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A method for the routine detection of avocado sunblotch viroid (ASBVd) in nucleic acid extracts of infected avocado tissues by reverse transcription-polymerase chain reaction (RT-PCR) was developed using ASBVd-specific primers. Amplified cDNA products were analyzed by electrophoresis on nondenaturing 6% polyacrylamide slab gels. The size of the major RT-PCR product from ASBVd-infected tissue was estimated to be 250 bp. This product was absent from amplified extracts of uninfected tissue. The amplification product from ASBVd was sequenced by the dideoxynucleotide chain termination method, and the sequence was over 97% identical to the published sequence. The RT-PCR assay is sensitive enough to allow viroid detection without requiring large amounts of tissue, highly purified ASBVd, or molecular hybridization.

Application of RT-PCR for Indexing Avocado Sunblotch Viroid