Untangling the phylogeny of Leandra s.str. (Melastomataceae, Miconieae).
Untangling the phylogeny of Leandra s.str. (Melastomataceae, Miconieae).
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DOI：
10.1016/j.ympev.2015.11.015
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发表时间：
2016-03
影响因子：
4.1
通讯作者：
M. Reginato;F. Michelangeli
中科院分区：
文献类型：
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作者：
M. Reginato;F. Michelangeli
系统发育研究表明，在当前的分类中，有必要进行分类重排。尽管如此，黑口类是最多样化的植物群之一，已经观察到几个已知的人工分类群的案例，并等待进一步的解决。Leandras.str. clade，with ca. 200种，包括传统上在Leandra属中处理的大部分分类群，几乎仅限于巴西东部。在早期的研究中，曾有人试图推断Leandras.str.，但在进化枝内部取样稀疏且分辨率低。在这里，我们试图提供一个改进的系统发育假说，为进一步的研究奠定基础。具体而言，我们提供了一个全面的分类单元采样，并试图推断这一组的物种树，解剖潜在的噪音在系统发育重建，如旁系，流氓类群，杂交和不完整的谱系排序。我们的数据集包括126个内类群物种（192个终端）和四个分区（六个标记）。我们实现了用于物种树推断的BEAST模型，并执行了几种模拟方法来评估模型拟合，并讨论了所观察到的模式的潜在原因。主要谱系ofLeandras.str.划定，严格分叉的物种树模型似乎不能解释观察到的数据，杂交很可能是一个重要的进化力量在这个组。
Phylogenetic studies in Melastomataceae have demonstrated the need for taxonomic rearrangements in the current classification. Nonetheless, melastomes are among the most diverse groups of plants and several cases of known artificial taxa have been observed and awaiting further resolution. TheLeandras.str. clade, with ca. 200 species, includes the majority of the taxa traditionally treated in the genusLeandraand is almost restricted to eastern Brazil. In earlier studies, some attempts have been made to infer the relationships withinLeandras.str., but the sampling was sparse and the resolution low inside the clade. Here, we attempt to provide an improved phylogenetic hypothesis for this group on which to base further studies. Specifically, we provide a comprehensive taxon sampling and attempt to infer a species tree for this group, dissecting potential noise in the phylogenetic reconstruction, such as paralogy, rogue taxa, hybridization and incomplete lineage sorting. Our data set includes 126 ingroup species (192 terminals) and four partitions (six markers). We implement the∗BEAST model for species tree inference and perform several simulation methods to assess model fit and to discuss potential causes for the observed patterns. Major lineages ofLeandras.str. were delineated, a strictly bifurcating species tree model seems to not account for the observed data, and hybridization is very likely an important evolutionary force in this group.