Cytology and Genetics 2007, v 41, number 5, 18-26

In monogenic dominant for Vrd1 or Vrd2 genes almost isogenic lines and cultivars the shortening of the period before hadding duration, plant height reduction, and decrease of frost resistance particularly in the second half of winter and in spring have been shown. As for the determined traits the greater effect was detected for Vrd1 gene, the less one – for Vrd2. Genes Vrd1 and Vrd2 did not significantly influence the quantitative characteristics of yield components except the 1000 kernel weight. The use of monogenic dominant for Vrd2 genotypes is recommended to develop new dwarf cultivars for south step of Ukraine.