Major ecological transitions in wild sunflowers facilitated by hybridization |
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| Authors: | Rieseberg Loren H Raymond Olivier Rosenthal David M Lai Zhao Livingstone Kevin Nakazato Takuya Durphy Jennifer L Schwarzbach Andrea E Donovan Lisa A Lexer Christian |
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| Institution: | Department of Biology, Indiana University, Bloomington, IN 47405, USA. lriesebe@indiana.edu |
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| Abstract: | Hybridization is frequent in many organismal groups, but its role in adaptation is poorly understood. In sunflowers, species found in the most extreme habitats are ancient hybrids, and new gene combinations generated by hybridization are speculated to have contributed to ecological divergence. This possibility was tested through phenotypic and genomic comparisons of ancient and synthetic hybrids. Most trait differences in ancient hybrids could be recreated by complementary gene action in synthetic hybrids and were favored by selection. The same combinations of parental chromosomal segments required to generate extreme phenotypes in synthetic hybrids also occurred in ancient hybrids. Thus, hybridization facilitated ecological divergence in sunflowers. |
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