Principles of crucifer evolution
Borja, Guadalupe , Doust, Andrew .
Overcoming incomplete lineage sorting and gene flow to reconstruct the evolutionary relationships of Paysonia (Brassicaceae).
The genus Paysonia consists of eight species in the southern central plains and in Tennessee and Alabama. Species are morphologically distinct but preliminary phylogenetic analyses have suggested that both incomplete lineage sorting and gene flow complicate the recovery of the true species phylogeny. Each of these processes also impacts genetic diversity, which is of special concern for the three species that are federally listed as threatened or endangered. To investigate species relationships and patterns of gene flow we resolved to take a multi-gene approach using multiple accessions from the different populations of each species. We have used both chloroplast and nuclear markers and find significant differences in phylogenetic relationships suggested by each marker. We have also used multiple microsatellite markers to document gene flow between the different populations of each species to determine patterns and extent of gene-flow. Our results indicate a complex blend of phyletic relationships and present day and historic gene flow in the eastern species, but suggest that the two most endangered species are relatively isolated from gene flow.
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1 - 221 S Duncan St., Stillwater, OK, 74074, USA
2 - Oklahoma State University, Botany, Physical Sciences Room 301, Stillwater, OK, 74078, USA
Presentation Type: Symposium or Colloquium Presentation
Location: Delaware C/Hyatt
Date: Tuesday, July 10th, 2012
Time: 3:00 PM