关键词: 玉米, 辐射遗传学, 突变, 遗传

Abstract: A series of experiments were conducted to investivate the biological effect, mutation and genetical law of the corn single hybird and local variety whose dry seeds were irradiated by ⁶⁰Co-γ ray. The reoult showed that the single hybrid was more sensitive to ⁶⁰Co-γ ray irtion than the localvariety. Compared with check (unirradiated material), the M₂ of Single hybrid had a larger coefficient of variation for every character, but the M₂ of localvariety had a larger coefficient of variation only for some characters. For both kinds of materials, the mutant frequency of every character of M₂ was higher than that of check. The ve direction of mutation was more prominent for plant height and the positive one was more prominent for ear length and ear row. As to the character's beritability from M₂ to M₃, all materials got a imilar trend, i. e. p least height, ear height and ear row had a higheat heritability followedby ear leaf width, ear length, sten diameter, ear leaf length and tassel branch.

Key words: CORN, RADIATION GENETICS, MUTATION, HERITABILITY