Characterizing genomic variation of Arabidopsis thaliana: the roles of geography and climate.
Mol Ecol
; 21(22): 5512-29, 2012 Nov.
Article
en En
| MEDLINE
| ID: mdl-22857709
ABSTRACT
Arabidopsis thaliana inhabits diverse climates and exhibits varied phenology across its range. Although A. thaliana is an extremely well-studied model species, the relationship between geography, growing season climate and its genetic variation is poorly characterized. We used redundancy analysis (RDA) to quantify the association of genomic variation [214 051 single nucleotide polymorphisms (SNPs)] with geography and climate among 1003 accessions collected from 447 locations in Eurasia. We identified climate variables most correlated with genomic variation, which may be important selective gradients related to local adaptation across the species range. Climate variation among sites of origin explained slightly more genomic variation than geographical distance. Large-scale spatial gradients and early spring temperatures explained the most genomic variation, while growing season and summer conditions explained the most after controlling for spatial structure. SNP variation in Scandinavia showed the greatest climate structure among regions, possibly because of relatively consistent phenology and life history of populations in this region. Climate variation explained more variation among nonsynonymous SNPs than expected by chance, suggesting that much of the climatic structure of SNP correlations is due to changes in coding sequence that may underlie local adaptation.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Variación Genética
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Clima
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Arabidopsis
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Genoma de Planta
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Mol Ecol
Asunto de la revista:
BIOLOGIA MOLECULAR
/
SAUDE AMBIENTAL
Año:
2012
Tipo del documento:
Article
País de afiliación:
Estados Unidos