A molecular phylogeny of the early-branching Genistoid lineages of papilionoid legumes reveals a new Amazonian genus segregated from Clathrotropis

IF 2.3 2区 生物学 Q2 PLANT SCIENCES
Bernarda de S Gregório, Catarina S Carvalho, Gustavo Ramos, Lamarck Rocha, Charles H Stirton, Haroldo C de Lima, Charles E Zartman, Gwilym P Lewis, Benjamin M Torke, Cristiane Snak, Heriberto A D Higuita, Luciano P de Queiroz, Domingos Cardoso
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Abstract

Abstract Molecular phylogenetic studies focused on the early-branching papilionoid legumes have revealed many new clades and supported several generic realignments, yet the monophyly of some of the constituent genera has remained unassessed. This is the case for the Amazonian genus Clathrotropis of the tribe Ormosieae. The genus, as traditionally circumscribed, comprises seven species of trees, including some of the most ecologically hyper dominant taxa across the Amazonian terra firme and seasonally flooded forests. Here we employed a Bayesian analysis of densely sampled nuclear ribosomal ITS/5.8S and plastid matK and trnL intron DNA sequences to evaluate the monophyly of Clathrotropis. All individual and concatenated analyses concurred in showing the non-monophyletic nature of Clathrotropis, whose species fall into three distantly related lineages: one, comprised of C. brachypetala, C. brunnea, C. glaucophylla and the ecologically dominant C. macrocarpa, is circumscribed here as the new genus Cabari; the two others, comprising C. paradoxa and the widespread C. nitida, are more closely related to Spirotropis of the tribe Ormosieae. Such phylogeny-based dismemberment of Clathrotropis is further supported by vegetative, floral, fruit, and seed characters. Although the genes analysed in this study have provided phylogenetically informative data supporting the need for a new circumscription of Clathrotropis, we suggest that future phylogenomic studies should seek to better resolve the relationships of the newly described genus Cabari across the phylogenetically recalcitrant early-branching nodes of the Genistoid clade.
一种早期分支的乳突豆科植物Genistoid谱系的分子系统发育揭示了一个新的亚马逊属,从拟羊腿豆科植物分离出来
摘要:对早期分支的类千花豆科植物的分子系统发育研究揭示了许多新的分支,并支持了一些属的重组,但一些组成属的单系性仍未得到评估。这就是亚马逊河流域的蛇蛛属的情况。按照传统的界定,该属由7种树木组成,包括一些在亚马逊陆地上最具生态优势的分类群,包括温带和季节性泛滥的森林。本研究采用贝叶斯分析密集取样的核糖体ITS/5.8S和质体matK和trnL内含子DNA序列来评估拟斜面线虫的单系性。所有的单科和联科分析都一致表明,棘豆属的非单系性,其物种可分为三个远亲系:一个系由短叶棘豆属、褐叶棘豆属、青叶棘豆属和生态优势的大棘豆属组成,在这里被限定为新属Cabari;另外两种,包括C. paradoxa和广泛分布的C. nitida,与ormosiae族的螺旋体虫关系更密切。营养、花、果实和种子的特征进一步支持了这种基于系统发育的分解。尽管本研究中分析的基因提供了系统发育上的信息数据,支持对拟蛛纲进行新的界定的需要,但我们建议未来的系统发育研究应该寻求更好地解决新描述的Cabari属在Genistoid进化枝的系统发育上难以抵抗的早期分支节点之间的关系。
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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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