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首页> 外文期刊>Genetics: A Periodical Record of Investigations Bearing on Heredity and Variation >Nucleotide Polymorphism and Linkage Disequilibrium Within and Among Natural Populations of European Aspen (Populus tremula L., Salicaceae)
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Nucleotide Polymorphism and Linkage Disequilibrium Within and Among Natural Populations of European Aspen (Populus tremula L., Salicaceae)

机译：欧洲白杨（Populus tremula L.，Salicaceae）自然种群内部和之中的核苷酸多态性和连锁不平衡

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摘要

Populus is an important model organism in forest biology, but levels of nucleotide polymorphisms and linkage disequilibrium have never been investigated in natural populations. Here I present a study on levels of nucleotide polymorphism, haplotype structure, and population subdivision in five nuclear genes in the European aspen Populus tremula. Results show substantial levels of genetic variation. Levels of silent site polymorphisms, πs, averaged 0.016 across the five genes. Linkage disequilibrium was generally low, extending only a few hundred base pairs, suggesting that rates of recombination are high in this obligate outcrossing species. Significant genetic differentiation was found at all five genes, with an average estimate of F ST = 0.116. Levels of polymorphism in P. tremula are 2- to 10-fold higher than those in other woody, long-lived perennial plants, such as Pinus and Cryptomeria. The high levels of nucleotide polymorphism and low linkage disequilibrium suggest that it may be possible to map functional variation to very fine scales in P. tremula using association-mapping approaches.
机译：胡杨是森林生物学中重要的模式生物，但是从未在自然种群中研究核苷酸多态性和连锁不平衡的水平。在这里，我提出了关于欧洲白杨三叶草中五个核基因核苷酸多态性，单倍型结构和种群细分的水平的研究。结果表明遗传变异水平较高。五个基因的沉默位点多态性水平πs平均为0.016。连锁不平衡通常很低，仅延伸了几百个碱基对，这表明在这种专性异交物种中重组率很高。在所有五个基因上发现了显着的遗传分化，平均估计为F ST = 0.116。银耳假单胞菌的多态性水平比其他木本长寿多年生植物（如松属和柳杉属）高2至10倍。高水平的核苷酸多态性和低连锁不平衡表明，可能有可能使用关联映射方法将功能变异映射到金银假单胞菌的非常精细的规模。

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