The study of alleles of avenin-coding loci in the selection material of oats

The research objective was studying allelic structure of the avenin-coding loci of a new oats cultivar Varnensky and the selection lines allocated from it differing in the length of vegetative period. The material for the study were original seeds of the Varnensky oat variety, as well as 21 late maturing and 30 early maturing lines isolated from it. The analysis of the Varnensky variety showed that it consisted of two biotypes with the frequency of occurrence of 98 % and 2 %. Genetic formula for avenin in this cultivar was Avn A2 + ned Bned + 4 C2 + ned. Three blocks of avenin components were found that were missing in the catalog of the genetic nomenclature: the block controlled by the Avn B locus for the first biotype and Avn A, Avn C loci for the second biotype. It was found that all late-ripening lines were homogeneous and, in terms of the component composition of avenin, were identical to the main biotype of the Varnensky variety. Genetic formula of avenin of late maturing lines was: Avn A2 Bned C2. In the study of early maturing breeding lines, 4 types of spectra were identified. At the research of early selection lines 4 types of ranges were revealed. The spectrum of selection line № 8 corresponded to the first biotype of the Varnensky variety - A2 Bned C2, the spectra of 23 lines were identical to the second biotype of the variety - Aned B4 Cned. The lines with genetic formulas of avenin Aned2 B4 C2 (№ 4, 18, 19), A2 B4 C2 (№ 15, 25 and 28) and heterogeneous lines № 10 and 29 (Avn Aned+2 B4+ned Cned+2) and № 16 (Avn Aned+2 B4 Cned+2) were also identified. The studied breeding lines were formed as a result of splitting of residual heterozygotes selected from hybrid combinations when creating the Varnensky variety. The lines were combined in blocks according to genetic formulas of avenin and left for further study and inclusion in the breeding process.