In order to study the distribution of dwarfing genes Rht-B1b and Rht-D1b in wheat and their effects on plant height,we detected the distribution of Rht-B1b and Rht-D1b genes in 321 wheat varieties from three populations(white-grain wheat cultivars in China winter wheat areas,historical wheat cultivars and natural spring wheat population), and analyzed the effect of dwarfing genes Rht-B1b and Rht-D1b on plant height of spring wheat breeding materials.The results showed that among 321 materials,193 materials contained Rht-B1b gene with the frequency of 60.1%, and among them there are 29,77 and 87 materials contained Rht-B1b gene in white-grain wheat cultivars from China winter wheat areas,historical wheat cultivars and spring wheat breeding materials,with the frequency of 34.5%,72.6% and 66.4%, respectively; 135 materials contained Rht-D1b gene with the frequency of 42.1%, and among them there are 41, 21 and 73 materials contained Rht-D1b gene in white-grain wheat cultivars from China winter wheat areas,historical wheat cultivars and spring wheat breeding materials, with the frequency of 48.8%, 19.8% and 55.7%,respectively. In addition, 78 of the 321 materials contained both Rht-B1b and Rht-D1b genes with the frequency of 24.3%, and among them there are 15, 17 and 46 materials contained Rht-B1b and Rht-D1b genotype in white-grain wheat cultivars from China winter wheat areas,historical wheat cultivars and spring wheat breeding materials, with the frequency of 17.6%, 15.9% and 35.1%, respectively. Further analysis found that materials with both Rht-B1b and Rht-D1b genes have lower plant heights among the 91 materials with plant height data. |