[The differences of the effects of Vrd1 and Ppd-D1 gene alleles on winterhardiness, frost resistance, and yield in winter wheat].

The influence of allelic differences of Vrd1 and Ppd-D1 genes on winterhardiness, frost resistance, yield and its components was studied in recombinant-inbred F5 lines of Odesskaya 16/Bezostaya 1. From 9 to 15% differences in the resistance of recombinant-inbred lines were determined by alternative alleles of Vrd1 gene and 10-16% of Ppd-D1 gene. Interaction of vrd1 and Ppd-D1a alleles led to the higher winterhardiness and frost resistance of tillered plants during the winter.

[The effects of gene Rht8 alleles in agronomic traits of winter bread wheat in the conditions of South Steppe of the Ukraine].

Resistance to frost, winterhardiness, yield and its components were investigated in recombinant-inbred lines F5 Odesskaya 16/Bezostaya 1 and 61 winter wheat varieties differing on the alleles of Rht8 gene. The absence of influence of gene Rht8 different alleles on the tested traits was shown. The high frequency of distribution of alleles Rht8c in modern wheat varieties developed in Plant Breeding and Genetics Institute is a result of high frequency of use of this allele in genetic pool after 1959.

[Chromosomal location of genes for vernalization duration (Vrd) in winter bread wheat].

In this study, we carried out monosomic analysis of two isogenic lines of cultivar Mironovskaya 808, monogenically dominant for genes Vrd1 and Vrd2 reducing the cultivar vernalization requirement duration from 50 to respectively 35 and 45 days, as well as analysis of substitution lines Cappelle Desperez/Bezostaya 1. Gene Vrdl is localized on chromosome 4A; Vrd2, on chromosome 5D. The third gene, which is not allelic to the former two, is present in cultivar Cappelle Desperez on either the IA, 6A, or 4B chromosome.