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Hybridization and divergence in multi-species oak (Quercus) communities
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. School of Forest Resources and Environmental Science, Michigan Technological Universi ty, 1400 Townsend Drive, Houghton, MI 49931, USA.
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2016 (English)In: Botanical journal of the Linnean Society, ISSN 0024-4074, E-ISSN 1095-8339, Vol. 181, no 1, 99-114 p.Article in journal (Refereed) PublishedText
Abstract [en]

Oaks (Quercus: Fagaceae) commonly interbreed yet retain their morphological, genetic and ecological distinctiveness. Post-zygotic isolation mechanisms, such as ecologically dependent selection on adaptive loci, may therefore limit introgression. To test this hypothesis, we quantified hybridization and genetic divergence across the contact zone of four red oaks (Quercus section Lobatae) in the Great Lakes region of North America using a suite of 259 amplified fragment length polymorphisms and 27 genic and genomic microsatellite markers. First, we identified hybrids using genetic structure analysis and confirmed the reliability of our assignments via simulations. Then, we identified candidate loci for species maintenance with three complementary tests for selection and obtained partial gene sequences linked to an outlier locus and three other loci. We detected evidence of recent hybridization among all species and considerable gene flow between Q.ellipsoidalis and Q.velutina. Overall, c.20% of Q.velutina had recent ancestry from Q.ellipsoidalis, whereas nearly 30% of Q.ellipsoidalis had a Q.velutina ancestor. Most loci were negligibly to weakly differentiated among species, but two gene-linked microsatellites deviated significantly from neutral expectations in multiple, complementary outlier tests. Both outlier loci were located in the same 15-cM bin on an existing Q.robur linkage map, a region under divergent selection in other oak species. Adaptive loci in this highly differentiated genomic region may contribute to ecological divergence among species and limit introgression.

Place, publisher, year, edition, pages
2016. Vol. 181, no 1, 99-114 p.
Keyword [en]
genetic divergence, introgression, outlier loci, Quercus section Lobatae, red oaks, selective sweep
National Category
Genetics and Breeding
URN: urn:nbn:se:umu:diva-120090DOI: 10.1111/boj.12393ISI: 000374176300006OAI: diva2:936006
Available from: 2016-06-13 Created: 2016-05-09 Last updated: 2016-06-13Bibliographically approved

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Sullivan, Alexis R.
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