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  • 潘志军,易自力,杨塞,肖亮.三倍体芒草自然杂交后代数量性状遗传多样性研究[J].植物遗传资源学报,2017,18(5):984-990.    [点击复制]
  • Pan zhi jun,易自力,杨塞,肖亮.Study on Genetic Diversity of Quantitative Traits in the natural hybrid progeny of Triploid Miscanthus[J].植物遗传资源学报,2017,18(5):984-990.   [点击复制]
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三倍体芒草自然杂交后代数量性状遗传多样性研究
潘志军,易自力,杨塞,肖亮
0
(湖南农业大学)
摘要:
本文以三倍体芒草“奇岗”的自然杂交后代为研究对象,对后代群体的16个数量性状分别进行变异分析、主成分分析和聚类分析。研究结果表明:(1)该杂交群体的变异系数在14.41%—151.85%之间,平均变异系数为51.22%,说明杂交后代变异广泛。(2)主成分分析结果表明,前四个主成分反映原变量的80.206%的信息。第1主成分贡献率为48.74%,较大载荷性状有分蘖数、丛径、基部周长、单株鲜重和单株干重;第2主成分贡献率为16.313%,较大载荷性状有外径、内径、单茎干重、单茎鲜重和含水量;第3主成分贡献率为7.775%,仅有腋芽数一个较大载荷性状;第4主成分贡献率为7.378%,仅叶片数一个较大载荷。(3)聚类分析结果表明,将66份奇岗自然杂交后代和6份母本奇岗种质分为4大类。第Ⅰ类材料因本身各性状不足,产量很低,不适合筛选高产种质。第Ⅱ类材料各性状变异系数普遍较小,性状稳定,适合作为育种的备选类群。第Ⅲ类材料因枯黄较少,更适合做发酵类能源草或青贮牧草。第Ⅳ类材料生物产量因子和其他构成因子都明显优于母本,是较好的育种材料。以上研究结果为筛选芒属植物优良种质,创新芒属植物种质资源有积极意义,并为芒属植物多倍体育种提供理论依据和材料基础。
关键词:  奇岗  主成分分析  聚类分析  遗传多样性  多倍体育种
DOI:10.13430/j.cnki.jpgr.2017.05.022
投稿时间:2017-01-03修订日期:2017-07-03
基金项目:
Study on Genetic Diversity of Quantitative Traits in the natural hybrid progeny of Triploid Miscanthus
Pan zhi jun,易自力,杨塞,肖亮
()
Abstract:
In the present work, 16 quantitative traits of natural triploid hybrid.Miscanthus x giganteus were analyzed using the method of variation analysis, principal component analysis and cluster analysis. The results showed that: (1) their variation coefficients ranged from 14.41% to151.85% with the means of 51.22%,which indicates that the variation of crossbreed is wide.(2) The principal component analysis results showed that the first four principal components can reflect 80.206% of the original variable information. The contribution rate of the first principal component is 48.74%, which is mainly contributed by the traits of tiller number per plant, cluster diameter, transect circumference, fresh weight per plant, and dry weight per plant;the second principal component contribution rate is 16.313%,which is mainly contributed by the traits of outside diameter, inside diameter, dry weight per stem, fresh weight per stem and moisture content;the third and fourth principal component contribution rate is 7.775% and 7.378% ,which is mainly composed by the trait of nodal bud number per stem,and the leaf number per stem respectively.(3)The cluster analysis results showed that 66 natural hybrid progeny and 6 female parent of Miscanthus x giganteus germplasm were divided into 4 groups.The first group is composed by the material with low biomass yield.The materials in the second group are suitable for breeding because the variation coefficient of all their traits is generally small and stable. The materials in the third group are characterized to keep evergreen and then are identified to be suitable for biogas fermentation or silage grass.The traits of yield and yield components of the materials belong to the fourth group are obviously superior to the female parent, indicating that they are good breeding materials.These above provide theoretical and material basis for screening and evaluating miscanthus germplasm and miscanthus breeding.
Key words:  Miscanthus×gigantus  principal component analysis  cluster analysis  genetic diversity  polyploid breeding

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