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Demography and selection analysis of the incipient adaptive radiation of a Hawaiian woody species
Ecological divergence in a species provides a valuable opportunity to study the early stages of speciation. We focused on Metrosideros polymorpha, a unique example of the incipient radiation of woody species, to examine how an ecological divergence continues in the face of gene flow. We analyzed the...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Public Library of Science
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8782371/ https://www.ncbi.nlm.nih.gov/pubmed/35061669 http://dx.doi.org/10.1371/journal.pgen.1009987 |
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author | Izuno, Ayako Onoda, Yusuke Amada, Gaku Kobayashi, Keito Mukai, Mana Isagi, Yuji Shimizu, Kentaro K. |
author_facet | Izuno, Ayako Onoda, Yusuke Amada, Gaku Kobayashi, Keito Mukai, Mana Isagi, Yuji Shimizu, Kentaro K. |
author_sort | Izuno, Ayako |
collection | PubMed |
description | Ecological divergence in a species provides a valuable opportunity to study the early stages of speciation. We focused on Metrosideros polymorpha, a unique example of the incipient radiation of woody species, to examine how an ecological divergence continues in the face of gene flow. We analyzed the whole genomes of 70 plants collected throughout the island of Hawaii, which is the youngest island with the highest altitude in the archipelago and encompasses a wide range of environments. The continuous M. polymorpha forest stands on the island of Hawaii were differentiated into three genetic clusters, each of which grows in a distinctive environment and includes substantial genetic and phenotypic diversity. The three genetic clusters showed signatures of selection in genomic regions encompassing genes relevant to environmental adaptations, including genes associated with light utilization, oxidative stress, and leaf senescence, which are likely associated with the ecological differentiation of the species. Our demographic modeling suggested that the glaberrima cluster in wet environments maintained a relatively large population size and two clusters split: polymorpha in the subalpine zone and incana in dry and hot conditions. This ecological divergence possibly began before the species colonized the island of Hawaii. Interestingly, the three clusters recovered genetic connectivity coincidentally with a recent population bottleneck, in line with the weak reproductive isolation observed in the species. This study highlights that the degree of genetic differentiation between ecologically-diverged populations can vary depending on the strength of natural selection in the very early phases of speciation. |
format | Online Article Text |
id | pubmed-8782371 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-87823712022-01-22 Demography and selection analysis of the incipient adaptive radiation of a Hawaiian woody species Izuno, Ayako Onoda, Yusuke Amada, Gaku Kobayashi, Keito Mukai, Mana Isagi, Yuji Shimizu, Kentaro K. PLoS Genet Research Article Ecological divergence in a species provides a valuable opportunity to study the early stages of speciation. We focused on Metrosideros polymorpha, a unique example of the incipient radiation of woody species, to examine how an ecological divergence continues in the face of gene flow. We analyzed the whole genomes of 70 plants collected throughout the island of Hawaii, which is the youngest island with the highest altitude in the archipelago and encompasses a wide range of environments. The continuous M. polymorpha forest stands on the island of Hawaii were differentiated into three genetic clusters, each of which grows in a distinctive environment and includes substantial genetic and phenotypic diversity. The three genetic clusters showed signatures of selection in genomic regions encompassing genes relevant to environmental adaptations, including genes associated with light utilization, oxidative stress, and leaf senescence, which are likely associated with the ecological differentiation of the species. Our demographic modeling suggested that the glaberrima cluster in wet environments maintained a relatively large population size and two clusters split: polymorpha in the subalpine zone and incana in dry and hot conditions. This ecological divergence possibly began before the species colonized the island of Hawaii. Interestingly, the three clusters recovered genetic connectivity coincidentally with a recent population bottleneck, in line with the weak reproductive isolation observed in the species. This study highlights that the degree of genetic differentiation between ecologically-diverged populations can vary depending on the strength of natural selection in the very early phases of speciation. Public Library of Science 2022-01-21 /pmc/articles/PMC8782371/ /pubmed/35061669 http://dx.doi.org/10.1371/journal.pgen.1009987 Text en © 2022 Izuno et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Izuno, Ayako Onoda, Yusuke Amada, Gaku Kobayashi, Keito Mukai, Mana Isagi, Yuji Shimizu, Kentaro K. Demography and selection analysis of the incipient adaptive radiation of a Hawaiian woody species |
title | Demography and selection analysis of the incipient adaptive radiation of a Hawaiian woody species |
title_full | Demography and selection analysis of the incipient adaptive radiation of a Hawaiian woody species |
title_fullStr | Demography and selection analysis of the incipient adaptive radiation of a Hawaiian woody species |
title_full_unstemmed | Demography and selection analysis of the incipient adaptive radiation of a Hawaiian woody species |
title_short | Demography and selection analysis of the incipient adaptive radiation of a Hawaiian woody species |
title_sort | demography and selection analysis of the incipient adaptive radiation of a hawaiian woody species |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8782371/ https://www.ncbi.nlm.nih.gov/pubmed/35061669 http://dx.doi.org/10.1371/journal.pgen.1009987 |
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