Major ecological transitions in wild sunflowers facilitated by hybridization
Major ecological transitions in wild sunflowers facilitated by hybridization
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DOI：
10.1126/science.1086949
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发表时间：
2003-08-29
期刊：
影响因子：
56.9
通讯作者：
Lexer, C
中科院分区：
文献类型：
--
作者：
Rieseberg, LH;Raymond, O;Lexer, C
杂交在许多生物群体中很常见，但其在适应中的作用却鲜为人知。在向日葵中，在最极端的栖息地发现的物种是古老的杂交物种，据推测，杂交产生的新基因组合促成了生态分化。这种可能性是通过古代和合成杂交的表型和基因组比较来检验的。古代杂交种的大多数性状差异可以通过合成杂交种的互补基因作用重现，并受到选择的青睐。在合成杂交种中产生极端表型所需的亲本染色体片段的相同组合也发生在古代杂交种中。因此，杂交促进了向日葵的生态分化。
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.