Document Detail

Heritable variation and genetic correlation of quantitative traits within and between ecotypes of Avena barbata.
MedLine Citation:
PMID:  18373589     Owner:  NLM     Status:  MEDLINE    
We examined heritable variation for quantitative traits within and between naturally occurring mesic and xeric ecotypes of the slender wild oat (Avena barbata), and in 188 recombinant inbred lines derived from a cross between the ecotypes. We measured a suite of seedling and adult traits in the greenhouse, as well as performance-related traits in field sites native to the two ecotypes. Although the ecotypes were genetically diverged for most traits, few traits showed significant heritable variation within either ecotype. In contrast, considerable heritable variation was released in the recombinant progeny of the cross, and transgressive segregation was apparent in all traits. Heritabilities were substantially greater in the greenhouse than in the field, and this was associated with an increase in environmental variance in the field, rather than a decrease in genetic variance. Strong genetic correlations were evident among the recombinants, such that 22 measured traits could be well represented by only seven underlying factors, which accounted for 80% of the total variation. The primary axis of variation in the greenhouse described a trade-off between vegetative and reproductive allocation, mediated by the date of first flowering, and fitness was strongly correlated with this trade-off. Other factors in the greenhouse described variation in size and in seedling traits. Lack of correlation among these factors represents the release of multivariate trait variation through recombination. In the field, a separate axis of variation in overall performance was found for each year/site combination. Performance was significantly correlated across field environments, but not significantly correlated between greenhouse and field.
K M Gardner; R G Latta
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-03-27
Journal Detail:
Title:  Journal of evolutionary biology     Volume:  21     ISSN:  1420-9101     ISO Abbreviation:  J. Evol. Biol.     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-04-15     Completed Date:  2008-05-22     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8809954     Medline TA:  J Evol Biol     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  737-48     Citation Subset:  IM    
Department of Biology, Dalhousie University, Halifax, NS, Canada.
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MeSH Terms
Environment, Controlled
Genetic Variation*
Hybridization, Genetic
Poaceae / genetics*,  growth & development
Quantitative Trait Loci / genetics*
Seedling / genetics

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