Molecular Phylogeny Estimation of the Bamboo Genus Chusquea (Poaceae: Bambusoideae: Bambuseae) and Description of Two New Subgenera
Molecular Phylogeny Estimation of the Bamboo Genus Chusquea (Poaceae: Bambusoideae: Bambuseae) and Description of Two New Subgenera
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DOI：
10.1600/036364414x681554
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发表时间：
2014-07-01
影响因子：
1
通讯作者：
Kelchner, Scot A.
中科院分区：
文献类型：
--
作者：
Fisher, Amanda E.;Clark, Lynn G.;Kelchner, Scot A.
Chusquea 是美洲木本竹的一个多样化属，几乎占新热带地区木本竹种类的一半。先前的分子数据分析已经恢复了Chusquea内的四个主要谱系，但仅鉴定了Rettbergia亚属的形态共源性。这项研究估计了 Chusquea 的叶绿体系统发育，重点是大型且棘手的 Euchusquea 分支内部的关系。对 40% 的 Chusquea 物种进行了系统发育分析，数据来自五个叶绿体区域，并对核内转录间隔复合体进行了初步调查。先前研究的一些结果得到了证实，包括以前包含神经鳞属和雷特伯格亚属的单系的两个分支的存在。基于分子支持和潜在的形态共性，以前在 Neurolepis 中的进化枝被命名为 Chusquea subgenus Platonic 和 Chusquea subgenus Magnifoliae。我们在Euchusquea内恢复了两个强支持的分支和五个弱支持的分支，但这些谱系之间的关系尚未解决，并且分支的物种组成与当前基于形态的分类学分组强烈冲突。叶绿体系统发育估计的低分辨率、核数据的低变异性、特征冲突和叶绿体谱系的地理分布都表明Euchusquea进化枝的近期辐射。鉴于目前对Euchusquea内部关系的分子支持较弱，并且缺乏定义分支的同源形态特征，我们建议使用当前基于形态的分类学作为评估和描述Euchusquea分支多样性的实用手段。
Chusquea is a diverse genus of American woody bamboos, accounting for almost half of the woody bamboo species in the Neotropics. Previous analyses of molecular data have recovered four major lineages within Chusquea, but morphological synapomorphies have been identified only for subgenus Rettbergia. This study estimates a chloroplast phylogeny of Chusquea with a focus on relationships within the large and intractable Euchusquea clade. Phylogenetic analyses were conducted on 40% of the described species in Chusquea, with data from five chloroplast regions and a preliminary survey of the nuclear internal transcribed spacer complex. Several results from previous studies were corroborated, including the presence of two clades formerly comprising the genus Neurolepis and monophyly of subgenus Rettbergia. The clades formerly in Neurolepis are named as Chusquea subgenus Platonic and Chusquea subgenus Magnifoliae based on molecular support and potential morphological synapomorphies. We recovered two strongly supported and five weakly supported clades within Euchusquea, but relationships among these lineages were not resolved and species composition of the clades conflicts strongly with current taxonomic groupings based on morphology. Low resolution of the chloroplast phylogeny estimation, low variability in nuclear data, character conflict, and geographical distribution of chloroplast lineages all suggest a recent radiation of the Euchusquea clade. Given the present weak molecular support for relationships within Euchusquea and the lack of synapomorphic morphological characters to define clades, we recommend the use of the current morphology-based taxonomy as a practical means of assessing and describing diversity in the Euchusquea clade.