关键词: 辐射诱变, 水稻[49EJ], 突变率, 选择效果, 辐射育种

Abstract: In this paper the authors have reported the research method to improve effects in rice radiation breeding. Through the long study of radiation induced mutation of rice it was found that the increase of planting quantity of γ₁ generation is very significant to raise mutation freguencies of rice. In the breeding by irradiation and combined cross the γ₁ generation is used as maternal material, which can not only increase variation frequencies of rice but aloss save both of the time and the labour in it. In order to reduce the period of breeding the mutation plant can be selected form γ₁ generation in accordance with fructification rate high. The fructifiation rate is found by the relativity of percentage of weiht, and according to the fructification rate of γ₁ generation the seeds are kept. The mutation freguency of ueeful characters and selected effect can be raised by using the manipulation technique.

Key words: RADIATION-INDLCED VARIATION, PADDY, MLTATION FREQUENCY, SELECTION EFFECT, RADIATION BREEDING