Genetic Improvement of Wheat Growth Habit and Its Molecular Marker-Assisted Selection in Yellow and Huai River Reaches Distribution of Allelic Variation for Genes of Vernalization and Photoperiod among Wheat Cultivars from 23 Countries Allelic Variation of the Vernalization Genes in Henan New Bread Wheat Cultivars Polymorphism of Wheat TaFT Gene Expressional Sequence and the Impact to Flowering Dates Distribution of allelic variation for genes of vernalization and photoperiod in wheat from Heilongjiang