Differential introgression reveals candidate genes for selection across a spruce (Picea sitchensis × P. glauca) hybrid zone

Differential patterns of introgression between species across ecological gradients provide a fine-scale depiction of extrinsic and intrinsic factors that contribute to the maintenance of species barriers and adaptation across heterogeneous environments. Introgression was examined for 721 individuals...

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Bibliographic Details
Published in:The New phytologist 2013-02, Vol.197 (3), p.927-938
Main Authors: Hamilton, Jill A., Lexer, Christian, Aitken, Sally N.
Format: Article
Language:English
Subjects:
Adaptation
Annual precipitation
Climate
Clines
Divergence
Ecological genetics
ecological gradient
Ecological zones
Evolutionary genetics
Gene frequency
Genes
Genetic loci
Genome, Plant
Genomes
genomic cline
Genomics
Genotype
Genotypes
geographic cline
Geography
hybrid zone
Hybridity
Hybridization, Genetic
Interspecific
Loci
Nucleotides
Outliers (statistics)
Picea
Picea - genetics
Picea sitchensis
Polymorphism, Single Nucleotide
Rivers
selection
Selection, Genetic
single nucleotide polymorphisms (SNPs)
Single-nucleotide polymorphism
Species
spruce
Transition zone
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Summary:Differential patterns of introgression between species across ecological gradients provide a fine-scale depiction of extrinsic and intrinsic factors that contribute to the maintenance of species barriers and adaptation across heterogeneous environments. Introgression was examined for 721 individuals collected from the ecological transition zone spanning maritime to continental climates within the Picea sitchensis–Picea glauca contact zone using a panel of 268 candidate gene single nucleotide polymorphisms. Geographic clines showed a strong spatial relationship between allele frequencies and both distance from the ocean along major rivers and mean annual precipitation, indicating a strong role for environmental selection. Interspecific patterns of differentiation using outlier tests revealed three candidate genes that may be targets of long-term divergent selection between the parental species, although contemporary genomic clines within the hybrid zone suggested neutral patterns of introgression for these genes. This study provides a fine-scale analysis of locus-specific introgression, identifying a suite of candidate loci that may be targets of extrinsic or intrinsic selection, with broad application in understanding local adaptation to climate.
ISSN:0028-646X
1469-8137
DOI:10.1111/nph.12055