| 摘要: |
| 【目的】研究甜玉米茎秆强度性状的遗传模型，为甜玉米抗倒伏育种提供理论依据。【方法】以2个茎秆强度差异较大的自交系T49（抗倒伏）和T56（易倒伏）为亲本配制杂交组合，用“主基因+多基因混合遗传模型”分析方法对甜玉米茎秆强度性状进行分析。【结果】茎秆穿刺强度最佳遗传模型为D-0（1对加性-显性主基因+加性-显性-上位性多基因混合遗传模型），BC1、BC2、F2主基因遗传率分别为74.07%，45.30%，57.78%；茎秆抗压强度最佳遗传模型为E-0（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），BC1、BC2、F2主基因遗传率分别为44.15%，40.83%，62.97%；茎秆弯折性能最佳遗传模型为E-0（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），BC1、BC2、F2主基因遗传率分别为69.79%，40.89%，89.46%，3个性状均以主基因遗传为主。【结论】在育种实践中，对早期世代可进行玉米抗倒伏性遗传改良和选择，同时注意一定的环境因素，采用聚合回交或轮回选择来累积微效基因以提高育种效率。 |
| 关键词: 甜玉米 茎秆强度 主基因+多基因遗传模型 |
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| 基金项目:广东省重点领域研发计划项目（2018B020202013）；广东省教育厅特色创新项目（2016KTSCX061）；广东省农业厅种业提升项目（粤财农［2014］492号） |
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| Mixed major genes and polygenes inheritance analyses for stem strength traits of sweet corn |
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LIU Pengfei,ZHOU Fuliang,ZHOU Fuliang,LIANG Siwei,et al
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| Abstract: |
| 【Objective】The genetic model of stem strength traits of sweet corn was studied to provide basis for lodging resistance breeding.【Method】-A joint analysis of six generations of T49×T56 cross was performed using the mode of major genes and polygenes mixed inheritance.【Result】The best genetic model of stem puncture strength was D-0 (one major gene with additive-dominant effect and polygene with additive-dominant-epistatic effect),and the major gene heritability rates of BC1,BC2,and F2 were 74.07%,45.30%,and 57.78%,respectively.The best genetic model of stem compressive strength was E-0 (two major genes with additive-dominant-epistatic effect and polygene with additive dominant epistatic effect),and the major gene heritability rates of BC1,BC2,and F2 were 44.15%,40.83%,and 62.97%,respectively.The best genetic model of stem bending ability was E-0 (two major genes with additive-dominant-epistatic effect and polygene with additive-dominant-epistatic effect),and the major gene heritability rates of BC1,BC2,and F2 were 69.79%,40.89%,and 89.46%,respectively.【Conclusion】The puncture strength,compressive strength and bending ability of maize stem were mainly inherited by major genes.This result can be used as a reference for breeding lodging resistant sweet corn varieties. |
| Key words: sweet corn stem strength major gene and polygene genetic analysis |
