| 利用主基因+多基因混合遗传分析解析陆地棉铃重与铃壳率杂种优势的遗传基础 |
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| 引用本文： | 狄佳春,陈旭升,赵亮,章元明.利用主基因+多基因混合遗传分析解析陆地棉铃重与铃壳率杂种优势的遗传基础[J].棉花学报,2016,28(2):115-121. |
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| 作者姓名： | 狄佳春 陈旭升 赵亮 章元明 |
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| 作者单位： | 1. 南京农业大学作物遗传与种质创新国家重点实验室,江苏南京210095;江苏省农业科学院经济作物研究所/农业部长江下游棉花和油菜重点实验室,江苏南京210014;2. 江苏省农业科学院经济作物研究所/农业部长江下游棉花和油菜重点实验室,江苏南京,210014;3. 南京农业大学作物遗传与种质创新国家重点实验室,江苏南京,210095 |
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| 基金项目： | 国家科技重大专项——转基因生物新品种培育子课题(2011ZX08005-001) |
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| 摘 要： | 为明确棉花杂种F1铃重超亲优势的遗传基础,利用数量性状主基因+多基因混合遗传P1、P2、F1和F2群体联合分析方法,分析了铃重有超亲优势的3个组合L178×L029(Ⅰ)、L178×L057(Ⅱ)与L029×GP72(Ⅲ)的铃重与铃壳率。结果表明:3个组合F1铃重的超亲优势和铃壳率的负向中亲优势表现稳定。组合Ⅰ和ⅡF2群体的铃重与铃壳率呈极显著负相关。铃重和铃壳率均呈2对主基因+多基因遗传,但主基因作用方式在组合间有所不同。铃重超亲优势主要来自多基因显性效应,而组合Ⅲ的主基因显性×显性互作对铃重的超亲优势也有很大作用。组合Ⅰ和Ⅲ铃壳率的负向中亲优势主要来自于主基因显性效应,组合Ⅱ铃壳率的负向优势主要来自于多基因显性效应。因此,改良铃重和铃壳率时可通过轮回选择或修饰回交聚集增效基因来实现。
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| 关 键 词： | 陆地棉 铃重 铃壳率 主基因%2B多基因 杂种优势 基因互作 |
Genetic Foundation of Heterosis for Boll Weight and Shell Ratio in Upland Cotton (Gossypium hirsutum L.) Using Mixed Major-Genes Plus Polygenes Inheritance Analysis |
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| Institution: | 1. State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China; 2. Institute of Industrial Crops, Jiangsu Academy of Agricultural Sciences / Key Laboratory of Cotton and Rapeseed of Lower Reaches of Yangtze River, Ministry of Agriculture, Nanjing, Jiangsu 210014, China |
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| Abstract: | To understand the genetic foundation of over-parent heterosis for boll weight in upland cotton(Gossypium hirsutum L.), we used mixed major-genes plus polygenes inheritance analysis of P1, F1, P2, and F2 populations to investigate inheritance of boll weight and boll shell ratio in three over-parent heterosis crosses L178 × L029 (Ⅰ), L178 × L057 (Ⅱ), and L029 × GP72 (Ⅲ) in 2013. The results showed that over-parent heterosis for boll weight and negative mid-parent heterosis for boll shell ratio were stable in the three crosses. Boll weight was significantly and negatively correlated with boll shell ratio in the F2 populations of crosses Ⅰ and Ⅱ. The two traits were controlled by two major genes plus polygenes, although the action modes for the major genes varied across crosses. The over-parent heterosis of boll weight was mainly controlled by the dominance effect of polygenes, although significant dominance-by-dominance interactions for major genes was observed in cross Ⅲ. The negative mid-parent heterosis of boll shell ratio was found to be associated with the dominance effect of major genes in crosses Ⅰ and Ⅲ, and with the dominance effect of polygenes in cross Ⅱ. Therefore, recurrent selection and modified backcrossing can be used to pyramid cotton novel alleles to improve boll weight and boll shell ratio. |
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| Keywords: | upland cotton boll weight boll shell ratio major gene plus polygenes heterosis gene interaction |
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