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首页> 外文期刊>Chinese science bulletin >Phylogeny and divergence of Chinese Angiopteridaceae based on chloroplast DNA sequence data (rbcL and trnL-F)
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Phylogeny and divergence of Chinese Angiopteridaceae based on chloroplast DNA sequence data (rbcL and trnL-F)

机译：基于叶绿体DNA序列数据（rbcL和trnL-F）的中国血管翅目科的系统发育和趋异

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摘要

Marattioid ferns are an ancient lineage of primitive vascular plants that first appeared in the middle Carboniferous. Extant members are almost exclusively restricted to tropical regions, and the species-rich family Angiopteridaceae are limited in their distribution to the eastern hemisphere; relationships within the group are currently vague. Here the phylogenetic relationship between Angiopteris Hoffm. and Archangiopteris Christ et Gies. was evaluated based on the sequence analysis of chloroplast rbcL gene and trnL-F intergenic spacer with MEGA2 and MrBayes v3.0b4. On the basis of the phylogenetic pattern and fossil record, we further estimated the divergence time for the two genera. The phylogenetic trees revealed that all species of Angiopteris and Archangiopteris in this study formed a monophyletic group with strong statistical support, but the relationship between the two genera remained unresolved based on individual sequence analysis. On the other hand, the sequence analyses of combined data set revealed that Archangiopteris species diverged first, indicating that Archangiopteris may not be a direct derivative as traditionally assumed. The clade of Angiopteris and Archangiopteris appears to have diversified in the late Oligocene (≈26 Ma) based on the molecular estimate. Thus, the evolutionary history of extant Angiopteris and Archangiopteris has been characterized by ancient origin and recent diversification, and these groups are not relic and endangered lineages as traditionally considered.
机译：马拉提蕨类植物是最早出现在石炭纪中部的原始维管植物的古老谱系。现存成员几乎完全限于热带地区，物种丰富的血管翅目科在东半球分布有限；小组内部的关系目前尚不明确。在这里，Angiopteris Hoffm之间的系统发育关系。和Archangiopteris Christ et Gies。基于叶绿体rbcL基因和trnL-F基因间隔子与MEGA2和MrBayes v3.0b4的序列分析，进行了评估。根据系统发育模式和化石记录，我们进一步估计了两个属的发散时间。系统发育树表明，本研究中的所有种类的血管纲和原虫都形成了具有强大统计支持的单系统群，但是根据个体序列分析，这两个属之间的关系仍未解决。另一方面，组合数据集的序列分析表明，始祖鸟物种首先发生分歧，这表明始祖鸟可能不是传统假设的直接衍生物。根据分子估计，在渐新世晚期（约26 Ma），Anangiopteris和Arcangangiopteris进化枝似乎已经多样化。因此，现存的Anopteropteris和Archangiopteris的进化历史具有古代起源和最近的多样化特征，而这些族群并不是传统上认为的遗物和濒危物种。

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