Analysis on Combining Ability of Yield and Quality Characters of 13 Foundation Parents of Brassica napus

Abstract

【Objective】The study was carried out to improve the selection efficiency of dominant combinations of yield and quality characters in Brassica napus, and to provide a basis for the utilization of heterosis of rape resources in Tibet.【Method】13 inbred lines of B. napus were used as parents and 40 hybrid combinations were combined according to incomplete diallel cross design. With 3 quality traits and yield per plant as research objects the combining ability and heritability of each parent were analyzed.【Result】The general combining ability 5 male parents ranked as: Xiwang 759 > Xiangyou 420 = Jinghua 165 > Yumiao 10 > Dadi 95, while that of 8 female parents ranked as: 04306-2 > 127025-3 =158106-2 = 158112-3 > 08014-2 > 68-3 = Nianhe 18 > 06034-3. The combination with the best special combining ability for yield per plant was Jinghua 165×Nianhe 18(28.8798). The combinations of Jinghua 165×Nianhe 18 and Xiangyou 420×158112-3 had the potential of high yield and high quality. And the combinations of Yumiao 10×68-3, Yumiao 10×127025-3, Xiangyou 420×06034-3, with SCA values of 28.8316, 25.3975 and 22.4819 respectively, had yield advantage. The broad heritability of oleic acid content was the highest, up to 96.93%; while yield per plant was the lowest, only 56.09%.【Conclusion】The two foundation parents Xiwang 759 and 04306-2 with the optimal general combination ability could be mainly used in the selection of hybrid combinations of B. napus. In the process of breeding, the three quality traits of oil content, protein content and oleic acid could be selected early, while the trait of yield per plant was not suitable for early selection.

Keywords

• tibet
• brassica napus l.
• foundation parents
• yield per plant
• quality
• combining ability