Hybridization and the colonization of novel habitats by annual sunflowers |
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Authors: | Loren H Rieseberg Seung-Chul Kim Rebecca A Randell Kenneth D Whitney Briana L Gross Christian Lexer Keith Clay |
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Institution: | (1) Department of Biology, Indiana University, Bloomington, IN 47405, USA;(2) Department of Botany and Plant Science, University of California, Riverside, CA 92521, USA;(3) Jodrell Laboratory, Royal Botanic Gardens Kew, Richmond, Surrey, TW9 3DS, UK |
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Abstract: | Although invasive plant species often have a hybrid ancestry, unambiguous evidence that hybridization has stimulated the evolution
of invasive behaviors has been difficult to come by. Here, we briefly review how hybridization might contribute to the colonization
of novel habitats, range expansions, and invasiveness and then describe work on hybrid sunflowers that forges a direct link
between hybridization and ecological divergence. We first discuss the invasion of Texas by the common sunflower and show that
the introgression of chromosomal segments from a locally adapted species may have facilitated range expansion. We then present
evidence that the colonization of sand dune, desert floor, and salt marsh habitats by three hybrid sunflower species was made
possible by selection on extreme or “transgressive” phenotypes generated by hybridization. This body of work corroborates
earlier claims regarding the role of hybridization in adaptive evolution and provides an experimental and conceptual framework
for ongoing studies in this area. |
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Keywords: | Colonization Helianthus Hybridization Introgression Invasiveness QTLs Range expansion |
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