Heading time of substitution and near-isogenic lines of common wheat with dominant alleles Vrn-B1a and Vrn-B1c

Abstract

Heading time of substitution and near isogenic lines (NILs) with Vrn B1a and Vrn B1c alleles was studied without vernalization and after 30 day vernalization in the greenhouse and in the field. Without vernalization, both in the greenhouse and in the field, plants with Vrn B1c allele headed several days earlier, than plants with Vrn B1a. However, plants with Vrn B1a allele responded to vernalization by more pro nounced heading acceleration than Vrn B1c plants. The weak Vrn B1a allele dominated in F 1 hybrids from the cross between two NILs with Vrn B1c and Vrn B1a alleles. These observations confirm the multiple allel ism of the Vrn B1 gene, responsible for the spring growth habit in wheat.