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Characterization of Potyviruses from Tulip and Lily which Cause Flower-Breaking

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

Five viruses causing colour-breaking of tulip flowers were isolated from tulips and lilies. Tulip-breaking virus (TBV), tulip top-breaking virus (TTBV), tulip band-breaking virus, Rembrandt tulip-breaking virus and lily mottle virus were all characterized as potyviruses by serology and potyvirus-specific PCR. Sequence analysis of amplified DNA fragments spanning a conserved area of the coat protein cistron of potyviruses was performed in order to classify the isolates as distinct viruses or strains. It appears that all tulip-breaking viruses are distinct viruses and TTBV was found to be strain-related to turnip mosaic virus.

Received 29 July 1992; accepted 5 January 1993.