Selection of valuable potato genotypes with introduced resistance genes derived from wild species | Selekcia cenných genotypov ľuľka zemiakového s introdukovanými génmi rezistencie z divorastúcich druhov
2009
Heldák, J., Potato Research and Breeding Inst., Veľká Lomnica (Slovak Republic) | Brutovská, E., Potato Research and Breeding Inst., Veľká Lomnica (Slovak Republic) | Galliková, A., Potato Research and Breeding Inst., Veľká Lomnica (Slovak Republic)
Introduction of wild species into cultivated potato genotypes allowed obtaining new sources of resistance providing long-term effect against viruses and they are useful in breeding of new varieties. Wild species, Solanum acaule, Solanum tuberosum subsp. andigena and Solanum vernei, were used to breed varieties and clones with extreme resistance to potato virus X (PVX). There were selected 90 genotypes from the gene bank and 166 genotypes from crossings of 4 resistant genotypes in simplex form (Rxrxrxrx) and 1 susceptible variety Svella (rxrxrxrx) for marker selection. Two molecular markers detected extreme resistance to PVX in two Polish, four German, one Hungarian, three Dutch, twelve Slovak genotypes maintained in the gene bank and sixty three resistant genotypes from four crossings of resistant and susceptible genotypes. The allele specific marker 221R is a reliable tool for marker assisted selection. The results indicate that the Rx gene for extreme resistance to PVX could be derived from one genetic source which was the ancestor of Solanum tuberosum subsp. andigena, Solanum acaule and Solanum vernei or presence of three genes with the same markers could be a consequence of the fact that the primary source could be any of the mentioned wild species as well.
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