全雌黄瓜单性结实性的遗传分析

Inheritance of Parthenocarpy in Gynoecious Cucumber

采用植物数量性状主基因+多基因混合遗传模型对黄瓜强单性结实雌性系‘6401’与非单性结实自交系‘6429’、‘6426’杂交组合多世代群体的单性结实性进行联合分析,结果表明:全雌黄瓜单性结实性在不同遗传背景下遗传表现基本一致,单性结实性遗传均表现为不完全隐性基因遗传,符合E-1-1模型,受两对加性—显性—上位性主基因+加性—显性多基因控制。两组合第1主基因显性效应、主基因显性×显性互作效应以及多基因效应较大。‘6401×6429’组合的B1、B2、F2群体(主基因+多基因)遗传率分别为51.36%、72.31%和76.78%;‘6401×6426’组合的B1、B2、F2群体(主基因+多基因)遗传率分别为20.50%、75.39%和74.58%。强单性结实全雌黄瓜品种选育以双亲均为强单性结实为宜。

Using the model of the major gene plus polygene of quantitative traits, a joint analysis of multi-generations from crossing a highly parthenocarpic gynoecious lines ＇6401 ＇ with two non-parthenocarpic inbred lines ＇6429＇ and ＇6426＇ was carried out to investigate the inheritance of the parthenocarpy in cucumber. Results showed that the inheritance of parthenocarpy in gynoecious cucumbers with different genetic backgrounds was fitted into the same genetic model. Inheritance of parthenocarpy is expressed as incompletely recessive, fit the E-1-1 model, and controlled by two additive-dominant-epistatic major genes and additivedominant polygenes. Dominant effect of the first major gene and dominant × dominant interaction between the two major genes as well as polygene effects were higher in those two cross combinations. The heritabilities of B1 , B2, F2 from cross ＇6401 ×6429＇ were 51.36% , 72.31% and 76.78% , respectively, while the heritabilities of B1, B2, F2 from ＇6401 ×6426＇ were 20. 50%, 75.39% and 74.58% respectively. These results indicated that breeding of gynoecious cucumber with highly parthenocarpy should choose parents that both are highly parthenocarpy.