甘蓝型油菜优质胞质不育系492A、保持系492B的选育

Breeding of CMS line 492A and maintainer 492B in B.napus

农艺性状好的双低甘蓝型油菜品系 2 2 4 -2同时分别与非优质的胞质不育系 D6A和保持系 D6B杂交 ,使遗传基因转育到 D6A、D6B之中。再从 ( D6B× 2 2 4 -2 ) BC1 F2 中选株与 ( D6A× 2 2 4 -2 ) BC1 F2 中分离的不育株测交、回交 ,同时测定父本品质。这样能较快地稳定农艺性状 ,并将不育基因、保持基因和优良品质基因等整合到新不育系、新保持系中。新不育系 4 92 A和新保持系 4 92 B的特征特性多倾向于 2 2 4 -2 ,由 4 92 A配制的杂交组合 950 5在省。

Rapeseed variety 224 2, with ‘Double low’ (erucic acid and glucosinolate are both low) and good agronomic traits, was crossed simultaneously with CMS line D6A and its maintainer D6B, then backcross, to transfer the genetic material of 224 2 into D6A and D6B. The good plants selected from (D6B×224 2) BC 1F 2 were test crossed, and backcrossed with male sterile plants from (D6A×224 2) BC 1F 2, and determined the erucic acid and glucosinolate of paternal plants for 5 generations. This way can stabilize agronomic characters quickly, and get sterile genes, maintain genes and good quality genes together into new CMS line and new maintainer. The characteristics of new CMS line 492A, maintainer 492B are much similar to that of 224 2. Hybridized combination 9505 which came from 492A, has been showing heterosis significantly in provincal and municipal regional test of rape varieties.