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沈 镝, 方智远, 李锡香, 李全辉, 程嘉琪, 宋江萍, 王海平, 邱 杨
以1份西双版纳黄瓜和2份普通黄瓜自交系为试验材料配制2个杂交组合,并构建4世代群体(P1、P2、F1、F2)。分别采用目测分级、色差仪测定a值和b值以及HPLC方法测定β-胡萝卜素含量等4个指标,研究黄瓜果肉色性状的遗传规律。结果表明:2个杂交组合F2群体的果肉色相关指标呈单峰偏态或双峰分布,表现为主基因+多基因的数量遗传特征。多世代联合分析表明,黄瓜果肉色性状遗传基本符合两对主基因+多基因模型。两组合8个果肉色相关指标最优模型的F2群体主基因遗传率较高,为76.0% ~ 99.3%,多基因遗传率较低,为0 ~ 23.7%。对黄瓜橙黄果肉色的选择应在分离早期世代进行。
关键词:  西双版纳黄瓜  果肉色  β-胡萝卜素  色差仪  遗传
基金项目:国家科技支撑计划(2006BAD13B06-3-4); 国家自然科学基金项目(31071797);农业部园艺作物遗传改良重点开放实验室项目
Inheritance of Fruit Flesh Color in Cucumis sativus L.
Two hybrid combinations and 4 generations (P1、P2、F1、F2) were made with one xishuangbanna cucumber (Cucumis sativus L. var. xishuangbannanesis Qi et Yuan) and two common cucumber(Cucumis sativus L. var. sativus)inbred lines. Four indexes including color grade classification, a value and b value determined by color different meter, β-carotene content measured by HPLC were determined respectively to study the inheritance of cucumber flesh color traits with joint analysis method of multiple generations. The results showed that the F2 population of the two combinations appeared one asymmetry peak or two peaks distribution, indicating that the trait was quantitative in nature and controlled by major gene plus polygene. The heritance of fruit flesh color of cucumber fitted the pattern of two major genes plus polygene. For F2 generation, the major gene heritability was high(76.0%-99.3%)and that of polygenes(0-23.7%)was low,which suggested that artificial selection to orange flesh of cucumber could be carried out in the separation of the early generations.
Key words:  Cucumis sativus L. var. xishuangbannanesis Qi et Yuan  Flesh color  Color different meter  β-carotenoid  Inheritance