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一、二系配套选育的遗传学基础目前我国选育的油菜雄性不育材料多数是属于核质遗传型,其特点是育和不育主要受一对基因控制,育是显性(AA)、不育是隐性(aa)。这一类型有以下三种基因型和两种表现型:1.同质不育(以 aa 表示):一对育性基因均为隐性不育,表现型亦为不育,自交不能正常结实,(封底图1中 a—Ⅰ、a—Ⅱ)。2.同质可育(以 AA 表示):一对育性基因均为显性,表现型亦为可育,自交可以正常结实(封底图1
At present, most of the male sterile material of rapeseed breeding in China belongs to the nuclear cytogenetic type, which is characterized by that fertility and infertility are mainly controlled by a pair of genes, and fertility is dominant (AA) , Infertility is recessive (aa). This genotype has the following three genotypes and two phenotypes: 1. Homologous infertility (expressed as aa): one pair of fertile genes are recessive, the phenotype is also sterile, and selfing can not be normal Strong, (back cover Figure 1 a-Ⅰ, a-Ⅱ). 2. Homogenous fertile (AA): a pair of fertility genes are dominant phenotypic also fertile, self-fertility can be normal (back cover Figure 1