Molecular Phylogeny of the Cliff Ferns (Woodsiaceae: Polypodiales) with a Proposed Infrageneric Classification.
Molecular Phylogeny of the Cliff Ferns (Woodsiaceae: Polypodiales) with a Proposed Infrageneric Classification.
复制标题
悬崖蕨类植物（Woodsiaceae：Polypodiales）的分子系统发育与拟议的下属分类
DOI：
10.1371/journal.pone.0136318
复制
发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Xiang Q
中科院分区：
文献类型：
--
作者：
Shao Y;Wei R;Zhang X;Xiang Q
岩蕨科自成立以来，在科属等级上经历了频繁的分类变化。其大部分物种被置于Woodsia，而Cheilanthopsis，Hymenocystis，Physematium和Protowoodsia被一些作者认为是分离的。由于岩蕨科的形态多样性和分类单元的取样不足，迄今为止岩蕨科属间的系统发育关系仍不清楚。在这项研究中，我们进行了全面的系统发育分析岩蕨科使用的分子证据，从四个叶绿体DNA标记（atpA，matK，rbcL和trnL-F）和覆盖超过一半的目前公认的物种。我们的研究结果表明，岩蕨科有三个主要的分支，分别对应于Physematium（分支I），Cheilanthopsis-Protowoodsia（分支II）和岩蕨s.s.。（进化枝III）。为了保持单系性和分类学的稳定性，提出了一个广义的岩蕨属，包括其他分离子，其特征是独特的indument和inferior indusia。因此，我们提出了一个新的亚属分类的重新定义岩蕨属的系统发育和祖先状态重建的基础上，以更好地反映形态变异，地理分布格局，属的进化历史。我们的细胞学性状进化的分析支持多个非整倍体事件，导致染色体碱基数从41减少到33，37，38，39和40在悬崖蕨类植物的进化历史。
The cliff fern family Woodsiaceae has experienced frequent taxonomic changes at the familial and generic ranks since its establishment. The bulk of its species were placed in Woodsia, while Cheilanthopsis, Hymenocystis, Physematium, and Protowoodsia are segregates recognized by some authors. Phylogenetic relationships among the genera of Woodsiaceae remain unclear because of the extreme morphological diversity and inadequate taxon sampling in phylogenetic studies to date. In this study, we carry out comprehensive phylogenetic analyses of Woodsiaceae using molecular evidence from four chloroplast DNA markers (atpA, matK, rbcL and trnL–F) and covering over half the currently recognized species. Our results show three main clades in Woodsiaceae corresponding to Physematium (clade I), Cheilanthopsis–Protowoodsia (clade II) and Woodsia s.s. (clade III). In the interest of preserving monophyly and taxonomic stability, a broadly defined Woodsia including the other segregates is proposed, which is characterized by the distinctive indument and inferior indusia. Therefore, we present a new subgeneric classification of the redefined Woodsia based on phylogenetic and ancestral state reconstructions to better reflect the morphological variation, geographic distribution pattern, and evolutionary history of the genus. Our analyses of the cytological character evolution support multiple aneuploidy events that have resulted in the reduction of chromosome base number from 41 to 33, 37, 38, 39 and 40 during the evolutionary history of the cliff ferns.