Ecological, genetic and evolutionary drivers of regional genetic differentiation in Arabidopsis thaliana
Castilla, Antonio R. (Consejo Superior de Investigaciones Científicas. Estación Biológica de Doñana. Departamento de Ecología Integrativa)
Méndez-Vigo, Belén (Consejo Superior de Investigaciones Científicas. Centro Nacional de Biotecnología. Departamento de Genética Molecular de Plantas)
Marcer, Arnald (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Martínez-Minaya, Joaquín (Basque Center for Applied Mathematics)
Conesa, David (Universitat de València. Departament d'Estadística i Investigació Operativa)
Picó, Xavier (Consejo Superior de Investigaciones Científicas. Estación Biológica de Doñana. Departamento de Ecología Integrativa)
Alonso-Blanco, Carlos (Consejo Superior de Investigaciones Científicas. Centro Nacional de Biotecnología. Departamento de Genética Molecular de Plantas)

Data:	2020
Resum:	Disentangling the drivers of genetic differentiation is one of the cornerstones in evolution. This is because genetic diversity, and the way in which it is partitioned within and among populations across space, is an important asset for the ability of populations to adapt and persist in changing environments. We tested three major hypotheses accounting for genetic differentiation-isolation-by-distance (IBD), isolation-by-environment (IBE) and isolation-by-resistance (IBR)-in the annual plant Arabidopsis thaliana across the Iberian Peninsula, the region with the largest genomic diversity. To that end, we sampled, genotyped with genome-wide SNPs, and analyzed 1772 individuals from 278 populations distributed across the Iberian Peninsula. IBD, and to a lesser extent IBE, were the most important drivers of genetic differentiation in A. thaliana. In other words, dispersal limitation, genetic drift, and to a lesser extent local adaptation to environmental gradients, accounted for the within- and among-population distribution of genetic diversity. Analyses applied to the four Iberian genetic clusters, which represent the joint outcome of the long demographic and adaptive history of the species in the region, showed similar results except for one cluster, in which IBR (a function of landscape heterogeneity) was the most important driver of genetic differentiation. Using spatial hierarchical Bayesian models, we found that precipitation seasonality and topsoil pH chiefly accounted for the geographic distribution of genetic diversity in Iberian A. thaliana. Overall, the interplay between the influence of precipitation seasonality on genetic diversity and the effect of restricted dispersal and genetic drift on genetic differentiation emerges as the major forces underlying the evolutionary trajectory of Iberian A. thaliana.
Ajuts:	Agencia Estatal de Investigación BIO2016-75754-P
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Genetic diversity ; Genetic structure ; Iberian Peninsula ; Nested maximum-likelihood population effect models ; Precipitation seasonality ; Spatial hierarchical Bayesian models
Publicat a:	BMC evolutionary biology, Vol. 20 (June 2020) , art. 71, ISSN 1471-2148

DOI: 10.1186/s12862-020-01635-2
PMID: 32571210

13 p, 1.3 MB

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