Evidence for the multiplicity of alleles at Vrn1, the winter–spring habit locus in common wheat

Abstract
Changes in the number of days to 1st emergence of the spike head with increasing duration of vernalization were examined in the common wheats ''Rescue,'' ''Winalta,'' ''Kharkov 22 MC,'' and the disomic substitution lines of ''Winalta'' and ''Kharkov 22 MC'' possessing the 5A chromosome from ''Rescue.'' Three Vrn1 alleles in addition to the Vrn1 allele which occurs in ''Cadet'' are postulated.

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