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Brousseau Louise, Fine P. V. A., Dreyer E., Vendramin G. G., Scotti I. (2020). Genomic and phenotypic divergence unveil microgeographic adaptation in the Amazonian hyperdominant tree Eperua falcata Aubl. (Fabaceae). Molecular Ecology, [Early access], [19 p.]. ISSN 0962-1083

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Lien direct chez l'éditeur doi:10.1111/mec.15595

Titre
Genomic and phenotypic divergence unveil microgeographic adaptation in the Amazonian hyperdominant tree Eperua falcata Aubl. (Fabaceae)
Année de publication2020
Type de documentArticle référencé dans le Web of Science WOS:000566486700001
AuteursBrousseau Louise, Fine P. V. A., Dreyer E., Vendramin G. G., Scotti I.
SourceMolecular Ecology, 2020, [Early access], p. [19 p.]. p. [19 p.] ISSN 0962-1083
RésuméPlant populations can undergo very localized adaptation, allowing widely distributed populations to adapt to divergent habitats in spite of recurrent gene flow. Neotropical trees-whose large and undisturbed populations often span a variety of environmental conditions and local habitats-are particularly good models to study this process. Here, we explore patterns of adaptive divergence from large (i.e., regional) to small (i.e., microgeographic) spatial scales in the hyperdominant Amazonian tree Eperua falcata Aubl. (Fabaceae) under a replicated design involving two microhabitats (similar to 300 m apart) in two study sites (similar to 300 km apart). A three-year reciprocal transplant illustrates that, beyond strong maternal effects and phenotypic plasticity, genetically driven divergence in seedling growth and leaf traits was detected both between seedlings originating from different regions, and between seedlings from different microhabitats. In parallel, a complementary genome scan for selection was carried out through whole-genome sequencing of tree population pools. A set of 290 divergence outlier SNPs was detected at the regional scale (between study sites), while 185 SNPs located in the vicinity of 106 protein-coding genes were detected as replicated outliers between microhabitats within regions. Outlier-surrounding genomic regions are involved in a variety of physiological processes, including plant responses to stress (e.g., oxidative stress, hypoxia and metal toxicity) and biotic interactions. Together with evidence of microgeographic divergence in functional traits, the discovery of genomic candidates for microgeographic adaptive divergence represents a promising advance in our understanding of local adaptation, which probably operates across multiple spatial scales and underpins divergence and diversification in Neotropical trees.
Plan de classementEtudes, transformation, conservation du milieu naturel [082] ; Sciences du monde végétal [076] ; Sciences fondamentales / Techniques d'analyse et de recherche [020]
Descr. géo.AMAZONIE ; BRESIL ; GUYANE FRANCAISE ; SURINAME ; GUYANA ; VENEZUELA
LocalisationFonds IRD [F B010079710]
Identifiant IRDfdi:010079710
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010079710

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