Phylogenomics recovers monophyly and early Tertiary diversification of Dipteronia (Sapindaceae)
Phylogenomics recovers monophyly and early Tertiary diversification of Dipteronia (Sapindaceae)
复制标题
系统发育学恢复了双翅目（无患子科）的单系性和早期第三纪多样化
DOI：
10.1016/j.ympev.2018.09.012
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发表时间：
2019-01-01
影响因子：
4.1
通讯作者：
Qiu, Ying-Xiong
中科院分区：
文献类型：
--
作者：
Feng, Yu;Comes, Hans Peter;Qiu, Ying-Xiong
金钱槭属（Dipteronia）是无患子科（Sapindaceae）的一个古老的孑遗木本植物属，仅包括两个现存的中国西南和中部特有种。金钱槭属和槭属在形态学上有许多共同特征，长期以来被认为是传统槭科的姐妹类群。然而，分子遗传学通常没有解决的系统发育的位置Dipteronia，特别是不是在其预期的位置作为姐妹的宏基。在这项研究中，我们提出了大规模的基因组数据集，将完整的叶绿体（CP）基因组序列和转录组数据从13无患子科物种，以解决Dipteronia和槭之间的系统发育关系。此外，长分支吸引力（LBA）文物和推断的拓扑结构的鲁棒性的影响进行评估的长分支排除和合并为基础的方法。证实经典的基于形态学的分类，cp基因组和核数据集（2466 co-or-thetamine基因和273 co-SCNGs）恢复Dipteronia和Acer作为相互单系群。此外，我们的化石校准的分子生物学的日期冠现存的两个Dipteronia物种的古新世/始新世的边界，这意味着这些形态高度相似的类群是最古老的“活化石”的东亚植物群。
Dipteronia (Sapindaceae) is an ancient relict woody genus, and contains just two extant species endemic to Southwestern and Central China. As sharing numerous morphological characters, Dipteronia and Acer have long been considered as sister groups forming the traditional family Aceraceae. However, molecular phylogenetics has generally not resolved the phylogenetic placement of Dipteronia, especially not in its expected position as sister to Acer. In this study, we present large-scale, phylogenomic data sets, incorporating complete chloroplast (cp) genome sequences and transcriptome data from 13 Sapindaceae species, to resolve the phylogenetic relationship between Dipteronia and Acer. Moreover, the impact of long-branch attraction (LBA) artefacts and robustness of inferred topologies are assessed by long-branch excluding and coalescent-based methods. Corroborating classical morphology-based classifications, both cp genome and nuclear datasets (2466 co-or-thologous genes and 273 co-SCNGs) recover Dipteronia and Acer as mutually monophyletic groups. In addition, our fossil-calibrated molecular phylogenies date the crown of the two extant Dipteronia species to the Paleocene/Eocene boundary, implying that these morphologically highly similar taxa are amongst the oldest 'living fossils' of the East Asian Flora.