雌雄同株黄瓜单性结实性遗传分析

Inheritance of Parthenocarpy in Monoecious Cucumber

【目的】分析雌雄同株黄瓜单性结实性的主基因+多基因混合遗传特点,为选育强单性结实雌雄同株黄瓜品种提供理论依据。【方法】通过强单性结实雌雄同株黄瓜自交系‘6457’与非单性结实自交系‘6429’和‘6426’构建的6个世代群体,应用植物数量性状主基因+多基因联合分离分析方法,分析不同遗传背景和季节雌雄同株黄瓜单性结实性遗传表现。【结果】雌雄同株黄瓜单性结实性遗传受2对主基因+多基因控制(E-1-0,E-1-2)。两主基因的加性效应值均较大,B1、B2、F2主基因遗传率分别为72.2%—88.8%、52.5%—93.1%、88.6%—95.4%,相应的多基因遗传率分别为0—11.2%、0—43.1%、0—1.5%。【结论】强单性结实性雌雄同株黄瓜品种选育以双亲均为强单性结实为宜,常规杂交育种早期世代选择有效。

[Objective] The mixed major gene plus polygenes inheritance of parthenocarpy in monoecious cucumber were studied to provide a theoretical basis for breeding monoecious cucumber varieties of strong parthenocarpy. [Method] Using the model of the major gene plus polygene of quantitative traits, a joint analysis of six-generations from crossing a highly parthenocarpic monoecious lines ＇6457＇ with two non-parthenocarpic inbred lines ＇6429＇ and ＇6426＇ was carried out to investigate the inheritance of the parthenocarpy in cucumber in different backgrounds and seasons. [Result] The results showed that inheritance of parthenocarpy was controlled by two major genes and polygenes. The additive effects of the two major genes were great. The major gene heritabilities of B1, B2, and F2 were 72.2%-88.8%, 52.5%-93.1%, and 88.6%-95.4%, respectively. While the corresponding polygene heritabilities were 0-11.2%, 0-43.1%, and 0-1.5%, respectively. [ Conclusion ] The breeding of monoecious cucumber with highly parthenocarpy should choose parents that both are highly parthenocarpy. Selection of parthenocarpy can be carded out in the earlier generations of conventional crossing breeding.