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作 者 ：张素勤;;顾兴芳;张圣平;邹志荣

期 刊 ：园艺学报 2005年 32卷 5期 页码：899-901

关键词：黄瓜；白粉病；抗性；遗传机制；

Keywords:Cucumber, Powdery mildew, Resistance, Inheritance,

摘 要 ：采用多世代联合分析方法, 通过3个抗感杂交组合研究了黄瓜白粉病抗性的遗传规律。结果表明, 3个组合的最适遗传模型皆是两对加性- 显性- 上位性主基因+加性- 显性- 上位性多基因模型
(E2120模型) 。组合Ⅰ的主基因遗传率为64.26% ～95.47% , 两对主基因感病相对抗病为部分显性, 两主基因的加性效应及第二主基因的显性效应较大, 两主基因的加性×显性互作效应也较大。组合Ⅱ和组合Ⅲ两主基因的遗传率分别为95.35%和96.04% , 两主基因的加性效应、显性效应和显性度较为相近。

Abstract:The cucumber powdery mildew resistance was studied with joint analysis of multip le generations. The best fitted model of three resistant suscep tible crosses was two major genes plus polygenes mixed inheritance model ( E2120 model) without excep tion. In cross I, heritabilities ofmajor geneswere 64.26% -95.47%. Formajor genes, susceptibilitywas the dominant partly. The additive effects of the two major genes and the dominant effect of the second major gene were higher. The ep istatic effect of additive ×dominant of two major genes was higher too. The heritabilities ofmajor genes in the crossⅡ and cross Ⅲ were 96.04% and 95.35% , respectively. The additive effect, dominant effect and dominance degree of two major genes were similar in this two crosses.

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