| 摘要: |
| 【目的】探索鲜食型糯玉米种子活力的遗传模型，为糯玉米种子活力研究提供理论基础。【方法】以种子活力有显著差异的糯玉米自交系N34（P1）和N56（P2）为亲本，配制F1、B1、B2、F2群体，利用主基因＋多基因混合遗传模型分析方法，对种子活力3个相关指标（发芽势、电导率和活力指数）的遗传模型进行分析。【结果】鲜食糯玉米发芽势最佳遗传模型为2对加性-显性-上位性主基因＋加性-显性-上位性多基因混合遗传模型，B1、B2和F2主基因遗传率分别为66.62%，49.10%和92.94%；电导率最佳遗传模型为1对加性-显性主基因＋加性-显性多基因混合遗传模型，B1、B2和F2主基因遗传率分别为57.75%，57.96%和65.14%；活力指数最佳遗传模型是2对加性-显性-上位性主基因＋加性 显性多基因混合遗传模型，B1、B2和F2主基因遗传率分别为66.49%，48.02%和89.49%。3个性状均以主基因遗传为主。【结论】在育种实践中，对糯玉米种子活力的遗传改良和选择可在低世代进行，同时可采用聚合回交或轮回选择来积累有效修饰基因和微效基因，以提高育种效率。 |
| 关键词: 糯玉米 种子活力 主基因＋多基因混合遗传模型 主基因遗传 |
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| 基金项目:广东省高校优秀青年人才培养计划项目（2012LYM_0078）；广州市岭南特色作物种质资源研究与利用重点实验室项目(202002010010) |
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| Mixed major genes and polygenes inheritance analyses for seed vigor traits in waxy corn |
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JIANG Feng,YAN Yan,HUANG Zhenggang,et al
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| Abstract: |
| 【Objective】This study explored the genetic model for seed vigor traits of waxy corn to improve related researches.【Method】The waxy corn inbred lines N34(P1) and N56(P2) with significant difference in seed vigor were crossed as parents to produce F1,B1,B2 and F2 populations.The mixed major gene and polygenes inheritance analysis method was used to conduct models for germination potential,electrical conductivity and vigor index.【Result】The optimal genetic model for germination was a mixed model of two additive-dominant-epistatic major genes plus additive-dominant-epistatic polygenes.The heritability of major genes in B1,B2 and F2 was 66.62%,49.10% and 92.94%,respectively.The optimal genetic model for conductivity was a mixed model of one additive-dominant major gene plus additive-dominant polygenes.The heritability of major genes in B1,B2 and F2 was 57.75%,57.96% and 65.14%,respectively.The optimal genetic model for vigor index was a mixed model of two additive-dominant-epistatic major genes plus additive-dominant polygenes,and the heritability of major genes in B1,B2 and F2 was 66.49%,48.02% and 89.49%,respectively.All the three traits were dominated by heritability of major genes.【Conclusion】In breeding practice,genetic improvement and selection of waxy corn seed vigor can be carried out in low generations,and polymeric backcross or recurrent selection can be used to accumulate effective modifier genes and minor genes to improve breeding efficiency. |
| Key words: waxy corn seed vigor major gene+polygene mixture genetic model major gene inheritance |
