草叶草亚群的分子系统发育。莎草科的莎草揭示了传统剖面的人工安排

IF 2.3 2区 生物学 Q2 PLANT SCIENCES
Fernando S Cabral, Duane F Lima, Magdalena Vaio, Pedro Fiaschi
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引用次数: 0

摘要

摘要草叶草亚属;Thamnoxys是一个主要分布在南美洲的Oxalis类群,包括来自热带栖息地的近80种,目前根据形态和地理分布分为9个部分。在本研究中,我们研究了草叶草亚属(Oxalis subg。thamoxys及其切片是单系的。92份禾草标本(55份来自O. subg.) nrITS、trnL-trnL-trnF和petA-psbJ的DNA序列分析。thamoxys, 37来自O. subg。以禾草属(Oxalis)和5个外群类群为研究对象,探讨了其9个类群间的系统发育关系。核和质体分子标记分别进行了最大似然和贝叶斯推理分析,并在组合数据矩阵中进行了分析。我们的系统发育树恢复了O. subg。只有当先前包括在O. Robustae节中的O. praetexta被转移到O. subg时,thamoxys才具有单系性。酢浆草。亚属的剩余样本出现在一个分支中,具有充分的引导和后验概率支持。其中,Holophyllum是唯一被恢复为单系的部分,而其余部分则不是,要么是由于每个部分都采集了一个物种(O. sect. Foliosae, Hedysaroideae和Phyllodoxys),要么是由于O. goyazensis (O. sect. Robustae)意外地位于O. sect. Psoraleoideae中,要么是由于O. densifolia (O. sect. Foliosae)与O. pyrenea var. macrochaeta (O. sect. Thamnoxys)之间的姐妹关系。建议需要重新评估一些特定的亲和力和更新分区界限。本系统发育研究与改进抽样O. subg。Thamnoxys是对该亚属进行更新分类的第一步,也是解释其形态多样化和南美洲生物地理历史的第一步。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Molecular phylogenetics of Oxalis subg. Thamnoxys (Oxalidaceae) reveals artificial arrangements of traditional sections
Abstract Oxalis subg. Thamnoxys is a mostly South American group of Oxalis encompassing almost 80 species from tropical habitats that are currently separated into nine sections based on morphology and geographic distributions. In this study, we investigated whether Oxalis subg. Thamnoxys and its sections are monophyletic. DNA sequences of the nrITS, trnL-trnL-trnF, and petA-psbJ from 92 specimens of Oxalis (55 from O. subg. Thamnoxys, 37 from O. subg. Oxalis, and five outgroup taxa) were used to investigate phylogenetic relationships among its nine sections. Nuclear and plastid molecular markers were subjected to maximum likelihood and Bayesian inference analyses individually and in a combined data matrix. Our phylogenetic trees recovered O. subg. Thamnoxys as monophyletic only if O. praetexta, previously included in O. sect. Robustae, is transferred to O. subg. Oxalis. The remaining samples of the subgenus emerged in a clade with full bootstrap and posterior probability support. Within it, O. sect. Holophyllum was the only section that was recovered as monophyletic, whereas the remaining sections were not, either because of sampling a single species of each (O. sect. Foliosae, Hedysaroideae, and Phyllodoxys), to the unexpected placement of O. goyazensis (O. sect. Robustae) in O. sect. Psoraleoideae, or to the sister relationship between O. densifolia (O. sect. Foliosae) with O. pyrenea var. macrochaeta (O. sect. Thamnoxys), suggesting the need of revaluating some specific affinities and updating sectional circumscriptions. This phylogenetic study with an improved sampling of O. subg. Thamnoxys is the first step towards an updated classification of the subgenus and for interpreting both its morphological diversification and biogeographic history in South America.
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来源期刊
CiteScore
5.70
自引率
8.30%
发文量
54
审稿时长
3.5 months
期刊介绍: The Botanical Journal of the Linnean Society publishes original papers on systematic and evolutionary botany and comparative studies of both living and fossil plants. Review papers are also welcomed which integrate fields such as cytology, morphogenesis, palynology and phytochemistry into a taxonomic framework. The Journal will only publish new taxa in exceptional circumstances or as part of larger monographic or phylogenetic revisions.
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