摘要： 应用主基因+多基因混合遗传模型并结合经典遗传学方法对甘蓝型黄籽油菜No.2127-17与黑籽油菜99Yu42和恢5148-2杂交组合的6个世代(P1,F1,P2,B1,B2和F2)群体的种子种皮颜色进行联合分析。经典遗传学表明,种皮颜色受部分显性核基因控制,并具有母体遗传特点。混合遗传分析表明,受一对加性-显性主基因+加性-显性多基因(D-1)控制,主基因对种皮颜色的表现起主要作用。其中,组合No.2127-17/99Yu42中主基因的加性和显性效应分别为7.58和2.48,而多基因则分别为1.91和1.33。在B1,B2和F2群体中种皮颜色主基因遗传率分别为35.34%,63.27%和60.76%,多基因遗传率分别为2.80%,7.12%和13.29%。环境对其遗传表现影响较大,方差占总方差的29.95%,~61.86%。

关键词: 甘蓝型黄籽油菜, 种皮颜色, 遗传, 主基因+多基因混合遗传

Abstract: Inheritance of seedcoat colour in the cross No.2127-17(yellow-seeded Brassica napus L.)/99Yu42(black-seeded) or Hui 5148-2 was studied by applying the major gene plus polygene model along with classic genetics analysis through a joint analysis of its P1,F1,P2,B1,B2 and F2 generations.The classic genetics analysis demonstrated that seedcoat colour was under the control of the maternal genotype and partially dominant nuclear gene.The joint analysis results showed that seedcoat colour was controlled by one major gene with additive dominance effects plus polygenes with additive dominance effects(Model D-1),the additive dominance effects of the major gene play a major role in the performance of seedcoat colour.The additive effects and the dominance effects were 7.58 and 2.48 in the major gene and 1.91 and 1.33 in the polygenes respectively.Heritability of seedcoat colour in B1,B2 and F2 was estimated to be 35.34%,63.27% and 60.76% for the major gene and 2.80%,7.12% and 13.29%for the polygenes.And the enviorments markedly affected the seedcoat colour expression for its 29.95%-61.86% variance ratio.

Key words: Yellow, 一seeded Brassica ncrpus L, Seedcoat colour, Inheritance, Majorgene plus polygene mixed inheri-tance

中图分类号: 

• S643.3