关键词: 甘蓝型油菜, 高含油量, 中油杂8号, 杂交种选育

Abstract: High oil yield resulted from the combination of high grain yield and high oil content is a prerequisite for the development of high efficient oilseed rape production. Using irradiation induced mutation，sexual hybridization combined with paired test cross, the fertility, yield and oil content of the three lines of cytoplasmic male sterility were improved and a new hybrid variety Zhongyouza No.8 with high oil yield was developed. The yield of Zhongyouza No.8 was significantly higher than that of the control variety Zhongyou 821 with 9.82% and 10.64% increase in Hubei provincial and nationwide trials, respectively. The oil content and oil yield of Zhongyouza No.8 was the highest among all the lines in Hubei provincial trials, being 42.77% and 1 051.05 kg·ha-1 with 3% and 161.25 kg·ha-1 increase compared to the control Zhongyou 821, respectively. The genetic basis for the strong heterosis, factors contributing to the yield and oil content increase of Zhongyouza No.8 as well as the strategy for high oil yielding variety improvement through the increase of seed size are discussed in this paper.

Key words: Brassica napus, high oil yielding, Zhongyouza No.8, hybrid breeding