PMID: 11392386Jun 8, 2001Paper

Low intraspecific variation for genomic isolation between hybridizing sunflower species

Evolution; International Journal of Organic Evolution
C A Buerkle, Loren H Rieseberg

Abstract

Barriers to gene flow between species result from selection against foreign linkage blocks in hybrids. When the geographic ranges of taxa meet at multiple locations, the opportunity exists for variation in the genetic architecture of isolating barriers. Hybrid zones between two sunflower species (Helianthus annuus and H. petiolaris) in Nebraska and California exhibited remarkably similar patterns of introgression of mapped molecular markers. Congruence among hybrid zones may result from limited intraspecific variation at loci contributing to isolation and from similar selective effects of alleles in the heterospecific genetic background. The observed consistency of introgression patterns across distantly separated hybrid zones suggests that intrinsic forces predominate in determining hybrid zone dynamics and boundaries between these sunflower species.

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Jun 27, 2008·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Christian Lexer, Alex Widmer
Oct 3, 2009·Evolution; International Journal of Organic Evolution·Katherine C TeeterPriscilla K Tucker
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