and N. benthamiana. Ongoing work includes adapting the assay to index different Prunus tissues (i.e. roots, stems, bark, buds and flowers).