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Tobacco necrosis virus (TNV) susceptibility of a cytokinin overproducing tobacco line (CTKm) transformed with a CaMV 35S:ipt gene construct was studied. Expression of the ipt gene was confirmed by RT-PCR. As a result of cytokinin excess caused by the transgene, senescence of CTKm plants was greatly delayed. The number of virus-induced necrotic lesions as well as the coat protein content were significantly...
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