55 cultivar genotypes were identified on the genetic system Vrd, controlling winter wheat vernalization duration differences. The frequency of the genotypes Vrd1Vrd1vrd2vrd2 scored 50,9 % (28 samples). The differences between the frequencies of the genotypes vrd1vrd1Vrd2Vrd2 (9 samples, 16,4 %), Vrd1Vrd1Vrd2Vrd2 (10 samples, 18,2 %) and vrd1vrd1vrd2vrd2 (6 samples, 10,9 %) were not significant.
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