Scattered differentiation of unlinked loci across the genome underlines ecological divergence of the selfing grass Brachypodium stacei

Ecological divergence without geographic isolation, as an early speciation process that may lead finally to reproductive isolation through natural selection, remains a captivating topic in evolutionary biology. However, the pattern of genetic divergence underlying this process across the genome may...

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Autores: Mu, Wenjie, Li, Kexin, Yang, Yongzhi, Breiman, Adina, Lou, Shangling, Yang, Jiao, Wu, Ying, Wu, Shuang, Liu, Jianquan, Nevo, Eviatar, Catalan, Pilar
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Institución:Universidad de Zaragoza
Repositorio:Zaguán. Repositorio Digital de la Universidad de Zaragoza
OAI Identifier:oai:zaguan.unizar.es:129468
Acceso en línea:http://zaguan.unizar.es/record/129468
Access Level:acceso abierto
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spelling Scattered differentiation of unlinked loci across the genome underlines ecological divergence of the selfing grass Brachypodium staceiMu, WenjieLi, KexinYang, YongzhiBreiman, AdinaLou, ShanglingYang, JiaoWu, YingWu, ShuangLiu, JianquanNevo, EviatarCatalan, PilarEcological divergence without geographic isolation, as an early speciation process that may lead finally to reproductive isolation through natural selection, remains a captivating topic in evolutionary biology. However, the pattern of genetic divergence underlying this process across the genome may vary between species and mating systems. Here, we present evidence that Brachypodium stacei, an annual and highly selfing grass model species, has undergone sympatric ecological divergence without geographic isolation. Genomic, transcriptomic, and metabolomic analyses together with lab experiments mimicking the two opposite environmental conditions suggest that diploid B. stacei populations have diverged sympatrically in two slopes characterized by distinct biomes at Evolution Canyon I (ECI), Mount Carmel, Israel. Despite ongoing gene flow, primarily facilitated by seed dispersal, the level of gene flow has progressively decreased over time. This local adaptation involves the scattered divergence of many unlinked loci across the total genome that include both coding genes and noncoding regions. Additionally, we have identified significant differential expressions of genes related to the ABA signaling pathway and contrasting metabolome composition between the arid- vs. forest-adapted B. stacei populations in ECI. These results suggest that multiple small loci involved in environmental responses act additively to account for ecological adaptations by this selfing species in contrasting environments.2023info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://zaguan.unizar.es/record/129468reponame:Zaguán. Repositorio Digital de la Universidad de Zaragozainstname:Universidad de ZaragozaInglésinfo:eu-repo/grantAgreement/ES/DGA-FSE/A01-23Rinfo:eu-repo/grantAgreement/ES/DGA/LMP82-21info:eu-repo/grantAgreement/ES/MICINN/PID2019-108195GB-I00info:eu-repo/semantics/openAccessoai:zaguan.unizar.es:1294682026-05-29T13:59:51Z
dc.title.none.fl_str_mv Scattered differentiation of unlinked loci across the genome underlines ecological divergence of the selfing grass Brachypodium stacei
title Scattered differentiation of unlinked loci across the genome underlines ecological divergence of the selfing grass Brachypodium stacei
spellingShingle Scattered differentiation of unlinked loci across the genome underlines ecological divergence of the selfing grass Brachypodium stacei
Mu, Wenjie
title_short Scattered differentiation of unlinked loci across the genome underlines ecological divergence of the selfing grass Brachypodium stacei
title_full Scattered differentiation of unlinked loci across the genome underlines ecological divergence of the selfing grass Brachypodium stacei
title_fullStr Scattered differentiation of unlinked loci across the genome underlines ecological divergence of the selfing grass Brachypodium stacei
title_full_unstemmed Scattered differentiation of unlinked loci across the genome underlines ecological divergence of the selfing grass Brachypodium stacei
title_sort Scattered differentiation of unlinked loci across the genome underlines ecological divergence of the selfing grass Brachypodium stacei
dc.creator.none.fl_str_mv Mu, Wenjie
Li, Kexin
Yang, Yongzhi
Breiman, Adina
Lou, Shangling
Yang, Jiao
Wu, Ying
Wu, Shuang
Liu, Jianquan
Nevo, Eviatar
Catalan, Pilar
author Mu, Wenjie
author_facet Mu, Wenjie
Li, Kexin
Yang, Yongzhi
Breiman, Adina
Lou, Shangling
Yang, Jiao
Wu, Ying
Wu, Shuang
Liu, Jianquan
Nevo, Eviatar
Catalan, Pilar
author_role author
author2 Li, Kexin
Yang, Yongzhi
Breiman, Adina
Lou, Shangling
Yang, Jiao
Wu, Ying
Wu, Shuang
Liu, Jianquan
Nevo, Eviatar
Catalan, Pilar
author2_role author
author
author
author
author
author
author
author
author
author
description Ecological divergence without geographic isolation, as an early speciation process that may lead finally to reproductive isolation through natural selection, remains a captivating topic in evolutionary biology. However, the pattern of genetic divergence underlying this process across the genome may vary between species and mating systems. Here, we present evidence that Brachypodium stacei, an annual and highly selfing grass model species, has undergone sympatric ecological divergence without geographic isolation. Genomic, transcriptomic, and metabolomic analyses together with lab experiments mimicking the two opposite environmental conditions suggest that diploid B. stacei populations have diverged sympatrically in two slopes characterized by distinct biomes at Evolution Canyon I (ECI), Mount Carmel, Israel. Despite ongoing gene flow, primarily facilitated by seed dispersal, the level of gene flow has progressively decreased over time. This local adaptation involves the scattered divergence of many unlinked loci across the total genome that include both coding genes and noncoding regions. Additionally, we have identified significant differential expressions of genes related to the ABA signaling pathway and contrasting metabolome composition between the arid- vs. forest-adapted B. stacei populations in ECI. These results suggest that multiple small loci involved in environmental responses act additively to account for ecological adaptations by this selfing species in contrasting environments.
publishDate 2023
dc.date.none.fl_str_mv 2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://zaguan.unizar.es/record/129468
url http://zaguan.unizar.es/record/129468
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/ES/DGA-FSE/A01-23R
info:eu-repo/grantAgreement/ES/DGA/LMP82-21
info:eu-repo/grantAgreement/ES/MICINN/PID2019-108195GB-I00
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv
publisher.none.fl_str_mv
dc.source.none.fl_str_mv reponame:Zaguán. Repositorio Digital de la Universidad de Zaragoza
instname:Universidad de Zaragoza
instname_str Universidad de Zaragoza
reponame_str Zaguán. Repositorio Digital de la Universidad de Zaragoza
collection Zaguán. Repositorio Digital de la Universidad de Zaragoza
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