Barker, Michael S. , Rieseberg, Loren H. .
Evolutionary genomics of hybridization: Detecting ancient hybridization and introgression by the inference of intrologs in plant genomes.
Natural hybridization has long fascinated botanists as a possible source of novelty and innovation, fueling a long running debate concerning the ultimate role of hybridization in plant evolution. One reason this debate has persisted since Darwin is that detecting ancient hybridization and introgression is difficult. Advances in genetic and phylogenetic tools have permitted the identification of a few homoploid hybrid species, but the time and effort required to make these diagnoses is not trivial. Here we present a novel and efficient method for identifying ancient hybridization and introgression by inferring intrologs (introgressed orthologs) in EST data sets. We explore our new test using genomic data from the well documented homoploid hybrid species Helianthus paradoxus and demonstrate the type of data required and range of questions our approach can address. Using our introlog analysis, we also provide evidence from analyses of plant ESTs of other, previously undocumented examples of ancient hybridization. From these surveys of plant ESTs, we also use our method to discriminate allo- and autopolyploidy and provide an estimate of the relative prevalence of these two forms of polyploid speciation.
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1 - Indiana University, Department of Biology, Jordan Hall, 1001 East Third Street, Bloomington, Indiana, 47405, USA
2 - University of British Columbia, Department of Botany, 3529-6270 University Blvd, Vancouver, BC, V6T 1Z4, Canada
Presentation Type: Oral Paper:Papers for Sections
Location: 182/I K Barber
Date: Monday, July 28th, 2008
Time: 11:00 AM