Phylogeny of the Chinese Endemic Fern Genus Neocheiropteris (Polypodiaceae)

doi:10.3724/SP.J.1143.2011.10188

Abstract

Abstract:

Neocheiropteris is one of the four Chinese endemic fern genera. The taxonomic circumscription and systematic position of Neocheiropteris have always been argued among taxonomists since its establishment by Christ in 1905. The anatomical examination of Neocheiropteris and Neolepisorus is performed, and four chloroplast DNA markers: rbcL, rpS4 & rpS4-trnS IGS, trnL intron & trnL-trnF IGS and atpB & atpB-rbcL IGS for Neocheiropteris and its closely related taxa, totally 14 taxa are sequenced. Phylogenetic trees are constructed with the Maximum-parsimony, Maximum-likelihood and Bayesian inference method based on coded dataset/non-coded dataset/combined dataset. The division of Neocheiropteris and Neolepisorus is supported by both anatomical and molecular phylogeny evidence. Anatomical research provides support for the division of the two genera by their totally different characters of the division back and vein of frond, and for the close connection of the two genera by their common characters of rhizome scale. Molecular phylogeny research shows that: Neocheiropteris is sister to a clade that includes Tricholepidium and Lepidomicrosorium, and Neolepisorus is sister to the combination of above-mentioned three genera. The taxonomic circumscription and systematic position of Neocheiropteris are investigated by integrating anatomical characters and molecular phylogenetic results, only Neocheiropteris palmatopedata and N.triglossa should be treated as members of Neo-cheiropteris. The systematic position of N.triglossa is investigated based on molecular together with anatomical evidence for the first time.

Key words: Neocheiropteris, Phylogeny, Anatomy, Chloroplast DNA sequences

摘要：

扇蕨属(Neocheiropteris)为中国蕨类植物4个特有属之一。自Christ建属以来，不同的分类学者对本属的范畴以及系统位置一直存有争议。本研究对扇蕨属和盾蕨属进行了形态解剖观察，并对扇蕨属及其近缘类群共14个种的4个叶绿体DNA片段：rbcL、rpS4 & rpS4-trnS IGS、trnL intron & trnL-trnF IGS以及atpB & atpB-rbcL IGS进行测序，应用最大简约法（Maximum-parsimony）、最大似然法（Maximum-likelihood）和贝叶斯推断（Bayesian inference）对序列进行联合矩阵分析，并构建系统树。该研究从形态学和分子系统学方面都提出了支持扇蕨属和盾蕨属分立的证据。形态学研究显示扇蕨属和盾蕨属叶片分裂方式、叶被和侧脉特征迥异，支持扇蕨属和盾蕨属的分立；但两属根状茎鳞片的共同特征则反映了两属间的紧密联系。分子系统学研究表明扇蕨属与毛鳞蕨属和鳞果星蕨属构成姐妹群，其集合与盾蕨属构成姐妹群。综合形态学和分子系统学的证据，对扇蕨属的系统位置以及范畴进行了深入探讨，扇蕨属包括扇蕨和三出扇蕨，结合形态学和分子系统学证据对三出扇蕨的系统位置进行了初步探讨。

关键词: 扇蕨属, 系统学, 形态解剖, 叶绿体DNA序列

CLC Number:

Q 949.36

DU Xin-Yu- , CHENG Xiao. Phylogeny of the Chinese Endemic Fern Genus Neocheiropteris (Polypodiaceae)[J]. Plant Diversity, 2011, 33(3): 261-268.

杜新宇1、2 , 成晓1. 中国特有蕨属扇蕨属(水龙骨科)的系统学研究[J]. Plant Diversity, 2011, 33(3): 261-268.

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