γ射线辐照天然杂种玉米的诱变作用及其在选育种质材料中的应用

MUTATION OF MAIZE NATURAL HYBRID AND GERM PLASM MATERIAL SELECTION BY γ RAY IRRADIATION

用１８６Ｇｙ６０Ｃｏγ射线辐照玉米自交系Ｅ２８天然杂种株上自由授粉的多穗行（２２行）果穗种子，Ｍ１植株性状和穗部性状表现出明显的辐射生理损伤效应，Ｍ２，尤其是Ｍ３呈现出很高的性状变异性。通过对Ｍ３及其以后的３个世代的选择，选到了两个多穗行、抗病、紧凑型且配合力高的优良玉米种质材料。

The seeds of multiple row(22) ears of natural hybrid of maize self bred line E28 were irradiated with 186 Gy of 60 Co γ ray.The radiation physiological damage existed in plants and ears of M 1.The character variation rates of M 2 and M 3,especially M 3,were very high.Two maize germ plasm material with good characters such as multiple rows,disease resistance,compact conformation and high combining ability were obtained.