The effect of natural selection on the allelic frequency of gliadin-coding loci and their associations in an artificially created hybrid population of winter wheat

Hybrid population with heterogeneity for five gliadin-coding loci was created by crossing of five winter common wheat cultivars (Belozerskaya 47, Ilyichevka, Kyyanka, Mironovskaya 808, Polesskaya 70) by the complete scheme. Frequencies of alleles at these loci and their associations were analyzed after two, four and ten years of resowing. The ratio of alleles at the studied loci was changed as reproduction occurred. Gli 1A5 allele displayed stable tendency to frequency increasing, Gli 1D1--a little tendency and Gli 6A3--very essential tendency. The share of Gli 6D2 allele increased only after ten years of population reproduction. Combination of alleles at two, three, and five loci was not accidental. The most common regularity was predominance of the frequency of allelic associations characteristic of the parents (except for Ilyichevka) over new combinations. Possible causes of this phenomenon are discussed.

Keywords: