Abstract:Wheat grain morphology and plant height are important target traits in wheat breeding history and they are significantly correlation with wheat yield performance. In this study, the wheat dwarf sphaerococcoid grain mutant W98 identified from Yanzhan1 EMS (ethylmethyl sulfide) mutant library was analyzed. The results showed that the plant height of the mutant W98 was 24 cm, whereas the wild type YZ1 was 73 cm. W98 reduced plant height by decreasing the length between internodes, not reducing of the number of nodes. Correlation analysis showed that the two traits – dwarf and sphaerococcoid grain were significantly correlated. Genetic analysis indicated that the sphaerococcoid grain phenotype was controlled by a single incompletely dominant gene by using 1544 F2:3 progenies generated from the cross of the long grain Mexico synthetic hexaploid wheat 10th12 with the mutant W98. Sensitivity test of GA and BR indicated that both of the wild type and the mutant were not sensitive to GA, while the mutant was sensitive to BR and the wild type was not by using the wheat leaf unrolling assay with different BR concentrations.