Evolutionary History of Plants on the Qinghai-Tibetan Plateau

A special issue of Diversity (ISSN 1424-2818). This special issue belongs to the section "Phylogeny and Evolution".

Deadline for manuscript submissions: closed (10 October 2022) | Viewed by 2182

Special Issue Editors

Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China
Interests: botany; genetics; phylogeny; biogeography; evolution

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Guest Editor
School of Life Science, Luoyang Normal University, Luoyang 471022, China
Interests: hybridization; Qinghai-Tibetan Plateau; plastome evolution; molecular phylogenetics; population genetics

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Guest Editor
Department of Biology and Environmental Sciences (IBU), Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany
Interests: population genetics; evolution; phylogenetics; speciation; conservation biology; evolutionary biology; biodiversity; high throughput sequencing

Special Issue Information

Dear Colleagues,

The Qinghai-Tibetan Plateau (QTP) is an important biodiversity hub, which is very sensitive to climate change. Numerous endemic species occur in the QTP and adjacent highlands, which represent centers of the preservation of ancient species and the differentiation of young species. A popular but rarely proven hypothesis is that the uplift of mountains creates environmental conditions (such as dispersed barriers or new habitats) that increase the rate of speciation. Evolutionary history and population genetics studies in the QTP have often revealed that mountain building triggered radiative speciation, resulting in the generation of many endemic species. However, several phylogeographic studies have shown that certain species may have retreated during the ice age to refugia located at the edge of the QTP and recolonized the QTP and the adjacent highlands after the ice age. Meanwhile, some other species also survived in the QTP at high altitudes during the glacial period. For those species, multiple refugia may have remained during the glacial period, some on the QTP, and others on its edge. For every species that has been researched, there is a species-specific feature in their evolutionary histories, even in some closely related species. Therefore, we are organizing this Special Issue of Diversity to explore evolutionary history and population genetic questions to plant endemic species to the QTP and adjacent area.

Dr. Faqi Zhang
Dr. Peng-Cheng Fu
Dr. Gulzar Khan
Guest Editors

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Keywords

  • genetic variation
  • speciation
  • hybridization
  • phylogeny
  • intraspecific divergence
  • endemic species
  • population genetics

Published Papers (1 paper)

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Research

19 pages, 4389 KiB  
Article
Comparative Plastome Analyses of Ephedra przewalskii and E. monosperma (Ephedraceae)
by Shuang Han, Mingze Xia, Jingya Yu, Hao Xu, Yun Han and Faqi Zhang
Diversity 2022, 14(10), 792; https://doi.org/10.3390/d14100792 - 24 Sep 2022
Cited by 1 | Viewed by 1675
Abstract
Ephedra species were erect, branching shrubs found in desert or arid regions worldwide as the source of ephedrine alkaloids. In this study, the complete chloroplast genome of Ephedra przewalskii and E. monosperma on the Qinghai-Tibet Plateau were sequenced, assembled, and annotated. Compared with [...] Read more.
Ephedra species were erect, branching shrubs found in desert or arid regions worldwide as the source of ephedrine alkaloids. In this study, the complete chloroplast genome of Ephedra przewalskii and E. monosperma on the Qinghai-Tibet Plateau were sequenced, assembled, and annotated. Compared with the other four published Ephedra species, the chloroplast genomes of Ephedra species were highly conservative, with a quadripartite structure. The length of the chloroplast genome was 109,569 bp in E. przewalskii with 36.6% GC and 109,604 bp in E. monosperma with 36.6% GC. We detected 118 genes in both Ephedra species, including 73 PCGs, 37 tRNA genes, and eight rRNA genes. Among them, the ndh family genes were lost, which could be used to study the phylogeny and genetic diversity of the genus Ephedra, combined with multiple highly variable intergenic spacer (IGS) regions. Codon usage preference of Ephedra species was weak. The ratio of non-synonymous substitutions and synonymous substitutions was low, showing that the PCGs of Ephedra may be under the pressure of purifying selection. ML and BI analysis showed similar phylogenetic topologies. Ephedra species clustered together in a well-supported monophyletic clade. E. przewalskii and E. monosperma were not gathered in one clade, consistent with the classification system by Flora of China. This study reveals differences in the chloroplast genomes of Ephedra, providing valuable and abundant data for the phylogenetic analysis and species identification of Ephedra. Full article
(This article belongs to the Special Issue Evolutionary History of Plants on the Qinghai-Tibetan Plateau)
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