| 摘要: |
| 【目的】了解胡麻粗脂肪含量的遗传方式。【方法】以用DYM×STS构建的包含233个家系的重组自交系群体(F6∶7)和2个亲本为材料，在甘肃定西、宁夏固原和河北张家口3个环境下种植，采用索氏抽提仪测定粗脂肪含量，运用数量性状主基因+多基因混合遗传模型分析方法，进行胡麻粗脂肪含量的遗传模型分析。【结果】甘肃定西、宁夏固原和河北张家口3个环境条件下家系间胡麻粗脂肪含量均存在广泛变异，表现超亲遗传现象，近似正态分布；粗脂肪含量的遗传模型均为4MG-AI，表现为4对具有加性上位性效应的主基因遗传模型，不存在多基因效应。主基因遗传率分别为92.80%，99.02%和80.71%，环境引起的变异分别为7.20%，0.98%和19.29%。【结论】胡麻粗脂肪含量受主基因控制，且存在加性上位性效应。在胡麻高油育种中，提高粗脂肪含量不仅要注重主基因的利用，也要考虑基因间的互作效应。 |
| 关键词: 胡麻 粗脂肪 主基因+多基因遗传分析 |
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| 基金项目:国家自然科学基金项目“油用亚麻遗传图谱构建及亚麻酸含量的QTL定位研究”（31160291），“胡麻抗盐相关性状选择及QTL定位研究”（31560347） |
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| Major gene plus polygene inheritance analysis of crude fat content in oil flax (Linum usitatissimum L.) |
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HUA Qingchun,ZHAO Li,WANG Limin,et al
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| Abstract: |
| 【Objective】This study aimed to reveal the genetic mechanism of oil flax crude fat content.【Method】A total of 233 recombinant inbred lines (RILs) derived from DYM×STS (F6∶7) along with their P1 and P2 were planted in three environments including Dingxi Gansu,Guyuan Ningxia,and Zhangjiakou Hebei.Crude fat contents were analyzed with Soxhlet Auto analyzer and mixed major gene plus polygene inheritance model was used to analyze P1,P2 and RILs.【Result】The crude fat contents appeared wide variation and transgressive inheritance,and the frequency distribution fitted normal distribution.The genetic model of crude fat content was 4MG-AI in three different environments.The crude fat content was controlled by 4 major genes with additive epistatic effect but without polygenic effect.The main gene heritability values of E1,E2,and E3 were 92.80%,99.02%,and 80.71%,while their environmental effects were 7.20%,0.98% and 19.29%,respectively.【Conclusion】The oil flax crude fat content was controlled by major gene with additive epistatic effect.Attention should be paid to the use of main genes and consideration of interaction among genes for breeding oil flax with high oil content. |
| Key words: oil flax crude fat major gene plus polygene mixed inheritance |
