A strategy for breeding of the yellow-seeded hybrid in Brassica napus L

摘要

Through more than 20 years research on the genetic rule of seed color in Brassica napus L., we found that there were different main effect genes and QTLs controlling the seed color of the yellow-seeded lines (B. napus L.) bred from different genetic sources. The same status consist in black-seeded lines (B. napus L.). The inheritance of the seedcoat color in yellowseeded B. napus L. was mainly controlled by one or two major genes mixed with the effects ofpolygenes (QTLs), the QTLs had important influences on the seedcoat color, the effects of additive and dominance were also very obvious, and which was the main reason that the seedcoat color was different among the plants. A strategy for breeding of the yellow-seeded hybrid in B. napus L. had been put forward in the paper. According to the strategy, the yellow-seeded B. napus L. lines with a complete dominance yellow-seeded main effect gene (their genotype were supposed as Y1Y1sisisjsj) and the black-seeded lines with genotype y1y1sisisjsj would be developed. The hybrids with genotype y1Y1sisisjsj would have 100% yellow seed rate and good yellow- seeded degree, the seed color of the hybrids were almost as same as their yellow- seeded parent. According to the strategy, the yellow-seeded Brassica napus hybrid varieties Yuhuang No.1 and Yuhuang No.2 have been registered in China in 2003 and 2004 respectively.