| Patterns of allozyme variation in diploid and tetraploid Centaurea jacea at different spatial scales. | |
| | |
MedLine Citation:
|
PMID: 11430655 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The extent and spatial patterns of genetic variation at allozyme markers were investigated within and between diploid and autotetraploid knapweeds (Centaurea jacea L. sensu lato, Asteraceae) at contrasted geographic scales: (1) among populations sampled from a diploid-tetraploid contact zone in the northeastern part of the Belgian Ardennes, and (2) within mixed populations from that zone where diploids and tetraploids coexist. Our data were also compared with a published dataset by Sommer (1990) describing allozyme variation in separate diploid and tetraploid knapweeds populations collected throughout Europe. Genetic diversity was higher in tetraploids. In the Belgian Ardennes and within the mixed populations, both cytotypes had similar levels of spatial genetic structure, they were genetically differentiated, and their distributions of allele frequencies were not spatially correlated. In contrast, at the European scale, diploids and tetraploids did not show differentiated gene pools and presented a strong correlation between their patterns of spatial genetic variation. Numerical simulations showed that the striking difference in patterns observed at small and large geographic scales could be accounted for by a combination of (1) isolation by distance within cytotypes; and (2) partial reproductive barriers between cytotypes and/or recurrent formation of tetraploids. We suggest that this may explain the difficulty of the taxonomic treatment of knapweeds and of polyploid complexes in general. |
| | |
Authors:
|
O J Hardy; X Vekemans |
Related Documents
:
|
22781555 - Evolutionary and convergence stability for continuous phenotypes in finite populations ... 22396655 - Genomic tools for evolution and conservation in the chimpanzee: pan troglodytes ellioti... 17158465 - Testing dispersal hypotheses in foraging green sea turtles (chelonia mydas) of brazil. 22825795 - Benign hereditary chorea: dopaminergic brain imaging in patients with a novel intronic ... 20353605 - High frequency of lactose intolerance in a prehistoric hunter-gatherer population in no... 16221385 - What are snps and haplotypes and how will they help us manage the prevention of adult c... |
Publication Detail:
|
Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Evolution; international journal of organic evolution Volume: 55 ISSN: 0014-3820 ISO Abbreviation: Evolution Publication Date: 2001 May |
Date Detail:
|
Created Date: 2001-06-29 Completed Date: 2001-12-07 Revised Date: 2008-11-21 |
Medline Journal Info:
|
Nlm Unique ID: 0373224 Medline TA: Evolution Country: United States |
Other Details:
|
Languages: eng Pagination: 943-54 Citation Subset: IM |
Affiliation:
|
Laboratoire de Génétique et Ecologie Végétales, Université Libre de Bruxelles, Belgium. ohardy@ulb.ac.be |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Asteraceae
/
enzymology*,
genetics* Belgium Computer Simulation Diploidy Europe Evolution Genetic Variation* Genetics, Population Models, Genetic Polyploidy |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Deleterious mutations and genetic variation for flower size in Mimulus guttatus.
Next Document: Population structure and speciation in tropical seas: global phylogeography of the sea urchin Diadem...