Abstract:
Male sterility and seeding ability of the cytoplasmic male sterility line of leafy mustard (0912A) (
Brassica juncea) were evaluated by fertility and floral characters. With 0912A and its maintainer line (0912B) as maternal parents and five typical inbred lines as male pa-rents,ten F
1 hybrids were produced to study the effects of male sterile cytoplasm and heterosis.The results showed that the sterility of 0912A was steadily complete,the fertility and sterile plant rate were 100%,and the seed-set was normal.The heterosis of yield-related traits was obvious, but not for the quality traits.Male cytoplasm had a distinct negative effect on weight per plant,but the heterosis of
hau cytoplasmic F
1 was still significant.The male cytoplasmic effect on hybrid traits varied with different nuclear genetic background,and the negative effect of cytoplasm could be reduced or eliminated by choosing suitable male parents.