Phylogeographic patterns match the floristic subdivisions: The diversification history of a widespread herb in subtropical China.

IF 3.6 2区 生物学 Q1 PLANT SCIENCES
Zhixia Sun, Lihua Yang, Hanghui Kong, Ming Kang, Jing Wang
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引用次数: 0

Abstract

Background and aims: Subtropical China is dominated by evergreen broad-leaved forests (EBLFs) and is acknowledged as a critical region for its high floristic richness and endemism. Understanding of evolutionary mechanisms of such global biodiversity hotspots comes almost exclusively from long-lived tree species. Herbaceous plants represent critical biodiversity components in forests, however, the diversification history of understory herbs in subtropical EBLFs remain poorly understood. Here, we investigated the phylogeographic patterns and demographic history of Oreocharis auricula, a widespread perennial herb endemic to the EBLFs of subtropical China.

Methods: Both cpDNA sequences and single-copy nuclear genes were used to investigate the genetic variation among 657 individuals from 68 populations. Evidences from molecular dating, demographic history construction, and species distribution modeling were also combined to infer the phylogeography and evolutionary history of O. auricula.

Key results: Strong phylogeographic signals have been congruently observed using nuclear and plastid DNA markers, with the diversification patterns generally consistent with the recognized floristic subdivisions of subtropical China. Notably, we revealed an important phylogeographic barrier along the Nanling mountain range, which is also around a climatic transition at 24-26°N latitude in subtropical China, separating the south monsoon subtropical EBLFs from the mid-subtropical EBLFs. Demographic expansion and significant niche divergence were detected among the extant lineages, which may have diverged during the early Pleistocene.

Conclusions: The inherent characteristics of understory herbs with limited dispersal and short generation time intensify the genetic divergence response of O. auricula to abiotic forces, contributing to the profound phylogeographic imprints of mountains and climate in such herbaceous flora. To further substantiate the generality of the identified patterns, it is paramount to extend phylogeographic investigations to other understory herbaceous taxa in subtropical China. These results have expanded our understanding of the diversification processes of subtropical forests in China.

系统地理学模式与植物学分区相匹配:中国亚热带一种广泛分布的草本植物的多样化历史。
背景和目的:中国亚热带地区以常绿阔叶林(EBLFs)为主,因其丰富的植物多样性和特有性而被认为是一个重要地区。对此类全球生物多样性热点地区进化机制的了解几乎完全来自长寿树种。草本植物是森林生物多样性的重要组成部分,然而,人们对亚热带EBLFs林下草本植物的多样化历史仍然知之甚少。在此,我们研究了中国亚热带EBLF特有的多年生草本植物Oreocharis auricula的系统地理格局和人口历史:方法:利用cpDNA序列和单拷贝核基因研究了68个种群657个个体的遗传变异。方法:利用 cpDNA 序列和单拷贝核基因研究了 68 个种群 657 个个体的遗传变异,并结合分子年代学、人口历史构建和物种分布建模等证据,推断了 O. auricula 的系统地理学和进化历史:主要结果:利用核DNA和质粒DNA标记物观察到了强烈的系统地理学信号,其多样化模式与公认的中国亚热带植物学分区基本一致。值得注意的是,我们揭示了沿南岭山脉的一个重要系统地理屏障,该屏障也位于中国亚热带北纬24-26°的气候过渡带附近,将南季风亚热带EBLF与中亚热带EBLF分隔开来。在现存世系中发现了人口扩张和显著的生态位分化,这些世系可能是在更新世早期分化的:结论:林下草本植物的固有特点是传播有限且世代较短,这加剧了O. auricula的遗传分化对非生物力量的反应,从而使山脉和气候在这类草本植物群中留下了深刻的系统地理印记。为了进一步证实所发现模式的普遍性,必须将系统地理学研究扩展到中国亚热带的其他林下草本类群。这些结果拓展了我们对中国亚热带森林多样性过程的认识。
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来源期刊
Annals of botany
Annals of botany 生物-植物科学
CiteScore
7.90
自引率
4.80%
发文量
138
审稿时长
3 months
期刊介绍: Annals of Botany is an international plant science journal publishing novel and rigorous research in all areas of plant science. It is published monthly in both electronic and printed forms with at least two extra issues each year that focus on a particular theme in plant biology. The Journal is managed by the Annals of Botany Company, a not-for-profit educational charity established to promote plant science worldwide. The Journal publishes original research papers, invited and submitted review articles, ''Research in Context'' expanding on original work, ''Botanical Briefings'' as short overviews of important topics, and ''Viewpoints'' giving opinions. All papers in each issue are summarized briefly in Content Snapshots , there are topical news items in the Plant Cuttings section and Book Reviews . A rigorous review process ensures that readers are exposed to genuine and novel advances across a wide spectrum of botanical knowledge. All papers aim to advance knowledge and make a difference to our understanding of plant science.
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