Rapid Divergence Followed by Adaptation to Contrasting Ecological Niches of Two Closely Related Columbine Species Aquilegia japonica and A. oxysepala

Li, Ming-Rui; Wang, Hua-Ying; Ding, Ning; Lu, Tianyuan; Huang, Ye-Chao; Xiao, Hong-Xing; Liu, Bao; Li, Lin-Feng

doi:10.1093/gbe/evz038

Title: Rapid Divergence Followed by Adaptation to Contrasting Ecological Niches of Two Closely Related Columbine Species Aquilegia japonica and A. oxysepala

Journal Article · Thu Feb 21 00:00:00 EST 2019 · Genome Biology and Evolution

DOI:https://doi.org/10.1093/gbe/evz038· OSTI ID:1625345

Li, Ming-Rui ^[1]; Wang, Hua-Ying ^[2]; Ding, Ning ^[1];

^[3]; Huang, Ye-Chao ^[1]; Xiao, Hong-Xing ^[2]; Liu, Bao ^[2];

^[1]

Fudan Univ., Shanghai (China)
Northeast Normal University, Changchun (China)
McGill University and Genome Quebec Innovation Center, Montreal, QC (Canada)

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.

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Research Organization:: USDOE Joint Genome Institute (JGI), Berkeley, CA (United States)

Sponsoring Organization:: USDOE; National Natural Science Foundation of China (NSFC); Fudan University

Grant/Contract Number:: 31670382; JIH1322105

OSTI ID:: 1625345

Journal Information:: Genome Biology and Evolution, Vol. 11, Issue 3; ISSN 1759-6653

Publisher:: Society for Molecular Biology and EvolutionCopyright Statement

Country of Publication:: United States

Language:: English

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