矮牵牛及相关属(矮牵牛科,茄科)树种不一致的原因是不完全的世系分类和杂交。

IF 3.6 1区 生物学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY Molecular Phylogenetics and Evolution Pub Date : 2024-06-22 DOI:10.1016/j.ympev.2024.108136
Pedro H. Pezzi , Lucas C. Wheeler , Loreta B. Freitas , Stacey D. Smith
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引用次数: 0

摘要

尽管存在物种分化的总体历史,但系统发育研究经常揭示出基因组不同区域的不同拓扑结构。这些基因树不一致的原因多种多样,但不完全系谱分选(ILS)和杂交是其中最具生物学意义的原因。矮牵牛是研究野生杂交的经典系统。虽然野外研究表明杂交很频繁,但牵牛花及其近缘属内部的网状结构程度却从未从系统发育的角度进行过研究。在这项研究中,我们使用了来自 11 个矮牵牛属、16 个萼叶草属和 10 个法比亚娜属的转录组数据来阐明这些物种之间的关系,并研究杂交是否在该支系的多样化过程中发挥了重要作用。我们推断,属内基因树的不一致性与杂交事件有关,同时由于其快速多样化,ILS水平较高。此外,网络分析还估计了矮牵牛属和萼片草属之间更深层次的杂交事件,这两个属的染色体数目不同。虽然这两个属目前还不能杂交,但祖先的杂交可能在它们的平行辐射中起到了一定的作用,因为它们有着相同的栖息地和生活史。
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Incomplete lineage sorting and hybridization underlie tree discordance in Petunia and related genera (Petunieae, Solanaceae)

Despite the overarching history of species divergence, phylogenetic studies often reveal distinct topologies across regions of the genome. The sources of these gene tree discordances are variable, but incomplete lineage sorting (ILS) and hybridization are among those with the most biological importance. Petunia serves as a classic system for studying hybridization in the wild. While field studies suggest that hybridization is frequent, the extent of reticulation within Petunia and its closely related genera has never been examined from a phylogenetic perspective. In this study, we used transcriptomic data from 11 Petunia, 16 Calibrachoa, and 10 Fabiana species to illuminate the relationships between these species and investigate whether hybridization played a significant role in the diversification of the clade. We inferred that gene tree discordance within genera is linked to hybridization events along with high levels of ILS due to their rapid diversification. Moreover, network analyses estimated deeper hybridization events between Petunia and Calibrachoa, genera that have different chromosome numbers. Although these genera cannot hybridize at the present time, ancestral hybridization could have played a role in their parallel radiations, as they share the same habitat and life history.

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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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