| 摘要: |
| 【目的】探讨黄瓜幼苗耐盐性的遗传机制。【方法】以黄瓜耐盐自交系M8（P1）和不耐盐自交系M7（P2）为亲本，构建P1、P2、F1、B1、B2及F2 6个世代群体材料，采用数量性状主基因+多基因模型分析法，分析以150 mmol/L NaCl溶液处理后，黄瓜幼苗耐盐性的遗传规律。【结果】分离群体B1、B2和F2的盐害级别分布均呈现偏态分布，表明黄瓜幼苗的耐盐性属于数量性状遗传，有主基因的存在；黄瓜幼苗期耐盐性遗传受1对加性 显性主基因+加性-显性-上位性多基因控制，其中主基因遗传率在B1、B2和F2群体中分别为42.409 2%，28.917 1%和63.245 6%，多基因遗传率分别为17.673 6%，36.505 0%和0；环境方差占表型方差的比例分别为39.917 2%，34.577 9%和36.754 4%，环境因素对黄瓜幼苗耐盐性遗传的影响较大。【结论】黄瓜幼苗期耐盐性受多基因和环境因素的影响较大，不宜进行早代耐盐品种的选择。 |
| 关键词: 黄瓜 耐盐性 盐害级别 遗传分析 |
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| 基金项目:辽宁省“十一五”重大科技攻关项目（2006215001） |
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| Genetic analysis of salt-tolerance of cucumber at seedling stage |
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| Abstract: |
| 【Objective】The research discussed the genetic mechanism of salt-tolerance of cucumber at seedling stage.【Method】The salt tolerance inheritance of the seeding cucumber treated with 150 mmol/L NaCl solution was analyzed by applying the joint segregation analysis of a mixed genetic model of major gene plus polygene in six generations (P1,P2,F1,B1,B2 and F2) from the cross between highly tolerable inbred line M8(P1)and not tolerable inbred line M7(P2).【Result】The salt injury grades of segregating population B1,B2 and F2 presented skew distribution showing that salt-tolerance of cucumber at seedling stage belonged to quantitative genetic character,and there existed major gene.The inheritance of salt-tolerance was fitted by one major genes plus polygenes mixed model (D model),in B1,B2 and F2 populations,the estimated heritability of major genes was 42.409 2%,28.917 1%,63.245 6%, respectively.The heritability of poly genes was 17.673 6%,36.505 0% and 0,respectively.The proportion of environmental variance in phenotypic variance was 39.917 2%,34.577 9% and 36.754 4%.The environmental factors had strong effect on salt-tolerance of cucumber.【Conclusion】The salt-tolerance of cucumber at seeding stage was controlled by one major gene plus poly-genes,affected by environment easily and not fit to earlier choice. |
| Key words: cucumber salt-tolerance salinity tolerance rating genetic analysis |
