甘蓝型油菜细胞质雄性不育性的基因分析

A Genetic Analysis on the Fertility of CytoplasmicMale Sterility in Brassica napus L.

通过对３８４Ａ、２１７Ａ两个甘蓝型双低油菜细胞质不育系及其保持系、恢复系、杂种Ｆ１、Ｆ２及ａＢＣ１（不育系×杂种Ｆ１）、ｂＢＣ１（杂种Ｆ１×保持系）等群体中植株的育性观察和分析，初步查明３８４Ａ、２１７Ａ均属孢子体不育。雄性不育性是由细胞质中的不育基因和细胞核中的隐性基因相互作用的结果。３８４Ａ具有一对隐性不育核基因，２１７Ａ具有两对隐性不育核基因，且３８４Ａ的一对隐性核不育基因与２１７Ａ的任何一对隐性不育核基因不存在等位关系。３８４Ａ的基因型为Ｓ（ｒ１ｒ１），２１７Ａ的基因型为Ｓ（ｒ２ｒ２ｒ３ｒ３）。

In the study the characters of the A,B and C lines,and hybrids F1,F2,aBC1,(male sterile line×hybrid F1),bBC1 (hybrid F1 × maintainer line)of the two doublelow cytoplasmic male sterile line in Brassica napus L.were observed and analysed.It has been found that the male sterility of 384A and 217A belongs to the sporophytic sterile type,and their male sterility is derived from the interaction of a cytoplasmic sterile gene with recessive nucleus genes.It has also been found that 384A has a pair of recessive nucleus genes,and 217A has two pairs of recessive nucleus genes.There were no equipotent genes between the two CMS lines.The genotypes of the two CMS lines are S(r1r1)for the 384A male sterile line,S(r2r2r3r3) for the 217A male sterile line.