西葫芦果长性状主基因-多基因混合遗传分析

目的]为西葫芦果长育种提供依据。方法]选用蔓生和矮生的西葫芦自交系配制q-1×23-4G（组合1）和q-1×A-7（组合2）2个组合,构建P1、F1、P2、B1、B2和F2 6个家系世代群体,应用植物数量性状主基因-多基因混合遗传模型对该6个世代群体果长进行多世代联合分析。结果]2个组合的西葫芦的果长遗传为1对加性主基因＋加性-显性多基因（D-2）遗传模型,组合1以加性效应为主,而组合2以显性效应为主;2个组合F2的基因遗传率较高,环境影响相对较小。结论]西葫芦果长育种宜早代选择。

Analysis of Fruit Length Using Mixed Major Gene and Polygene Inheritance Model in Summer Squash

Objective] The aim was to provide scientific basis for breeding on the fruit length of summer squash.Method] Inheritance of the fruit length of summer squash in P1,P2,F1,B1,B2 and F2 from two crosses q-1×23-4G(cross 1) and q-1×A-7(cross 2) was investigated by the mixed major gene and polygene inheritance model of quantitative traits.Result] The results showed that the fruit length was controlled by D-2 model;Genetic effect of fruit length of cross 1 was mainly additive effect,but genetic effect of fruit length of cross 2 was mainly dominant effect.Heritability values of the genes of F2 were relatively high and the environmental effect was relatively low.Conclusion] The fruit length breeding of summer squash should be selected in early generation selection.