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Identification of potyviruses using the polymerase chain reaction with degenerate primers

¹ Department of Biochemistry, Leiden University, Gorlaeus Laboratories, Einsteinweg 5, 2333 CC Leiden
and² Bulb Research Centre, Vennestraat 22, P.O. Box 85, 2160 AB Lisse, The Netherlands

Local areas of conserved amino acid sequence in the replicase and coat proteins of potyviruses were used to select nucleotide sequences for use in the construction of sets of degenerate oligonucleotide primers for amplification of DNA fragments on potyvirus-specific templates in a combined assay of reverse transcription and the polymerase chain reaction (RT-PCR). Sequences selected for the construction of degenerate primers included the coat protein gene sequence of tulip breaking virus from lily, which is reported in this paper. It is shown that the degenerate primers support potyvirus-specific amplification, but do not support amplification on carlavirus and potexvirus templates. A panel consisting of definite and prospective members of the potyvirus group occurring in bulbous crops was subjected to the degenerate primer RT-PCR assay; amplified fragments were used in cross-hybridization experiments and restriction fragment length polymorphism analysis to detect relationships among these potyviruses. A partially characterized virus isolated from Gloriosa rothschildiana was positively identified as a potyvirus by specific amplification and subsequent sequence analysis of an amplified DNA fragment.

Received 29 January 1991; accepted 20 March 1991.

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