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Population Genomics Reveals Demographic History and Genomic Differentiation of Populus davidiana and Populus tremula

Forest trees can increase our understanding of how evolutionary processes drive the genomic landscape and understand speciation due to the majority of forest trees being distributed widely and able to adapt to different climates and environments. Populus davidiana and Populus tremula are among the m...

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Autores principales: Hou, Zhe, Li, Ang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7396531/
https://www.ncbi.nlm.nih.gov/pubmed/32849683
http://dx.doi.org/10.3389/fpls.2020.01103
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author Hou, Zhe
Li, Ang
author_facet Hou, Zhe
Li, Ang
author_sort Hou, Zhe
collection PubMed
description Forest trees can increase our understanding of how evolutionary processes drive the genomic landscape and understand speciation due to the majority of forest trees being distributed widely and able to adapt to different climates and environments. Populus davidiana and Populus tremula are among the most geographically widespread and ecologically important tree species in Northern Hemisphere. Whole-genome resequencing data of 41 individuals of P. davidiana and P. tremula throughout Eurasia was conducted, finding that genetic differentiation was evident between the two species, the F(ST) values between P. davidiana and P. tremula was 0.3625. The ancestors of the two aspen diverged into P. davidiana and P. tremula species approximately 3.60 million years ago (Mya), which was in accordance with the rapid uplift of Qinghai–Tibet Plateau (QTP) around the Miocene/Pliocene boundary. The two species experienced a considerable long-term bottleneck after divergence, with population expansion beginning approximately 20,000 years ago after the end of the last glacial maximum. Although the majority of regions of genomic differentiation between the two species can be explained by neutral evolutionary processes, some outlier regions have also been tested that are significantly influenced by natural selection. We found that the highly differentiated regions of the two species exhibited significant positive selection characteristics, and also identified long-term balancing selection in the poorly differentiated regions in both species. Our results provide strong support for a role of linked selection in generating the heterogeneous genomic landscape of differentiation between P. davidiana and P. tremula. These results provide the detailed and comprehensive genomic insights into genetic diversity, demography, genetic burden, and adaptation in P. davidiana and P. tremula.
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spelling pubmed-73965312020-08-25 Population Genomics Reveals Demographic History and Genomic Differentiation of Populus davidiana and Populus tremula Hou, Zhe Li, Ang Front Plant Sci Plant Science Forest trees can increase our understanding of how evolutionary processes drive the genomic landscape and understand speciation due to the majority of forest trees being distributed widely and able to adapt to different climates and environments. Populus davidiana and Populus tremula are among the most geographically widespread and ecologically important tree species in Northern Hemisphere. Whole-genome resequencing data of 41 individuals of P. davidiana and P. tremula throughout Eurasia was conducted, finding that genetic differentiation was evident between the two species, the F(ST) values between P. davidiana and P. tremula was 0.3625. The ancestors of the two aspen diverged into P. davidiana and P. tremula species approximately 3.60 million years ago (Mya), which was in accordance with the rapid uplift of Qinghai–Tibet Plateau (QTP) around the Miocene/Pliocene boundary. The two species experienced a considerable long-term bottleneck after divergence, with population expansion beginning approximately 20,000 years ago after the end of the last glacial maximum. Although the majority of regions of genomic differentiation between the two species can be explained by neutral evolutionary processes, some outlier regions have also been tested that are significantly influenced by natural selection. We found that the highly differentiated regions of the two species exhibited significant positive selection characteristics, and also identified long-term balancing selection in the poorly differentiated regions in both species. Our results provide strong support for a role of linked selection in generating the heterogeneous genomic landscape of differentiation between P. davidiana and P. tremula. These results provide the detailed and comprehensive genomic insights into genetic diversity, demography, genetic burden, and adaptation in P. davidiana and P. tremula. Frontiers Media S.A. 2020-07-22 /pmc/articles/PMC7396531/ /pubmed/32849683 http://dx.doi.org/10.3389/fpls.2020.01103 Text en Copyright © 2020 Hou and Li http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Plant Science
Hou, Zhe
Li, Ang
Population Genomics Reveals Demographic History and Genomic Differentiation of Populus davidiana and Populus tremula
title Population Genomics Reveals Demographic History and Genomic Differentiation of Populus davidiana and Populus tremula
title_full Population Genomics Reveals Demographic History and Genomic Differentiation of Populus davidiana and Populus tremula
title_fullStr Population Genomics Reveals Demographic History and Genomic Differentiation of Populus davidiana and Populus tremula
title_full_unstemmed Population Genomics Reveals Demographic History and Genomic Differentiation of Populus davidiana and Populus tremula
title_short Population Genomics Reveals Demographic History and Genomic Differentiation of Populus davidiana and Populus tremula
title_sort population genomics reveals demographic history and genomic differentiation of populus davidiana and populus tremula
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7396531/
https://www.ncbi.nlm.nih.gov/pubmed/32849683
http://dx.doi.org/10.3389/fpls.2020.01103
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