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Infectivity of recombinant strawberry vein banding virus DNA

Department of Plant Pathology, University of California Davis, Davis, CA 95616, USA

Correspondence
Ali Mahmoudpour
ali5491338{at}yahoo.com

Infectivity of the cloned DNA genome of strawberry vein banding virus (SVBV) was demonstrated by particle bombardment of 4-week-old strawberry (Fragaria vesca L. var. UC-5) plants with gold particles coated with the putative full-length 7·9 kb viral DNA. Vein banding symptoms developed on 15 % of inoculated plants 6–7 weeks post-inoculation. An approximate 1·25-mer of the viral DNA was cloned into the binary vector pCGN1547. Particle bombardment of this construct into strawberry plants gave an infection rate of 75 %. The construct was used for transformation of Agrobacterium tumefaciens, and infiltration of these cells into healthy strawberry leaves resulted in development of vein banding symptoms in 100 % of inoculated plants. Gel electrophoresis, Southern blot hybridization with an SVBV probe and sequence analyses of PCR-amplified DNA fragments were used to confirm SVBV infection in symptomatic plants.

Present address: Department of Plant Protection, University of Tabriz, Tabriz 51664, Iran.