Ten PVY isolates representative of four PVY groups (Y N , Y NTN , Y N -W, Y O ), differing by their ability to induce reactions of vein necrosis on tobacco and tuber necrosis on potato, were studied in order to research the regions of the viral genome involved in these necrosis phenomena. The whole genome of these isolates was amplified in two fragments (4 063 and 5 670 nucleotides) and was subjected to a restriction fragment length polymorphism (RFLP) study. In the first 4 063 nucleotides of the PVY genome, a phenetic analysis of RFLP data resulted in a clustering of our PVY isolates into three groups: PVY N isolates (group A); PVY NTN and PVY N -W isolates (group B) and PVY O isolates (group C). In the last 5 670 nucleotides, two groups were found: PVY N and PVY NTN isolates (group D) and PVY O and PVY N -W isolates (group E). From this clustering and the necrosing properties known for theseisolates, the tobacco necrosis determinants seem more likely located inthe 5′ than in the 3′ half part of the viral RNA, whereas it would be theopposite situation for the determinants of the necrosis on potato tubers.Moreover a recombination event seemed to have occurred in the genome ofthe PVY N -W isolates.
Archives of Virology – Springer Journals
Published: Nov 1, 1998
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