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Simple sequence repeats (SSR) polymorphism of 34 microsatellite loci (LG1, 8 and 13) was studied in lines carrying the downy mildew resistance genes  Pl  and lines with no  Pl . The microsatellite loci ORS328 and ORS781 were selected as markers for genes  Pl6  and  Pl8  in lines HA 335 and QHP-1, respectively. Markers were identified for gene  Pl ARG   in RHA 419 and some accessions of  H. argophyllus . The SSR markers ORS509, ORS605, ORS610, ORS1182 and ORS1039 were proven to reliably identify the parental line carrying  Pl ARG   gene, control and select the heterozygous F 1  hybrids and identify homozygous genotypes in F 2  generations. Obtained results indicate the necessity of validation of the markers in various germplasm pools and breeding collections. The SSR markers that are tightly linked to  Pl 6 , Pl 8 , Pl ARG   would be useful in the sunflower breeding.  Pl ARG   homozygous F 2  segregants, developed and identified with marker assisted selection in this study, are recommended for further breeding as a new source of genetically determined resistance to downy mildew.

Validation of Microsatellite Markers of Pl Resistance Genes to Downy Mildew of Sunflower