Exploring generic delimitation within the fern family Thelypteridaceae
Exploring generic delimitation within the fern family Thelypteridaceae
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探索蕨类植物 Thelypteridaceae 内的属属界定
DOI：
10.1016/j.ympev.2012.07.021
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发表时间：
2012-11-01
影响因子：
4.1
通讯作者：
Zhang, Xian-Chun
中科院分区：
文献类型：
--
作者：
He, Li-Juan;Zhang, Xian-Chun
金星蕨科是水龙骨科最大的科之一。该科的属的分类仍然是有争议的，因为高水平的趋同或平行进化的形态特征和缺乏分子系统发育研究。在本研究中，3个叶绿体区域（rbcL，rps 4和trnL-trnF基因间间隔区）的115个分类群，代表27个公认的分离在家庭，进行系统发育分析，以探讨infrafamilial关系，并获得进一步了解属的界限。系统发育重建解决了6个不同的分支（凯德I-VI）的强有力的支持。七属：Cyclogramma，Macrothelypteris，Oreopteris，Phegopteris，Pseudophegopteris，Stegnogramma，和Thelypteris被认为是从分支I，II，IV，和V.在凯德III，Metathelypteris被支持为单系，但其他分离Amauropelta，Coryphopteris，和Parathelypteris是多系或并系，防止在此分支内没有额外的采样明确识别属的边界。考虑到进化枝VI内的巨大形态相似性，一个大的属毛蕨属被认为是由几个小的被识别的分离子组成的。在该分支中，新月蕨属和小Christella被揭示为多系，但一些亚洲特有的分离，如Glaphyropteridopsis，Mesopteris和Pseudocyclosorus被强烈支持为单系。对形态性状状态的分子遗传进化分析表明，许多诊断性状具有极高的同源性进化水平。(C)2012 Elsevier Inc. All rights reserved.
Thelypteridaceae is one of the largest families of polypodioid ferns. The generic classification of the family is still controversial because of high levels of convergent or parallel evolution of morphological characters and a lack of molecular phylogenetic studies. In the present study, phylogenetic analyses of three chloroplast regions (rbcL, rps4 and trnL-trnF intergenic spacer region) for 115 taxa, representing 27 recognized segregates in the family, were conducted to explore infrafamilial relationships and gain further understanding of generic boundaries. The phylogenetic reconstructions resolved six distinct clades (Cade I-VI) with strong support. Seven genera: Cyclogramma, Macrothelypteris, Oreopteris, Phegopteris, Pseudophegopteris, Stegnogramma, and Thelypteris are recognized from Clades I, II, IV, and V. In Cade III, Metathelypteris was supported as monophyletic, but the other segregates Amauropelta, Coryphopteris, and Parathelypteris were polyphyletic or paraphyletic, preventing clear recognition of generic boundaries within this clade without additional sampling. Considering great morphological homoplasy within Clade VI, a large genus Cyclosorus is recognized to comprise several small recognized segregates. Within this clade, Pronephrium, and Christella were revealed to be polyphyletic, but several Asian-endemic segregates, such as Glaphyropteridopsis, Mesopteris, and Pseudocyclosorus were strongly supported as monophyletic. Analyses of the evolution of morphological character states on the molecular phylogeny showed extremely high levels of homoplastic evolution for many diagnostic characters. (C) 2012 Elsevier Inc. All rights reserved.