The coat protein(CP)gene of potato virus Y(Chinese isolate)was transferred into tobaccothrough the mediation of Agrobaacterium tumefaciens LBA4404.The transformed plants wereanalysed by PCR followed by DNA hybridization,Northern and Western blot.The transgenicplants were challenged with PVY-C inoculation.One of the six transgenic lines displayed highresistance at the inoculum dose of up to 200μg/ml of PVY-C. To our knowledge,it is thehighest virus concentration used, compared with other published results.Th...