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首页> 外文期刊>Genetic Resources and Crop Evolution >Isozyme variation and genetic structure of populations of Avena barbata from Argentina.
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Isozyme variation and genetic structure of populations of Avena barbata from Argentina.

机译：阿根廷阿韦纳酵母的同工酶变异和遗传结构。

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摘要

Genetic diversity was analysed in 52 Argentinian populations of Avena barbata, a tetraploid grass introduced in America from Spain during the colonization period. Nine isozyme systems were studied and 14 loci identified, five of which were polymorphic. Cluster analysis based on Hedrick's index revealed a high similarity among populations. The total diversity (PT) in the 52 populations was 0.144, the mean diversity (PS) was 0.04, while between population diversity (DST) was 0.103. The resulting coefficient of differentiation (GST) was 0.714, indicating that diversity among populations was an important contributor to the total variability. Genetic diversity was structured into multilocus associations; 122 different complexes were found among 3311 individuals, but only two complexes occurred at a high frequency. The distribution pattern of these frequent multilocus genotypes was associated with environmental factors, mainly rainfall and temperature. The comparison of these results with those of previous studies on A. barbata from Spain indicated that Spanish and Argentinian populations are closely similar in allelic composition on a locus-by-locus basis but different in multilocus genotypic composition. We concluded that selection was the main force involved in the reorganization of the Spanish genepool into novel multilocus associations adapted to specific habitats in Argentina..
机译：在殖民时期，从西班牙引入美国的四倍体草中的52个阿根廷阿维纳巴巴达（Avena barbata）种群中分析了遗传多样性。研究了九个同工酶系统并鉴定了14个基因座，其中五个是多态的。基于Hedrick指数的聚类分析显示出人群之间的高度相似性。 52个人群的总多样性（PT）为0.144，平均多样性（PS）为0.04，而人群之间的多样性（DST）为0.103。最终的分化系数（GST）为0.714，表明人群之间的多样性是总变异性的重要贡献者。遗传多样性被组织成多基因座关联;在3311个人中发现了122种不同的复合物，但是只有两种复合物以高频率发生。这些常见的多基因座基因型的分布模式与环境因素有关，主要是降雨和温度。将这些结果与先前对西班牙芭蕉的研究进行的比较表明，西班牙和阿根廷人群在等位基因基础上的等位基因组成非常相似，但在多位点基因型组成上却不同。我们得出的结论是，选择是西班牙种质资源重组为适应阿根廷特定栖息地的新型多基因位点协会的主要力量。

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