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Genetics, Vol. 178, 339-350, January 2008, Copyright © 2008
doi:10.1534/genetics.107.081810
Population Genetics of Speciation in Two Closely Related Wild Tomatoes (Solanum Section Lycopersicon)
Thomas Städler1, Uraiwan Arunyawat2 and Wolfgang Stephan
Department Biologie II, Abteilung Evolutionsbiologie, University of Munich (LMU), 82152 Planegg-Martinsried, Germany
1 Corresponding author: Plant Ecological Genetics, Institute of Integrative Biology, ETH Zurich, Universitätsstrasse 16, 8092 Zurich, Switzerland.
E-mail: thomas.staedler{at}env.ethz.ch
We present a multilocus sequencing study to assess patterns of polymorphism and divergence in the closely related wild tomato species, Solanum peruvianum and S. chilense (Solanum section Lycopersicon, Solanaceae). The data set comprises seven mapped nuclear loci (
9.3 kb of analyzed sequence across loci) and four local population samples per species that cover much of the species' range (between 80 and 88 sequenced alleles across both species). We employ the analytical framework of divergence population genetics (DPG) in evaluating the utility of the "isolation" model of speciation to explain observed patterns of polymorphism and divergence. Whereas the isolation model is not rejected by goodness-of-fit criteria established via coalescent simulations, patterns of intragenic linkage disequilibrium provide evidence for postdivergence gene flow at two of the seven loci. These results suggest that speciation occurred under residual gene flow, implying that natural selection is one of the evolutionary forces driving the divergence of these tomato species. This inference is fully consistent with their recent divergence, conservatively estimated to be 
0.55 million years. We discuss possible biases in the demographic parameter estimates due to the current restriction of DPG algorithms to panmictic species.
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