Phylogenetics, morphology and circumscription of Cambessedesieae: a new Neotropical tribe of Melastomataceae
Phylogenetics, morphology and circumscription of Cambessedesieae: a new Neotropical tribe of Melastomataceae
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DOI：
10.1093/botlinnean/boz018
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发表时间：
2019-07-01
影响因子：
2.4
通讯作者：
Goldenberg, Renato
中科院分区：
文献类型：
--
作者：
Bochorny, Thuane;Michelangeli, Fabian A.;Goldenberg, Renato
基于DNA序列的系统性研究表明，一些传统的部落划分仍然没有得到解决，例如“Merianthera and allies”分支，这是一个非正式的群体，尚未正式分配到一个部落。这个分支包括Behuria，Cambessedesia，Dolichoura，Huberia和Merianthera，主要出现在巴西的大西洋森林和塞拉多生物群落的高海拔地区。基于整体相似的形态学，Behuria，Dolichoura，Huberia和Merianthera传统上被置于Merianieae中。将Cambessedesia归入Microlicieae的说法受到质疑，其部落位置需要重新评估。为了推断属的单系性和修改属的限制，我们分析了DNA标记的三个质体（atpF-atpH，psbK-psbL和trnS-trnG），两个核糖体（nrETS和nrITS）和一段低拷贝核基因（蜡质），使用最大似然法和贝叶斯推断。我们还选择了12个形态特征重建祖先的字符估计分析。我们的研究结果恢复Cambessedesia和Merianthera作为单系谱系与单系Huberia和Dolichoura嵌套在一个并系Behuria。根据分子、形态和地理资料，首次提出并描述了Cambessedesieae族。Cambessedesieae由Cambessedesia、Merianthera和扩展的Huberia（包括Behuria和Dolichoura）组成。
Systematic studies based on DNA sequences have shown that some traditional tribal delimitations in Melastomataceae remain unresolved, such as the 'Merianthera and allies' clade, an informal group which has not been formally assigned to a tribe. This clade includes Behuria, Cambessedesia, Dolichoura, Huberia and Merianthera and occurs mainly at high elevations in the Atlantic Forest and cerrado biomes of Brazil. Behuria, Dolichoura, Huberia and Merianthera were tradionally placed in Merianieae based on overall similar morphology. The assignment of Cambessedesia to Microlicieae has been challenged and its tribal placement needs re-evaluation. To infer the monophyly of the genera and revise generic limits we analysed DNA markers of three plastid (atpF-atpH, psbK-psbL and trnS-trnG), two ribosomal (nrETS and nrITS) and a segment of a low-copy nuclear gene (waxy), using maximum likelihood and Bayesian inference. We also selected 12 morphological characters to reconstruct an ancestral character estimation analysis. Our results recovered Cambessedesia and Merianthera as monophyletic lineages together with monophyletic Huberia and Dolichoura nested in a paraphyletic Behuria. We propose and describe for the first time the tribe Cambessedesieae based on molecular, morphological and geographical data. As recognized here, Cambessedesieae consist of Cambessedesia, Merianthera and an expanded Huberia (including Behuria and Dolichoura).