【摘 要】
：
用3种不同剂量60Co-γ射线辐射处理2个玉米自交系种子,对其诱变后代M1生物学效应及其M3株系主要性状的变异进行了分析.结果表明:①2个玉米自交系M1植株均受到明显的抑制及辐
【机 构】
：
四川农业大学农学院,四川省农科院作物研究所,松潘县农业局
论文部分内容阅读
用3种不同剂量60Co-γ射线辐射处理2个玉米自交系种子,对其诱变后代M1生物学效应及其M3株系主要性状的变异进行了分析.结果表明:①2个玉米自交系M1植株均受到明显的抑制及辐射损伤,具体表现在,株高和穗位高降低,叶面积减小,并且这种抑制损伤效应随着辐射剂量的增加而增大；它们的M1雄穗长和雄穗分技数均降低；低剂量处理就能引起RO8的穗长和48-2的穗行数在M1代产生较大变化.②诱变后代M3株系各性状出现不同程度的正向突变和负向突变,其中株高、穗位高及叶面积平均值与对照有显著差异的M3株系频率高于主要雄穗及果穗性状,说明这些性状的诱变效果更好；诱变后代各性状的变异幅度和变异系数增大,表明辐射诱变能扩大玉米主要性状的变异谱,拓宽选择范围.此外,在48-2的M3代还获得了2个籽粒颜色发生突变的株系和2个雄性不育突变株系.
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