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- W2037495289 abstract "Emergence of viral genotypes can make control strategies based on resistance genes ineffective. A few years after the deployment of tobacco genotypes carrying alleles of the Potato virus Y (PVY) recessive resistance gene va, virulent PVY isolates have been reported, suggesting the low durability of va. To have a broader view of the evolutionary processes involved in PVY adaptation to va, we studied mutational pathways leading to the emergence of PVY resistance-breaking populations. The viral genome-linked protein (VPg) has been described to be potentially involved in va adaptation. Analyses of the VPg sequence of PVY isolates sampled from susceptible and resistant tobacco allowed us to identify mutations in the central part of the VPg. Analysis of the virulence of wild-type isolates with known VPg sequences and of mutated versions of PVY infectious clones allowed us to (i) validate VPg as the PVY virulence factor corresponding to va, (ii) highlight the fact that virulence gain in PVY occurs rapidly and preferentially by substitution at position AA 105 in the VPg, and (iii) show that the 101G substitution in the VPg of a PVY C isolate is responsible for cross-virulence toward two resistance sources. Moreover, it appears that the evolutionary pathway of PVY adaptation to va depends on both virus and host genetic backgrounds." @default.
- W2037495289 created "2016-06-24" @default.
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- W2037495289 date "2014-11-01" @default.
- W2037495289 modified "2023-10-04" @default.
- W2037495289 title "Evolutionary Pathways to Break Down the Resistance of Allelic Versions of the PVY Resistance Gene va" @default.
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- W2037495289 doi "https://doi.org/10.1094/pdis-11-13-1126-re" @default.
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