Microsatellite polymorphism in natural populations of the wild plant Arabidopsis thaliana.
Microsatellite polymorphism in natural populations of the wild plant Arabidopsis thaliana.
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DOI：
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发表时间：
1997-08
期刊：
影响因子：
3.3
通讯作者：
H. Innan;H. Innan;R. Terauchi;N. Miyashita
中科院分区：
文献类型：
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作者：
H. Innan;H. Innan;R. Terauchi;N. Miyashita
以拟南芥（Arabidopsis thaliana）20个微卫星位点为研究对象，在全球范围内对42个生态型进行了重复序列多态性分析。有大量的变化，在微卫星位点，尽管自交的性质，这种植物物种。平均基因多样性为0.794，平均等位基因数为10.6。等位基因的分布大多集中在重复数的平均值附近，但不能视为正态分布。重复次数与变异量呈显著正相关。对于大多数基因座，观察到的等位基因数量介于无限等位基因和逐步突变模型的预期值之间。这两个模型均被符号检验所拒绝。在12.1%的位点间配对比较中检测到连锁不平衡。在系统发育树中，生态型与地理来源没有关联。这一结果与A. Thaliana全世界
Variation in repeat number at 20 microsatellite loci of Arabidopsis thaliana was studied in a worldwide sample of 42 ecotypes to investigate the pattern and level of polymorphism in repetitive sequences in natural plant populations. There is a substantial amount of variation at microsatellite loci despite the selfing nature of this plant species. The average gene diversity was 0.794 and the average number of alleles per locus was 10.6. The distribution of alleles was centered around the mean of repeat number at most loci, but could not be regarded as normal. There was a significantly positive correlation between the number of repeats and the amount of variation. For most loci, the observed number of alleles was between the expected values of the infinite allele and stepwise mutation models. The two models were rejected by the sign test. Linkage disequilibrium was detected in 12.1% of the pairwise comparisons between loci. In phylogenetic tree, there was no association between ecotype and geographic origin. This result is consistent with the recent expansion of A. thaliana throughout the world.