Molecular-genetic investigation of F1 and F2 sunflower hybrids that were received for the purpose of introgression of PlARG gene was carried out. Microsatellite loci ORS610 and ORS1039 that are flanking PlARG at genetic distances of 2,1 and 0,3 cM were used. It was shown the possibility of identification of hybrid plants from population obtained from crossing PlARG donor line RHA 419 with inbred lines OC 1019B and OC 1029B. Some F2 plants with genotypes that appropriate to parent line RHA 419 were selected. They could be used in the breeding programs for creation new inbred lines with durable resistance to downy mildew.
Keywords: Helianthus annuus, Plasmopara halstedii, DNA markers, PlARG, resistance, downy mildew
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