The L7AB line with stable three-gene recessive genetic male sterile, its temporary maintenance line and restoring line are successfully bred from the offspring of the allotypic plant (♀) with recessive genetic male sterile X 2822B (♂) with double-low recessive genetic male sterile after tested cross, self-cross, identification and selection of restoring line.

In order to resolving the problem that cross breeding in utilizing hybrid vigor by usingthe material of Multiple Allele inheritance green stalk cabbage as the source of the multiplealleles of male sterility, the experiment was designed to be the compound transfer anddirectional transfer scheme in studying on the method of Genetic male sterility(GMS) lines ofmilk Chinese cabbage.