Phylogenomic insights into the historical biogeography, character-state evolution, and species diversification rates of Cypripedioideae (Orchidaceae)

IF 3.6 1区 生物学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY Molecular Phylogenetics and Evolution Pub Date : 2024-07-06 DOI:10.1016/j.ympev.2024.108138
Min Liao , Jun-Yi Zhang , Yu Feng , Zong-Xin Ren , Heng-Ning Deng , Bo Xu
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Abstract

Cypripedioideae (slipper orchids; Orchidaceae) currently consist of ∼200 herbaceous species with a strikingly disjunctive distribution in tropical and temperate regions of both hemispheres. In this study, an updated phylogeny with representatives from all five cypripedioid genera was presented based on maximum likelihood and Bayesian inference of plastome and low-copy nuclear genes. Phylogenomic analyses indicated that each genus is monophyletic, but some relationships (e.g., those among Cypripedium sects. Acaulia, Arietinum, Bifolia, Flabellinervia, Obtusipetala and Palangshanensia) conflict with those in previous studies based on Sanger data. Cypripedioideae appeared to have arisen in South America and/or the adjacent Qinghai-Tibet Plateau and Hengduan Mountains ∼35 Mya. We inferred multiple dispersal events between East Asia and North America in Cypripedium, and between mainland Southeast Asia and the Malay Archipelago in Paphiopedilum. In the Americas, divergences among four genera (except Cypripedium) occurred around 31–20 Mya, long before the closure of the Isthmus of Panama, indicating the importance of long-distance dispersal. Evolutionary patterns between morphological and plastome character evolution suggested several traits, genome size and NDH genes, which are likely to have contributed to the success of slipper orchids in alpine floras and low-elevation forests. Species diversification rates were notably higher in epiphytic clades of Paphiopedilum than in other, terrestrial cypripedioids, paralleling similar accelerations associated with epiphytism in other groups. This study also suggested that sea-level fluctuations and mountain-building processes promoted the diversification of the largest genera, Paphiopedilum and Cypripedium.

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通过系统发生组学深入了解兰科(Cypripedioideae)植物的历史生物地理学、特征进化和物种多样化率。
拖鞋兰科(Cypripedioideae;Orchidaceae)目前有 200 多个草本物种,分布在两个半球的热带和温带地区,具有明显的不连续性。本研究根据质体基因和低拷贝核基因的最大似然法和贝叶斯推断法,提出了一个最新的系统发生图,其中包括所有五个蝶形花属的代表物种。系统发生组分析表明,每个属都是单系的,但有些关系(如 Cypripedium sects.Acaulia、Arietinum、Bifolia、Flabellinervia、Obtusipetala 和 Palangshanensia)与之前基于 Sanger 数据的研究结果相冲突。Cypripedioideae似乎起源于南美洲和/或邻近的青藏高原和横断山脉∼35 Mya。我们推断Cypripedium在东亚和北美之间、Paphiopedilum在东南亚大陆和马来群岛之间有多次扩散事件。在美洲,4个属之间的分化发生在31-20万年左右,远远早于巴拿马地峡的关闭,这表明了远距离扩散的重要性。形态和质体特征之间的进化模式表明,基因组大小和NDH基因等几种性状很可能有助于拖鞋兰在高山植物区系和低海拔森林中取得成功。木犀草属附生支系的物种多样化率明显高于其他陆生蝶形花科植物,这与其他类群中与附生相关的类似加速现象类似。这项研究还表明,海平面波动和造山运动促进了最大的属--木槿属和芹菜属--的多样化。
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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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