以复等位基因遗传的抗根肿病大白菜甲型雄性不育两用系CRAB742为不育源和抗源,采用杂交、回交、测交和自交方法,向大白菜自交系B1转育抗根肿病基因和核雄性不育基因;并对不同回交世代数的植株进行植物学性状调查,确定最佳的回交代数。试验结果证明,在同类型的大白菜间,采用严格的经济性状选择和抗性、育性筛选,回交3代可以满足目标经济性状的要求。 The multiple allele-resistant Chinese cabbage strain CAAB742 with resistance to clubroot disease was used as male sterile line and anti-source line. The results of crossing, backcross, cross test and inbred lines showed that Chinese cabbage inbred line B1 The genes of resistance to clubroot disease and nuclear male sterility were transferred. The plants of different backcross generations were investigated for botanical characters and the best backcross generation number was determined. The test results show that in the same type of Chinese cabbage, using strict economic traits selection and resistance, fertility screening, backcrossing 3 generations to meet the requirements of the target economic traits.