摘要： 探讨筛选组合（Ma7×W15）维生素C（Vc）含量的遗传机制。以相对低维生素c含量的自交系Ma7（P1）和相对高维生素C含量的自交系W15（P2）为亲本，构建6个世代群体材料，利用植物数量性状主基因＋多基因混合遗传模型多世代联合分析方法分析华南型黄瓜中维生素C含量的遗传机制。结果表明，维生素C含量的最适遗传模型为一对加性主基因＋加性-显性多基因混合遗传模型。在分离世代中主基因遗传率在B1、B2、和F2群体中分别为47．47％，36．34％，52．59％；多基因的遗传率分别为18．47％，0，21．63％；环境方差占表型方差的范围为25．78％～63．66％，环境对维生素C含量的遗传有较大的影响，说明在黄瓜维生素C含量的遗传体系中，微效多基因具有重要作用，这一性状适于高代选择。

关键词: 黄瓜, 维生素C, 主基因-多基因, 遗传

Abstract: The research discussed the genetic mechanism of vitamin C （Vc） content in combination test Ma7 × W15. The materials were inbred lines（ Ma7,W15 ）,in which Ma7 （P1）was relatively low levels of vitamin C line and W15 （P2） relatively high vitamin C content line,by applying the joint segregation analysis of a mixed genetic model of major gene plus poiy-gene in six generations to study the genetic mechanism of vitamin C content. The results of analysis suggested that the optimum model of vitamin C was a pair of additive major genes plus additive-dominant pol- ygenes mixed inheritance model,in B1, B2and F2populations,the estimated heritability of major genes was 47.47%, 36.34%,52.59%, respectively. The heritability of poly-genes was 18.47%, 0 and 21.63%, respectively. The range of environmental variance in phenotypic variance was 25.78% - 63.66%, the environment factors had a greater role in genetic of vitamin C of cucumber. Results demonstrated that polygenes had played an important role in determining the vitamin C content in curcumber,and it would be more efficient to conduct selection in hight gen- eration for the trait.

Key words: Cucumber（ Cucumis sativus L. ）, Vitamin C Major gene plus polygenes Heredity

中图分类号: 

• S642.03