Rapid Divergence Followed by Adaptation to Contrasting Ecological Niches of Two Closely Related Columbine Species Aquilegia japonica and A. oxysepala
Abstract
Elucidating the mechanisms underlying the genetic divergence between closely related species is crucial to understanding the origin and evolution of biodiversity. The genus Aquilegia L. has undergone rapid adaptive radiation, generating about 70 well-recognized species that are specialized to distinct habitats and pollinators. In this study, to address the underlying evolutionary mechanisms that drive the genetic divergence, we analyzed the whole genomes of two ecologically isolated Aquilegia species, A. oxysepala and A. japonica as well as their putative hybrid. Our comparative genomic analyses reveal that while the two species diverged only recently and experienced recurrent gene flow, a high level of genetic divergence is observed in their nuclear genomes. In particular, candidate genomic regions that show signature of selection differ dramatically between the two species. Given that the splitting time of the two species is broadly matched with the decrease in effective population sizes, we propose that allopatric isolation together with natural selection have preceded the interspecific gene flow in the process of speciation. The observed high genetic divergence is likely an outcome of combined effects of natural selection, genetic drift and divergent sorting of ancestral polymorphisms. Our study provides a genome-wide view of how genetic divergence has evolved betweenmore »
- Authors:
-
[3];
[1]
- Fudan Univ., Shanghai (China)
- Northeast Normal University, Changchun (China)
- McGill University and Genome Quebec Innovation Center, Montreal, QC (Canada)
- Publication Date:
- Research Org.:
- USDOE Joint Genome Institute (JGI), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE; National Natural Science Foundation of China (NSFC); Fudan University
- OSTI Identifier:
- 1625345
- Grant/Contract Number:
- 31670382; JIH1322105
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Genome Biology and Evolution
- Additional Journal Information:
- Journal Volume: 11; Journal Issue: 3; Journal ID: ISSN 1759-6653
- Publisher:
- Society for Molecular Biology and Evolution
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; evolutionary biology; genetics & heredity; Aquilegia; adaptation; ecological specialization; selection; speciation
Citation Formats
Li, Ming-Rui, Wang, Hua-Ying, Ding, Ning, Lu, Tianyuan, Huang, Ye-Chao, Xiao, Hong-Xing, Liu, Bao, and Li, Lin-Feng. Rapid Divergence Followed by Adaptation to Contrasting Ecological Niches of Two Closely Related Columbine Species Aquilegia japonica and A. oxysepala. United States: N. p., 2019.
Web. doi:10.1093/gbe/evz038.
Li, Ming-Rui, Wang, Hua-Ying, Ding, Ning, Lu, Tianyuan, Huang, Ye-Chao, Xiao, Hong-Xing, Liu, Bao, & Li, Lin-Feng. Rapid Divergence Followed by Adaptation to Contrasting Ecological Niches of Two Closely Related Columbine Species Aquilegia japonica and A. oxysepala. United States. https://doi.org/10.1093/gbe/evz038
Li, Ming-Rui, Wang, Hua-Ying, Ding, Ning, Lu, Tianyuan, Huang, Ye-Chao, Xiao, Hong-Xing, Liu, Bao, and Li, Lin-Feng. Thu .
"Rapid Divergence Followed by Adaptation to Contrasting Ecological Niches of Two Closely Related Columbine Species Aquilegia japonica and A. oxysepala". United States. https://doi.org/10.1093/gbe/evz038. https://www.osti.gov/servlets/purl/1625345.
@article{osti_1625345,
title = {Rapid Divergence Followed by Adaptation to Contrasting Ecological Niches of Two Closely Related Columbine Species Aquilegia japonica and A. oxysepala},
author = {Li, Ming-Rui and Wang, Hua-Ying and Ding, Ning and Lu, Tianyuan and Huang, Ye-Chao and Xiao, Hong-Xing and Liu, Bao and Li, Lin-Feng},
abstractNote = {Elucidating the mechanisms underlying the genetic divergence between closely related species is crucial to understanding the origin and evolution of biodiversity. The genus Aquilegia L. has undergone rapid adaptive radiation, generating about 70 well-recognized species that are specialized to distinct habitats and pollinators. In this study, to address the underlying evolutionary mechanisms that drive the genetic divergence, we analyzed the whole genomes of two ecologically isolated Aquilegia species, A. oxysepala and A. japonica as well as their putative hybrid. Our comparative genomic analyses reveal that while the two species diverged only recently and experienced recurrent gene flow, a high level of genetic divergence is observed in their nuclear genomes. In particular, candidate genomic regions that show signature of selection differ dramatically between the two species. Given that the splitting time of the two species is broadly matched with the decrease in effective population sizes, we propose that allopatric isolation together with natural selection have preceded the interspecific gene flow in the process of speciation. The observed high genetic divergence is likely an outcome of combined effects of natural selection, genetic drift and divergent sorting of ancestral polymorphisms. Our study provides a genome-wide view of how genetic divergence has evolved between closely related species.},
doi = {10.1093/gbe/evz038},
journal = {Genome Biology and Evolution},
number = 3,
volume = 11,
place = {United States},
year = {Thu Feb 21 00:00:00 EST 2019},
month = {Thu Feb 21 00:00:00 EST 2019}
}
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