Transformation and Utilization of Cytoplasmic-Nuclear Male Sterility in Heading Chinese Cabbage

In order to ensure the purity of hybrid seeds and improve the efficiency of seed production of heading Chinese cabbage,the cytoplasmic-nuclear male sterile line CMA was adopted to hybridize a range of inbred lines with different colors(orange red,yellow or white) of inner head leaves,various heading types(leaf-tip closed folded,leaf overlapped,cylindrical) and adaptation to different growing seasons(spring,summer and autumn).After multi-generation backcrosses and selection,a number of stable cytoplasmic-nuclear male sterile lines which could met the market demands were successfully obtained.The test of seed production indicated the F1 progenies with high uniformity reached 100% of hybrid rate and the seed yield was equivalent to that of normal self-incompatible inbred lines.