Climatic Refugia and Geographical Isolation Contribute to the Speciation and Genetic Divergence in Himalayan-Hengduan Tree Peonies (Paeonia delavayi and Paeonia ludlowii)

doi:10.3389/fgene.2020.595334

KIB OpenIR

	Climatic Refugia and Geographical Isolation Contribute to the Speciation and Genetic Divergence in Himalayan-Hengduan Tree Peonies (Paeonia delavayi and Paeonia ludlowii)
	Zhao,Yu-Juan ; Yin,Gen-Shen ; Pan,Yue-Zhi ; Tian,Bo ; Gong,Xun
	2021
Source Publication	FRONTIERS IN GENETICS
ISSN	1664-8021
Volume	11 Pages:595334
Abstract	Himalaya and Hengduan Mountains (HHM) is a biodiversity hotspot, and very rich in endemic species. Previous phylogeographical studies proposed different hypotheses (vicariance and climate-driven speciation) in explaining diversification and the observed pattern of extant biodiversity, but it is likely that taxa are forming in this area in species-specific ways. Here, we reexplored the phylogenetic relationship and tested the corresponding hypotheses within Paeonia subsect. Delavayanae composed of one widespread species (Paeonia delavayi) and the other geographically confined species (Paeonia ludlowii). We gathered genetic variation data at three chloroplast DNA fragments and one nuclear gene from 335 individuals of 34 populations sampled from HHM. We performed a combination of population genetic summary statistics, isolation-with-migration divergence models, isolation by environment, and demographic history analyses. We found evidence for the current taxonomic treatment that P. ludlowii and P. delavayi are two different species with significant genetic differentiation. The significant isolation by environment was revealed within all sampled populations but genetic distances only explained by geographical distances within P. delavayi populations. The results of population divergence models and demographic history analyses indicated a progenitor-derivative relationship and the Late Quaternary divergence without gene flow between them. The coalescence of all sampled cpDNA haplotypes could date to the Late Miocene, and P. delavayi populations probably underwent a severe bottleneck in population size during the last glacial period. Genetic variation in Paeonia subsect. Delavayanae is associated with geographical and environmental distances. These findings point to the importance of geological and climatic changes as causes of the speciation event and lineage diversification within Paeonia subsect. Delavayanae.
Keyword	climate change Himalaya-Hengduan Mountains Paeonia Pleistocene refugia speciation EVOLUTIONARY HISTORY SPECIES DELIMITATION POPULATION-GENETICS PLANT DIVERSITY PHYLOGEOGRAPHY CHLOROPLAST MOUNTAINS INFERENCE SOFTWARE DIVERSIFICATION
DOI	10.3389/fgene.2020.595334
WOS ID	WOS:000616635500001
Citation statistics
Document Type	期刊论文
Identifier	http://ir.kib.ac.cn/handle/151853/73669
Collection	中国科学院昆明植物研究所
Affiliation	1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers & Biogeog East Asia, Kunming, Yunnan, Peoples R China 2.Chinese Acad Sci, Kunming Inst Bot, Key Lab Econ Plants & Biotechnol, Kunming, Yunnan, Peoples R China 3.Kunming Univ, Chinese Acad Sci CAS, Coll Agr & Life Sci, Kunming, Yunnan, Peoples R China 4.Chinese Acad Sci, Key Lab Trop Plant Resource & Sustainable Use, Xishuangbanna Trop Bot Garden, Mengla, Peoples R China
Recommended Citation GB/T 7714	Zhao,Yu-Juan,Yin,Gen-Shen,Pan,Yue-Zhi,et al. Climatic Refugia and Geographical Isolation Contribute to the Speciation and Genetic Divergence in Himalayan-Hengduan Tree Peonies (Paeonia delavayi and Paeonia ludlowii)[J]. FRONTIERS IN GENETICS,2021,11:595334.
APA	Zhao,Yu-Juan,Yin,Gen-Shen,Pan,Yue-Zhi,Tian,Bo,&Gong,Xun.(2021).Climatic Refugia and Geographical Isolation Contribute to the Speciation and Genetic Divergence in Himalayan-Hengduan Tree Peonies (Paeonia delavayi and Paeonia ludlowii).FRONTIERS IN GENETICS,11,595334.
MLA	Zhao,Yu-Juan,et al."Climatic Refugia and Geographical Isolation Contribute to the Speciation and Genetic Divergence in Himalayan-Hengduan Tree Peonies (Paeonia delavayi and Paeonia ludlowii)".FRONTIERS IN GENETICS 11(2021):595334.

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