Study on breeding for a genic male sterile line of round-leaf Flowering Chinese cabbage (Brassica campestris L. ssp. chinensis var. utilis Tsen et Lee).

【Objective】 The study was done in order to solve the problems in the transfer and utilization of genic male sterile line in Flowering Chinese cabbage.【Method】 A multiple allele inherited genic male sterile line of willow-leaf Flowering Chinese cabbage,GMS201,was used as source of male sterility,and a round-leaf Flowering Chinese cabbage,Qi 2,was used as target strain.Backcross was applied to transfer the male sterile gene based on genotype identification though test-crossing.【Result】 A round-leaf genic male sterile line,GMS202 with 100% of male sterile plants and 100% of male sterility,which was similar to Qi 2 in horticultural characteristics,was obtained.The new male sterile line has normal seed production ability without the defects of banded albinism in the flower bud.Two excellent hybrids were developed by the new male sterile.【Conclusion】 The male sterility and other horticultural characteristics in Flowering Chinese cabbage could be transferred simultaneously based on the method designed in the research.