Phylogenomic analyses revealed widely occurring hybridization events across Elsholtzieae (Lamiaceae)

IF 3.6 1区 生物学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY
Yan Wang , Xuexue Wu , Yanyi Chen , Chao Xu , Yinghui Wang , Qiang Wang
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引用次数: 0

Abstract

Obtaining a robust phylogeny proves challenging due to the intricate evolutionary history of species, where processes such as hybridization and incomplete lineage sorting can introduce conflicting signals, thereby complicating phylogenetic inference. In this study, we conducted comprehensive sampling of Elsholtzieae, with a particular focus on its largest genus, Elsholtzia. We utilized 503 nuclear loci and complete plastome sequences obtained from 99 whole-genome sequencing datasets to elucidate the interspecific relationships within the Elsholtzieae. Additionally, we explored various sources of conflicts between gene trees and species trees. Fully supported backbone phylogenies were recovered, and the monophyly of Elsholtzia and Keiskea was not supported. Significant gene tree heterogeneity was observed at numerous nodes, particularly regarding the placement of Vuhuangia and the E. densa clade. Further investigations into potential causes of this discordance revealed that incomplete lineage sorting (ILS), coupled with hybridization events, has given rise to substantial gene tree discordance. Several species, represented by multiple samples, exhibited a closer association with geographical distribution rather than following a strictly monophyletic pattern in plastid trees, suggesting chloroplast capture within Elsholtzieae and providing evidence of hybridization. In conclusion, this study provides phylogenomic insights to untangle taxonomic problems in the tribe Elsholtzieae, especially the genus Elsholtzia.

系统发生组分析表明,Elsholtzieae(苎麻科)中广泛发生杂交事件。
由于物种的进化历史错综复杂,杂交和不完全世系分类等过程可能会带来相互矛盾的信号,从而使系统发育推断复杂化,因此获得稳健的系统发育具有挑战性。在本研究中,我们对 Elsholtzieae 进行了全面采样,尤其关注其最大的属 Elsholtzia。我们利用从 99 个全基因组测序数据集中获得的 503 个核基因位点和完整的质粒体序列来阐明 Elsholtzieae 的种间关系。此外,我们还探讨了基因树与物种树之间冲突的各种来源。我们恢复了完全支持的骨干系统发生,并否定了 Elsholtzia 和 Keiskea 的单系性。在许多节点上观察到了明显的基因树异质性,尤其是在 Vuhuangia 和 E. densa 支系的位置上。对造成这种不一致性的潜在原因的进一步研究表明,不完全的世系分类(ILS),加上古代和近期的杂交事件,造成了基因树的严重不一致性。由多个样本代表的几个物种表现出与地理分布更密切的联系,而不是在质体树中遵循严格的单系模式,这表明在 Elsholtzieae 中叶绿体的捕获量很大,并提供了杂交的证据。总之,本研究为解开 Elsholtzieae 族,尤其是 Elsholtzia 属的分类问题提供了系统发生学的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Molecular Phylogenetics and Evolution
Molecular Phylogenetics and Evolution 生物-进化生物学
CiteScore
7.50
自引率
7.30%
发文量
249
审稿时长
7.5 months
期刊介绍: Molecular Phylogenetics and Evolution is dedicated to bringing Darwin''s dream within grasp - to "have fairly true genealogical trees of each great kingdom of Nature." The journal provides a forum for molecular studies that advance our understanding of phylogeny and evolution, further the development of phylogenetically more accurate taxonomic classifications, and ultimately bring a unified classification for all the ramifying lines of life. Phylogeographic studies will be considered for publication if they offer EXCEPTIONAL theoretical or empirical advances.
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