Speciation and Introgression between Mimulus nasutus and Mimulus guttatus
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| Authors: | Yaniv Brandvain Amanda M Kenney Lex Flagel Graham Coop Andrea L Sweigart |
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| Affiliation: | 1.Department of Evolution and Ecology & Center for Population Biology, University of California - Davis, Davis, California, United States of America;2.Department of Plant Biology, University of Minnesota – Twin Cities. St. Paul, Minnesota, United States of America;3.Department of Genetics, University of Georgia, Athens, Georgia, United States of America;4.Monsanto Company, Chesterfield, Missouri, United States of America; University of Cambridge, United Kingdom |
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| Abstract: | Mimulus guttatus and M. nasutus are an evolutionary and ecological model sister species pair differentiated by ecology, mating system, and partial reproductive isolation. Despite extensive research on this system, the history of divergence and differentiation in this sister pair is unclear. We present and analyze a population genomic data set which shows that M. nasutus budded from a central Californian M. guttatus population within the last 200 to 500 thousand years. In this time, the M. nasutus genome has accrued genomic signatures of the transition to predominant selfing, including an elevated proportion of nonsynonymous variants, an accumulation of premature stop codons, and extended levels of linkage disequilibrium. Despite clear biological differentiation, we document genomic signatures of ongoing, bidirectional introgression. We observe a negative relationship between the recombination rate and divergence between M. nasutus and sympatric M. guttatus samples, suggesting that selection acts against M. nasutus ancestry in M. guttatus. |
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