Fehlberg, Shannon D. , Ferguson, Carolyn J. .
Genetic structure and evolutionary history of the Phlox woodhousei (Polemoniaceae) complex inferred from microsatellite data.
Speciation can be seen as a continuous process of divergence between evolutionary lineages. Investigating patterns of genetic and ecological isolation may provide insights into the mechanisms of speciation. Phlox woodhousei and P. amabilis (Polemoniaceae) are two closely related endemic species occurring in open sites in coniferous forests in Arizona and New Mexico. These taxa share many morphological features but differ in reproductive characters of potential ecological significance. Populations of both taxa were sampled throughout their ranges. Five microsatellite loci were genotyped to assess genetic structure and gene flow among populations, and ploidy levels were inferred using flow cytometry. Genotyping revealed complex banding patterns corresponding to variation in ploidy level (diploid, tetraploid and hexaploid populations; corroborated by flow cytometry data). Bayesian analysis of genetic structure indicated that P. woodhousei and P. amabilis are distinct, with low levels of gene flow among populations of the two species. Diploid and tetraploid populations within species are characterized by high levels of gene flow; however, hexaploid populations of P. amabilis are unique, suggesting an allopolyploid origin with a parental taxon unsampled in the present study.
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1 - Kansas State University, Division of Biology, Ackert Hall, Manhattan, Kansas, 66506-4901, USA
2 - Kansas State University, Herbarium and Division of Biology, Ackert Hall, Manhattan, Kansas, 66506-4901, USA
Presentation Type: Oral Paper:Papers for Topics
Date: Tuesday, July 29th, 2008
Time: 10:00 AM