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      Major ecological transitions in wild sunflowers facilitated by hybridization.

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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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          Author and article information

          Journal
          Science
          Science (New York, N.Y.)
          American Association for the Advancement of Science (AAAS)
          1095-9203
          0036-8075
          Aug 29 2003
          : 301
          : 5637
          Affiliations
          [1 ] Department of Biology, Indiana University, Bloomington, IN 47405, USA. lriesebe@indiana.edu
          Article
          1086949
          10.1126/science.1086949
          12907807
          51f44568-5a73-40de-b43f-fd28c2617254
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