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首页> 外文期刊>European journal of nutrition >Genetic variation patterns of American chestnut populations at EST-SSRs
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Genetic variation patterns of American chestnut populations at EST-SSRs

机译：EST-SSRS美国栗子种群的遗传变异模式

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摘要

The objective of this study is to analyze patterns of genetic variation at genic expressed sequence tag simple sequence repeats (EST-SSRs) and at chloroplast DNA markers in populations of American chestnut (Castanea dentata Borkh.) to assist in conservation and breeding efforts. Allelic diversity at EST-SSRs decreased significantly from southwest to northeast along the Appalachian range, suggesting repeated founder events during postglacial migration. Comparatively high allelic diversity in Ontario, northwest of the Appalachian range, suggested more recent long-distance dispersal. Clinal variation of allele frequencies along the Appalachian axis was also in accordance with postglacial colonization from one refugium southwest of the Appalachian range. We observed clustering of the northwestern population from Ontario with southwestern populations and sharing of a rare chloroplast haplotype among western populations across the whole latitudinal range. This pattern is consistent with a divergence of postglacial migration routes and higher levels of more recent potentially human-mediated gene exchange between populations west of the Appalachian range. Population pairs east and west of the Appalachian axis showed pronounced allele frequency differences over a small geographic range. These patterns of genetic variation should be considered when sampling reproductive material for conservation and breeding.
机译：本研究的目的是分析基因表达的序列标签简单序列重复（EST-SSRS）的遗传变异模式，以及美国栗子（Castanea Dentata Borkh的群中的叶绿体DNA标记物，以协助保护和育种努力。 EST-SSRS的等位基因多样性沿着阿巴拉契亚范围从西南到东北都显着下降，建议在后期迁移期间重复的创始人事件。阿巴拉契亚州西北部的安大略省的相对高的等位基因，建议近期长途分散。沿着阿巴拉契亚轴的等位基因频率的抗溶膜变化也是根据阿巴拉契亚州西南部的一个refugium的后闪烁殖民化。我们观察了在整个纬度范围内与西南人群的西南人口和西南人口分享了西南人口的群集和分享了罕见的叶绿体单倍型。这种模式与海底迁移路线的分歧均一致，并且在阿巴拉契亚范围以西的群体之间的群体之间的更高水平的更高水平。人口对Appalachian轴的东部和西部显示出在小型地理范围内的发音等位基因频率差异。当采样用于保护和育种的生殖材料时，应考虑这些遗传变异模式。

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