【摘要】 利用⁶⁰Co γ射线0～36.1 C/kg照射量(照射量率为2.84×10^-2c/（kg·min）)辐照含水量为12.1％的苜蓿干种子,其活力指数、根长、幼苗存活率、苗高、株高和青草产量随照射量的增大而降低;花粉不育率、微核细胞率、POD活性和自由基相对含量则随照射量的增大而升高。活力指数、根长的剂量效应曲线符合多靶单击模型,幼苗存活率、苗高、株高和青草产量的剂量效应曲线可用直线回归方程拟合。苜蓿种和品种间的辐射敏感性存在极显著的差异（P<0.01）。应用模糊聚类分析法可将25个苜蓿材料分为极敏感型、敏感型、中间型、迟钝型和极迟钝型五类。苜蓿种和品种的适宜辐射剂量为12.9～34.8mC/kg。不同品种之间相差2～3倍。更多还原

【Abstract】 The dried alfalfa seeds (12. 1% moisture) were exposed to 60Co 7 radiation field with 0~36. 1 C/kg radiation doses (irradiation rate is 2. 84×10-2C/(kg .min)) to observe and measure some radio-bio-effectivities. In the range of irradiation doses, vitality index, root length, seedling survival rate, seedling height, plant height and grass yield decreased and pollen sterility, micro-nucleus rate, free radical relative content increased as the amount of radiation increased. The activity of peroxidase increased as the amount of radiation increased within certain range of dose and tended to decreased beyong that range. Vitality index and root length, which dosage effect curve is compatible with multiple targets-single hit model, and seedling survival rate, seedling height, plant height and grass yield, which dosage effect curve is compatible with linear regression model. There were strong co-relations between the seedling height, micro-nucleus cell rate and the free radical ralative content (P <0. 01). There were very significant difference (P<0.01) between the alfalfa species and varieties. With fuzzy concentration analysis method, the alfalfa sample were classified into five groups: Higher sensitive, Sensitive, Intermediate, Resistant, Higher resistant. The suitable irradiation doses for the alfalfa species and varieties are between 12. 9~34.8 mC/kg.更多还原