Phylogeny and dating of divergences within the genus Thymallus (Salmonidae: Thymallinae) using complete mitochondrial genomes

文献类型： 外文期刊

第一作者： Ma, Bo

作者： Ma, Bo;Sun, Peng;Jiang, Haiying;Chen, Jinping;Li, Linmiao;Zhang, Xiujuan;Yuan, Lihong;Jiang, Haiying;Chen, Jinping;Li, Linmiao;Zhang, Xiujuan;Yuan, Lihong;Jiang, Haiying;Chen, Jinping;Li, Linmiao;Zhang, Xiujuan;Yuan, Lihong

作者机构：

关键词： Divergence date;grayling;mitochondrial DNA;phylogeny;Salmonidae

期刊名称：MITOCHONDRIAL DNA PART A （ 影响因子：1.514； 五年影响因子：0.707 ）

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年卷期：

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收录情况： SCI

摘要： The genus Thymallus has attracted increasing attention in recent years because of its sharp demographic decline. In this study, we reported four complete mitochondrial genomes in the Thymallus genus: Baikal-Lena grayling (7". arcticus baicalolenensis), lower Amur grayling (T. tugarinae), Yalu grayling (T. a. yaluensis), and Mongolian grayling [T. brevirostris). The total length of the four new grayling mtDNAs ranged from 16658 to 16663bp, all of which contained 13 protein-coding genes, 22 tRNA genes, two rRNA genes, and one control region. The results suggested that mitochondrial genomes could be a powerful marker for resolving the phylogeny within Thymallinae. Our study validated that the Yalu grayling should be a synonym of the Amur grayling [T. grubii) at the whole mitogenome level. The phylogenetic and dating analyses placed the Amur grayling at the deepest divergence node within Thymallus, diverging at ~14.95 Ma. The lower Amur grayling diverged at the next deepest node (~12.14 Ma). This was followed by 7". thymallus, which diverged at ~9.27 Ma. The Mongolian grayling and the ancestor of the sister species, T. arcticus and T. arcticus baicalolenensis, diverged at ~7.79 Ma, with T. arcticus and T. arcticus baicalolenensis separating at ~6.64 Ma.Our study provides far better resolution of the phylogenetic relationships and divergence dates of graylings than previous studies.

分类号： Q7

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