COMPARATIVE GENOMIC AND POPULATION GENETIC ANALYSES INDICATE HIGHLY POROUS GENOMES AND HIGH LEVELS OF GENE FLOW BETWEEN DIVERGENTHELIANTHUSSPECIES
Open Access
- 29 July 2009
- Vol. 63 (8), 2061-2075
- https://doi.org/10.1111/j.1558-5646.2009.00703.x
Abstract
While speciation can be found in the presence of gene flow, it is not clear what impact this gene flow has on genome‐ and range‐wide patterns of differentiation. Here we examine gene flow across the entire range of the common sunflower, H. annuus, its historically allopatric sister species H. argophyllus and a more distantly related, sympatric relative H. petiolaris. Analysis of genotypes at 26 microsatellite loci in 1015 individuals from across the range of the three species showed substantial introgression between geographically proximal populations of H. annuus and H. petiolaris, limited introgression between H. annuus and H. argophyllus, and essentially no gene flow between the allopatric pair, H. argophyllus and H. petiolaris. Analysis of sequence divergence levels among the three species in 1420 orthologs identified from EST databases identified a subset of loci showing extremely low divergence between H. annuus and H. petiolaris and extremely high divergence between the sister species H. annuus and H. argophyllus, consistent with introgression between H. annuus and H. petiolaris at these loci. Thus, at many loci, the allopatric sister species are more genetically divergent than the more distantly related sympatric species, which have exchanged genes across much of the genome while remaining morphologically and ecologically distinct.Keywords
This publication has 85 references indexed in Scilit:
- Ecological selection maintains cytonuclear incompatibilities in hybridizing sunflowersEcology Letters, 2008
- Multiple Paleopolyploidizations during the Evolution of the Compositae Reveal Parallel Patterns of Duplicate Gene Retention after Millions of YearsMolecular Biology and Evolution, 2008
- MOLECULAR DEMOGRAPHIC HISTORY OF THE ANNUAL SUNFLOWERSHELIANTHUS ANNUUSANDH. PETIOLARIS-LARGE EFFECTIVE POPULATION SIZES AND RATES OF LONG-TERM GENE FLOWEvolution, 2008
- PAML 4: Phylogenetic Analysis by Maximum LikelihoodMolecular Biology and Evolution, 2007
- Microarray analysis reveals differential gene expression in hybrid sunflower speciesMolecular Ecology, 2006
- MUSCLE: multiple sequence alignment with high accuracy and high throughputNucleic Acids Research, 2004
- The Arabidopsis Information Resource (TAIR): a model organism database providing a centralized, curated gateway to Arabidopsis biology, research materials and communityNucleic Acids Research, 2003
- An economic method for the fluorescent labeling of PCR fragmentsNature Biotechnology, 2000
- Gapped BLAST and PSI-BLAST: a new generation of protein database search programsNucleic Acids Research, 1997
- Plant invasions, interspecific hybridization and the evolution of new plant taxaTrends in Ecology & Evolution, 1992