Molecular markers as tools in breeding for resistance to Potato Virus Y

Potato virus Y (PVY) is an economically important pathogen of potato as a vegetatively propagated crop. High resistance to all strains PVY determined by Ry-genes, which are introgressed into modern varieties from limited number sources ‒ Solanum stoloniferum Schlechtd. et Bche . , andigenum Juz. Buk., chacoense Bitt. Use new species and interspecific hybrids based on them provides for the expansion existing gene pool in breeding PVY. Traditional viruses has still great potential, though, it long laborious process. Molecular markers linked Ry-genes widely integrated order increase effectiveness practical breeding. Previous studies have revealed shortcomings using molecular Ry-genes. To assess predictive abilities RYSC3, M45, M6 Ryadg YES3-3A Rysto PVY, F1 generation two populations was studied, creation inter-specific were used. The nature segregation 5:3 obtained phenotype showed that original parental forms can be not only previously identified, but also unidentified Ny-genes hypersensitivity. Correlation coefficient between presence 0.64 YES3-3 marker (79 % matching) 0.54 М45, М6 (76 matching). There been cases “false positive” results study (the susceptible genotypes), indicate insufficient observed consistent with chromatid segregation, confirming simplex inheritance resistant parents. ratio genotypes presence/absence 0.86:1.