黄瓜果糖含量的主基因-多基因遗传分析

Genetic analysis of fructose content with mixed model of major gene plus polygene in cucumber

以黄瓜自交系EP326(P1)、KP2(P2)及其配制的F1、BC1、BC2、F2共6个世代为材料,运用主基因-多基因混合遗传模型研究露地和大棚栽培环境下黄瓜果实果糖含量遗传效应的差异。结果表明:黄瓜果实果糖含量的遗传符合1对加性-显性主基因+加性-显性多基因遗传模型;主基因的加性效应大于显性效应,而多基因的显性效应大于加性效应;在2种栽培环境下,BC1、BC2、F2的主基因和多基因的遗传率均存在差异;环境方差占表型方差的比率较高,表明环境变异对黄瓜果实果糖含量遗传效应的影响较大,生产上可通过改善栽培环境提高黄瓜果糖含量、改良果实品质。

Genetic effects of the fructose content in cucumber were analyzed by using mixed model of major gene plus polygene. Six generations （P1 , P2. F1 , BC1 , BC2 and F2 ） derived from the cross of EP326 × KP2 were evaluated under two environments including open field and plastic tunnel. The results showed that the fructose content of cucumber was controlled by one additive-dominance major genes plus additive-dominant polygene. The additive effect of major gene was higher than the dominance effect; however, the dominance effect of polygene was higher than the additive effect. The her itability of major gene and polygene were different under two growing environments. The ratio of the environmental vari ance to phenotype variance was high, indicating that the environment might play an important role in shaping the genetic behavior of fructose content of cucumber. Therefore, we should pay more attention to improve the cultivation methods for getting the cucumber with high fructose contents.