Document Detail

Transgressive segregation, adaptation and speciation.
MedLine Citation:
PMID:  10583537     Owner:  NLM     Status:  MEDLINE    
The production of extreme or 'transgressive' phenotypes in segregating hybrid populations has been speculated to contribute to niche divergence of hybrid lineages. Here, we assess the frequency of transgressive segregation in hybrid populations, describe its genetic basis and discuss the factors that best predict its occurrence. From a survey of 171 studies that report phenotypic variation in segregating hybrid populations, we show that transgression is the rule rather than the exception. In fact, 155 of the 171 studies (91%) report at least one transgressive trait, and 44% of 1229 traits examined were transgressive. Transgression occurred most frequently in intraspecific crosses involving inbred, domesticated plant populations, and least frequently in interspecific crosses between outbred, wild animal species. Quantitative genetic studies of plant hybrids consistently point to the action of complementary genes as the primary cause of transgression, although overdominance and epistasis also contribute. Complementary genes appear to be common for most traits, with the possible exception of those with a history of disruptive selection. These results lend credence to the view that hybridization may provide the raw material for rapid adaptation and provide a simple explanation for niche divergence and phenotypic novelty often associated with hybrid lineages.
L H Rieseberg; M A Archer; R K Wayne
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Review    
Journal Detail:
Title:  Heredity     Volume:  83 ( Pt 4)     ISSN:  0018-067X     ISO Abbreviation:  Heredity     Publication Date:  1999 Oct 
Date Detail:
Created Date:  1999-12-29     Completed Date:  1999-12-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0373007     Medline TA:  Heredity     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  363-72     Citation Subset:  IM    
Department of Biology, Indiana University, Bloomington, IN 47405, USA.
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MeSH Terms
Adaptation, Biological / genetics*
Crosses, Genetic
Hybridization, Genetic / genetics*
Plants / genetics
Quantitative Trait, Heritable

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