用~(60)Co-γ射线不同剂量处理小麦干种子,在M_1代幼苗离乳期调查叶龄、苗高等14个性状,结果根长对辐射反应最敏感,与个体水平的辐射敏感性反应也恰恰接近,可作为评度小麦辐射敏感性的第一指标性状。在测定根长有困难时,可考虑第一叶片长作为第二指标性状。离乳期M_1代幼苗对辐射相对敏感的性状均与剂量呈极显著负相关,处理平均数转换成对照的百分数后与剂量的回归系数b值及D_(50)①值可比较性状或品种间的辐射敏感性差异。 Different doses of ~ (60) Co-γ ray were used to treat the dry seeds of wheat, and 14 traits of leaf age and seedling height were investigated in the offspring of M_1 seedlings. The results showed that the root length was the most sensitive to radiation, and the individual level of radiation-sensitive response Also just close, can be used as the first index to evaluate the radiation sensitivity of wheat traits. In the determination of root length difficulties, consider the first leaf length as the second index traits. The relative sensitivity to radiation of offspring M_1 seedlings was significantly and negatively correlated with the dose. The percentages of the average value after conversion to the control were compared with the values ​​of the regression coefficient b and D_ (50) Differences in radiosensitivity.