| 摘要: |
| 【目的】研究甜玉米果皮厚度的遗传模式，为甜玉米品质改良和分子标记辅助选择提供理论依据。【方法】以果皮厚度有显著差异的甜玉米自交系T4 和T19 为亲本配制杂交组合, 用主基因+多基因混合遗传模型及P1、P2、F1、B1、B2 和 F2 共 6个世代联合分析的方法，对甜玉米果皮厚度性状进行分析。【结果】 果皮厚度的最适遗传模型为D 2，即1 对加性主基因+加性 显性多基因混合遗传；主基因遗传率大于相应分离世代的多基因遗传率，B1、B2、F2群体的主基因遗传率分别为59.65%,55.17%和65.24%，多基因遗传率分别为37.84%，41.40%和32.65%，主基因的加性效应值为-27.186 4，多基因的加性效应值为0.289 5，显性效应值为5.742 3。【结论】甜玉米果皮厚度以主基因遗传为主，育种中既要重视利用主基因，也要考虑多基因对性状的影响。 |
| 关键词: 甜玉米 果皮厚度 主基因+多基因；遗传效应 |
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| 基金项目:国家农业部公益性行业专项(201303008)；广东省科技计划项目(2010B020302010,2012B20301006) |
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| Major genes and polygenes inheritance for pericarpthickness of sweet corn |
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| Abstract: |
| 【Objective】The aim was to study the genetic mode of sweet corn pericarp thickness to improve sweet corn breeding and molecular marker-assisted selection (MAS).【Method】Cross combination was designed by selecting two sweet corn inbred ( T4 and T19) with different pericarp thicknesses.A joint analysis of six generations（P1,P2,F1,B1,B2 and F2）from a cross of T19×T4 was performed using the mode of major genes and polygenes mixed inheritance of quantitative traits.【Result】The result showed that the best genetic model for pericarp thickness was D2（one major=gene with additive effect and polygene with additive=dominant effect).The heritabilities of major genes were greater than polygenes in the corresponding separation of generation.The major gene heritabilities of B1,B2,and F2 were 59.65%,55.17%,and 65.24% respectively,and their heritabilities of corresponding polygenes were 37.84%,41.40%,and 32.65% respectively.Major genes additive effect was -27.186 4,polygenes additive effect was 0.289 5,and dominant effect was 5.742 3.【Conclusion】The inheritance of the major gene was dominant in pericarp thickness.These results suggested that the attention should be paid to both major genes and polygenes when breeding sweet corn. |
| Key words: sweet corn pericarp thickness major gene and polygene gene effect |
