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首页> 外文期刊>Molecular phylogenetics and evolution >Conflict amongst chloroplast DNA sequences obscures the phylogeny of a group of Asplenium ferns
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Conflict amongst chloroplast DNA sequences obscures the phylogeny of a group of Asplenium ferns

机译：叶绿体DNA序列之间的冲突掩盖了一组天竺葵蕨类植物的系统发育

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摘要

A previous study of the relationships amongst three subgroups of the Austral Asplenium ferns found conflicting signal between the two chloroplast loci investigated. Because organelle genomes like those of chloroplasts and mitochondria are thought to be non-recombining, with a single evolutionary history, we sequenced four additional chloroplast loci with the expectation that this would resolve these relationships. Instead, the conflict was only magnified. Although tree-building analyses favoured one of the three possible trees, one of the alternative trees actually had one more supporting site (six versus five) and received greater support in spectral and neighbor-net analyses. Simulations suggested that chance alone was unlikely to produce strong support for two of the possible trees and none for the third. Likelihood permutation tests indicated that the concatenated chloroplast sequence data appeared to have experienced recombination. However, recombination between the chloroplast genomes of different species would be highly atypical, and corollary supporting observations, like chloroplast heteroplasmy, are lacking. Wider taxon sampling clarified the composition of the Austral group, but the conflicting signal meant analyses (e.g., morphological evolution, biogeographic) conditional on a well-supported phylogeny could not be performed. (C) 2008 Elsevier Inc. All rights reserved.
机译：先前对南方天竺葵蕨类三个亚群之间关系的研究发现，所研究的两个叶绿体基因座之间存在冲突信号。因为像单个叶绿体和线粒体那样的细胞器基因组被认为是非重组的，具有单一的进化历史，所以我们对另外四个叶绿体基因座进行了测序，期望这将解决这些关系。相反，冲突只是放大了。尽管树木构建分析偏爱三棵可能的树之一，但其中一棵替代树实际上具有一个支持站点（六对五），并且在频谱和邻居网络分析中得到了更大的支持。模拟表明，仅凭机会不可能为其中两棵可能的树提供强有力的支持，而对第三棵树则没有任何支持。似然性排列测试表明，级联的叶绿体序列数据似乎经历了重组。但是，不同物种的叶绿体基因组之间的重组是非常不典型的，并且缺乏像叶绿体异质性这样的推论支持性观察。较广泛的分类单元采样澄清了南方群的组成，但相互矛盾的信号意味着无法进行以良好系统发育为条件的分析（例如形态演化，生物地理）。 （C）2008 Elsevier Inc.保留所有权利。

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