基于线粒体基因组的白甲鱼属分子系统发育学研究

从基本形态上分类, 白甲鱼属(Onychostoma)隶属鲤形目(Cypriniformes)、鲤科(Cyprinidae)、鲃亚科(Barbinae), 其中包含19个种。然而, 白甲鱼属内的分子系统发育学关系并不是很清楚。基于整个线粒体基因组序列, 以斑马鱼(Danio rerio)和倒刺鲃(Spinibarbus denticulatus)为外类群, 分析了8种白甲鱼属的分子系统发育学关系。结果表明, 白甲鱼属内的8个物种不是1个单类群, 其中包括3个分支: 多鳞白甲鱼(Onychostoma macrolepis)、小口白甲鱼(Onychostoma lini)、粗须白甲鱼(Onychostoma barbatum)和台湾白甲鱼(Onychostoma barbatulum)为一个分支, 南方白甲鱼(Onychostoma gerlachi)和白甲鱼(Onychostoma simum)一个分支, 稀有白甲鱼(Onychostoma rara)和高身白甲鱼(Onychostoma alticorpus)为一个分支。研究结果和传统的形态学分类学结果大致一样, 均分为3个分支。研究使用线粒体全基因组进行白甲鱼属系统发育学研究, 为白甲鱼属的系统发育学填补相关方面空白。

MOLECULAR PHYLOGENY OF ONYCHOSTOMA (CYPRINIDAE) BASED ON MITOCHONDRIAL GENOMES

The Onychostoma belongs to cyprinid group and contains 19 species from essentially morphological classification. However, the molecular phylogenetic relationship of Onychostoma, was not very clear. Here, we presented molecular phylogenetic analysis of 8 species in Onychostoma based on the whole mitochondrial genome sequence with Danio rerio and Spinibarbus denticulatus as outgroups. The results indicated that Onychostoma did not appear monophyletic which included 3 groups: Onychostoma macrolepis, Onychostoma lini andOnychostoma barbatum. O. barbatulum in clade 1, Onychostoma gerlachi and Onychostoma simum in clade 2, Onychostoma rara and Onychostoma alticorpus in clade 3. The result was roughly the same as the traditional morphological classification, which divides Onychostoma into three branches. The mitochondrial whole genome was firstly used in Phylogenetic research of Onychostoma and filled the shortage of Phylogenetic studies of this genus.