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Title

Detecting short spatial scale local adaptation and epistatic selection in climate-related candidate genes in European beech (Fagus sylvatica) populations

Publication Year

2014

Author(s)
  • Csillery, Katalin
  • Lalaguee, Hadrien
  • Vendramin, Giovanni G.
  • Gonzalez-Martinez, Santiago C.
  • Fady, Bruno
  • Oddou-Muratorio, Sylvie
Source
MOLECULAR ECOLOGY Volume: 23 Issue: 19 Pages: 4696-4708 Published: 2014
ISSN
0962-1083 eISSN: 1365-294X
Abstract

Detecting signatures of selection in tree populations threatened by climate change is currently a major research priority. Here, we investigated the signature of local adaptation over a short spatial scale using 96 European beech (Fagus sylvatica L.) individuals originating from two pairs of populations on the northern and southern slopes of Mont Ventoux (south-eastern France). We performed both single and multilocus analysis of selection based on 53 climate-related candidate genes containing 546 SNPs. F-ST outlier methods at the SNP level revealed a weak signal of selection, with three marginally significant outliers in the northern populations. At the gene level, considering haplotypes as alleles, two additional marginally significant outliers were detected, one on each slope. To account for the uncertainty of haplotype inference, we averaged the Bayes factors over many possible phase reconstructions. Epistatic selection offers a realistic multilocus model of selection in natural populations. Here, we used a test suggested by Ohta based on the decomposition of the variance of linkage disequilibrium. Overall populations, 0.23% of the SNP pairs (haplotypes) showed evidence of epistatic selection, with nearly 80% of them being within genes. One of the between gene epistatic selection signals arose between an F-ST outlier and a nonsynonymous mutation in a drought response gene. Additionally, we identified haplotypes containing selectively advantageous allele combinations which were unique to high or low elevations and northern or southern populations. Several haplotypes contained nonsynonymous mutations situated in genes with known functional importance for adaptation to climatic factors.

Author Keyword(s)
  • abiotic stress
  • budburst phenology
  • F-ST outlier
  • gene network
  • haplotype
  • Ohta's test
  • variance components of linkage disequilibrium
KeyWord(s) Plus
  • QUANTITATIVE TRAIT LOCI
  • LINKAGE DISEQUILIBRIUM
  • NUCLEOTIDE DIVERSITY
  • TREE POPULATIONS
  • CLINAL VARIATION
  • NEUTRAL MARKERS
  • DIFFERENTIATION
  • HISTORY
  • RECONSTRUCTION
  • DETERMINANTS
ESI Discipline(s)
  • Biology & Biochemistry
  • Environment/Ecology
  • Molecular Biology & Genetics
  • Plant & Animal Science
Web of Science Category(ies)
  • Biochemistry & Molecular Biology
  • Ecology
  • Evolutionary Biology
Adress(es)

[Csillery, Katalin; Lalaguee, Hadrien; Fady, Bruno; Oddou-Muratorio, Sylvie] INRA, Ecol Forestiere Mediterraneenne UR629, F-84914 Avignon, France; [Lalaguee, Hadrien] Scuola Super Sant Anna, I-56127 Pisa, Italy; [Lalaguee, Hadrien; Vendramin, Giovanni G.] CNR, Inst Bisci & Bioresources, I-50019 Florence, Italy; [Gonzalez-Martinez, Santiago C.] CIFOR INIA, Forest Res Ctr, Madrid 28040, Spain

Reprint Adress

Oddou-Muratorio, S (reprint author), INRA, Unite Rech Forestieres Mediterraneennes, Site Agroparc, F-84914 Avignon 9, France.

Country(ies)
  • France
  • Italy
  • Spain
CNRS - Adress(es)
    Accession Number
    WOS:000342743000006
    uid:/JHV7HCH9
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