Study of genic male sterile temporary maintainer line in the 'Youqing si jiu'flowering Chinese cabbage through back crossing

The goal was to resolve the problem of the combination irregularity of genic male sterility in flowering Chinese cabbage.Using the same recurrent parent,we studied genic male sterile AB line type Ⅰand temporary maintainer line in flowering Chinese cabbage through back crossing.Based on the Multiple Allele Hypothesis of genic male sterility,we studied the transfer of genic male sterile temporary maintainer line in flowering Chinese cabbage by crossing,test crossing and so on.The genetic male sterile lines transferred from AB fa 45 of heat-resistant Chinese cabbage was used as a source of male sterility and 'youqing si jiu'flowering Chinese cabbage as the recurrent parent.We obtained a new genic male sterile temporary maintainer line through six backcrossings possessing economic characters similar to its recurrent parent.Genic male sterile lines which originated from the new genic male sterile temporary maintainer line with 100% of male sterile plants and 100% of male sterility were obtained.Our method is suitable for transferring male sterile lines in subspecies having different economic characters.According to the transfer method we should obtain the seed resources which are similar to their recurrent parent in economic characters.