Description of VRN1 and VRN2 mutants.

1Vernalization accelerates flowering in the vernalization sensitive genotypes but has no effect in the vernalization insensitive ones.2The Kronos line used for mutagenesis carries a vernalization insensitive VRN-A1 allele with a large deletion in the first intron and a vernalization responsive VRN-B1 allele (wild type). The presence of the vernalization insensitive VRN-A1 allele results in a spring growth habit independently of the allele present at the VRN-B1 locus [7].