Ancestral State Reconstruction Reveals Rampant Homoplasy of Diagnostic Morphological Characters in Urticaceae, Conflicting with Current Classification Schemes.
Ancestral State Reconstruction Reveals Rampant Homoplasy of Diagnostic Morphological Characters in Urticaceae, Conflicting with Current Classification Schemes.
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祖先状态重建揭示了荨麻科诊断形态特征的猖獗同质性，与当前的分类方案相冲突
DOI：
10.1371/journal.pone.0141821
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Li DZ
中科院分区：
文献类型：
--
作者：
Wu ZY;Milne RI;Chen CJ;Liu J;Wang H;Li DZ
荨麻科有2000多种，具有显著的形态多样性。它经历了许多分类重组，目前是进一步系统研究的主题。为了在系统研究中获得更多的分辨率，并更好地了解荨麻科植物性状进化的一般模式，基于我们之前的系统发育，包括47个荨麻科属122个物种的169份资料，我们检查了19个诊断性状，并采用最大简约和最大似然方法对这些性状进行了分析。结果表明，16个性状在家族内部表现出多重状态变化，其中10个性状表现出bb0 - 8状态变化，3个性状表现出28 - 40状态变化。形态学上的突触被鉴定为许多分支，但由于分支内部的逆转和/或其他地方的同源性，这些诊断价值往往受到限制。在亚科水平上，可以通过为每个分支精心选择的少数定义特征来识别组成家族的四个分支。一些非单系属似乎只能通过其分支内的半胚性特征来定义，更详细的工作将有价值在这些分支中找到单系分支的定义特征。由于生境或植被类型的变化，荨麻科植物的一些性状进化可归因于适应性进化。本研究证明了利用系统发育来追踪性状进化的价值，并确定了形态性状对分类的相对重要性。
Urticaceae is a family with more than 2000 species, which contains remarkable morphological diversity. It has undergone many taxonomic reorganizations, and is currently the subject of further systematic studies. To gain more resolution in systematic studies and to better understand the general patterns of character evolution in Urticaceae, based on our previous phylogeny including 169 accessions comprising 122 species across 47 Urticaceae genera, we examined 19 diagnostic characters, and analysed these employing both maximum-parsimony and maximum-likelihood approaches. Our results revealed that 16 characters exhibited multiple state changes within the family, with ten exhibiting >eight changes and three exhibiting between 28 and 40. Morphological synapomorphies were identified for many clades, but the diagnostic value of these was often limited due to reversals within the clade and/or homoplasies elsewhere. Recognition of the four clades comprising the family at subfamily level can be supported by a small number carefully chosen defining traits for each. Several non-monophyletic genera appear to be defined only by characters that are plesiomorphic within their clades, and more detailed work would be valuable to find defining traits for monophyletic clades within these. Some character evolution may be attributed to adaptive evolution in Urticaceae due to shifts in habitat or vegetation type. This study demonstrated the value of using phylogeny to trace character evolution, and determine the relative importance of morphological traits for classification.
影响因子：
3.7
作者：
Couvreur TL;Gort G;Richardson JE;Sosef MS;Chatrou LW
通讯作者：
Chatrou LW