籼型温敏核不育水稻叶绿素突变体的诱变及其初步研究

用＾６０Ｃｏγ射线辐照籼型温敏核不育系２１７７Ｓ,获得了一批常见的叶绿素突变体。Ｍ２代按苗计,叶绿素总突变频率为０．２６２％,其中只有４．５０％可以存活并遗传,从中筛选出３３个综合性优良的灿型温敏核不育叶绿素突变系。经鉴定,这些叶绿素突变受基因控制,比较稳定,有的只在苗期表达并逐渐转为正常,有的则在全生育期表达。

A PRELIMINARY STUDY ON INDUCTION AND IDENTIFICATION OF CHLOROPHYLL MUTANTS OF Indica TYPE TEMPERATURE SENSITIVE GENIC MALE-STERILE RICE

Chlorophyll mutants of different type were obtained from indica type temperature sensi-tive genic male·sterile rice(cv. 2177S )by using“Co γ-rays irradiation. The total chloro-phyll mutation frequency reached to 0.26%in M2 generation. However only about 4. 50%of these mutants could survived.Among them,33 heritable chlorophyll mutant lines wereeasily distinguished,and were screened and studied.The mutants either showed chlorosis oryellowing or expressed only at seedling period or persisted all growth cycle. The expressionof mutant character was stable under different environment.It is suggested that they are use-ful as the marker traits in two-line hybrid rice.Moreover,the agreconomical traits of most ofthese lines changed in different levels compared with the parent line 2177S.Every mutationline seemed to be controlled by one recessive gene as the F1 plants of reciprocal crosses be-tween mutant and 2177S showed normal leaf color. And the ratio of green plants/mutantplants was 3:1 in the segregated F2 population.