Analysis on Combining Ability and Heritability of the Main Agronomic Characters for JA CMS in Brassica napus L

In this paper, fifteen combinations crossed by five JA cytoplasmic male sterile lines (Ai, A2, A3, A4 and A5) and three restoring lines (R1, R2 and R3) were selected to analyze the combining ability and heritability of nine main agronomic characters of Brassica napus L. to definite the application potential of these parent materials. The result showed that the general combining ability (GCA) of male parents was R3>R2>R1 and that of female parents was A4>A1>A2>A5>A3. The special combining ability (SCA) of A2x% in plant height, number of branches, number of pods per plant and yield per plant was the best. The yield per plant of A2xR3, A1xR1 and A2xR1 ranked the first three places in the 15 combinations. The broad heritability of yield per plant was the highest, and that of the height of branches was the lowest. In conclusion, the comprehensive characters of R3, A2 and A4 were better, which could be used to create new materials. Good offspring were more likely to be chosen from the combination with higher parental GCA.