Abstract
The Ry adg allele is widely used by breeders to confer extreme resistance to all strains of PVY. However, the necrotic strain has increased recombination resulting in recent considerable losses in productivity. Thus far, not all necrotic recombinant strains of PVY have been tested for their reaction to the Ry gene. The objective of this study was to identify potato clones carrying the resistant allele and to assess their reaction to the following recombinant strains: NTN (PVY NTN), Wilga (PVY N-Wi), and "curly top" (PVY E). Advanced clones from the potato breeding program at Universidade Federal de Lavras were evaluated through a specific molecular marker for the Ry adg allele. The clones carrying the resistance allele were grafted on tobacco plants infected with necrotic recombinant strains of PVY. The clones carrying the allele for resistance to PVY were not infected with any of the recombinants during the grafting test. These results confirm that resistance to necrotic recombinant strains has not yet been overcome and that the Ry adg allele also confers resistance to the three recombinant strains tested.
Highlights
The Potato virus Y (PVY) is the most economically important virus in potato crops causing a series of symptoms that vary considerably due to the wide genetic variability that occurs within potato species
Serologic testing was performed for the four viruses, this study considered only the reaction of clones to PVY
Even clones that showed a positive reaction to PVY underwent molecular testing for the Ryadg allele to avoid false positives, which can occur in such tests
Summary
The Potato virus Y (PVY) is the most economically important virus in potato crops causing a series of symptoms that vary considerably due to the wide genetic variability that occurs within potato species. Several PVYNTN isolates have been described as recombinant PVYN and PVYO because they present three or four recombination junctions (RJs) in different regions of the genome (Glais; Tribodet; Kerlan, 2002; Nie; Singh; Singh, 2004; Lorenzen et al, 2006a; Kerlan et al, 2006; Schubert; Fomitcheva; Sztangret-Wisniewska 2007; Singh et al, 2008). This recombinant is described in several potato fields around the world, including Brazil, Ciênc. Agrotec., Lavras, v.38, n.4, p.343-351, jul./ago., 2014
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