Abstract
The presence of the Rf1 gene (pollen fertility restorer of CMS PET1) in genotypes of most restorer lines is confirmed by molecular and hybridological analysis methods. Molecular markers of the Rf1 locus are identified for the first time in genotypes of autofertile lines of the collection of the Vavilov All-Russian Research Institute of Plant Industry (VIR) as well as in genomes of perennial and annual wild species of the genus Helianthus. The possibility of introgression of the fertility restorer gene into the genome of the cultivated sunflower during distant hybridization is shown.
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