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Identifying loci under selection across contrasting environments in Avena barbata using quantitative trait locus

Kyle M Gardner1, Robert G Latta

  • 1Department of Biology, Dalhousie University, 1355 Oxford St., Halifax, NS, Canada B3H 4J1.

Molecular Ecology
|April 22, 2006
PubMed
Summary

Genetic analysis of wild oat (Avena barbata) ecotypes revealed quantitative trait loci (QTL) under selection in diverse environments. Findings suggest limited evidence for balancing selection maintaining genetic variation across contrasting moisture conditions.

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Area of Science:

  • Plant genetics
  • Evolutionary biology
  • Ecology

Background:

  • Recombinant inbred lines (RILs) were created from ecotypes of Avena barbata adapted to different moisture environments.
  • Understanding genetic variation and selection is crucial for predicting plant adaptation.

Purpose of the Study:

  • To identify quantitative trait loci (QTL) under selection in Avena barbata across contrasting environments.
  • To investigate the role of genotype by environment interactions in maintaining genetic variation.

Main Methods:

  • Construction of RILs from contrasting Avena barbata ecotypes.
  • Common garden reciprocal transplant experiments in field and greenhouse settings.
  • Development of an amplified fragment length polymorphism (AFLP) linkage map with 129 markers.

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Main Results:

  • Identified QTL under selection in native field sites and a greenhouse environment.
  • Consistent selection at specific loci across years at the same site.
  • Overlapping but not identical sets of selected loci across different sites, with some loci showing site-specific selection.
  • Greenhouse QTL were generally unlinked to field QTL, indicating selection on different traits.

Conclusions:

  • Limited evidence for selection favoring alternate alleles in alternate environments, suggesting genotype by environment interaction may not maintain genetic variation in A. barbata.
  • Additive effect QTL best explained genetic variation in the greenhouse where heritability was high and variation was not depleted by past selection.