Publication Date:
2003-08-09
Description:
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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉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 -- R01 G59065/PHS HHS/ -- New York, N.Y. -- Science. 2003 Aug 29;301(5637):1211-6. Epub 2003 Aug 7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Indiana University, Bloomington, IN 47405, USA. lriesebe@indiana.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12907807" target="_blank"〉PubMed〈/a〉
Keywords:
*Adaptation, Physiological
;
*Biological Evolution
;
Chromosome Mapping
;
Diploidy
;
*Ecosystem
;
Environment
;
Genes, Plant
;
Genome, Plant
;
Genotype
;
Helianthus/*genetics/physiology
;
*Hybridization, Genetic
;
Microsatellite Repeats
;
Mutation
;
Phenotype
;
Quantitative Trait Loci
;
Selection, Genetic
;
Species Specificity
;
United States
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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