- THIS ARTICLE
- Full Text
- Full Text (PDF)
- Data Supplement
-
All Versions of this Article:
genetics.106.064469v1
175/4/1883 most recent - Alert me when this article is cited
- Alert me if a correction is posted
- SERVICES
- Email this article to a friend
- Similar articles in this journal
- Similar articles in PubMed
- Alert me to new issues of the journal
- Download to citation manager
- Reprints & Permissions
- CITING ARTICLES
- Citing Articles via HighWire
- Citing Articles via Google Scholar
- GOOGLE SCHOLAR
- Articles by Yatabe, Y.
- Articles by Rieseberg, L. H.
- Search for Related Content
- PUBMED
- PubMed Citation
- Articles by Yatabe, Y.
- Articles by Rieseberg, L. H.
Originally published as Genetics Published Articles Ahead of Print on February 4, 2007.
Genetics, Vol. 175, 1883-1893, April 2007, Copyright © 2007
doi:10.1534/genetics.106.064469
Rampant Gene Exchange Across a Strong Reproductive Barrier Between the Annual Sunflowers, Helianthus annuus and H. petiolaris
Yoko Yatabe*,
Nolan C. Kane*,
,
Caroline Scotti-Saintagne* and
Loren H. Rieseberg*,,1
* Department of Biology, Indiana University, Bloomington, Indiana 47405 and Department of Botany, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
1 Corresponding author: Department of Biology, Indiana University, 1001 E. Third St., Bloomington, IN 47405.
E-mail: lriesebe{at}indiana.edu
Plant species may remain morphologically distinct despite gene exchange with congeners, yet little is known about the genomewide pattern of introgression among species. Here we analyze the effects of persistent gene flow on genomic differentiation between the sympatric sunflower species Helianthus annuus and H. petiolaris. While the species are strongly isolated in testcrosses, genetic distances at 108 microsatellite loci and 14 sequenced genes are highly variable and much lower (on average) than for more closely related but historically allopatric congeners. Our analyses failed to detect a positive association between levels of genetic differentiation and chromosomal rearrangements (as reported in a prior publication) or proximity to QTL for morphological differences or hybrid sterility. However, a significant increase in differentiation was observed for markers within 5 cM of chromosomal breakpoints. Together, these results suggest that islands of differentiation between these two species are small, except in areas of low recombination. Furthermore, only microsatellites associated with ESTs were identified as outlier loci in tests for selection, which might indicate that the ESTs themselves are the targets of selection rather than linked genes (or that coding regions are not randomly distributed). In general, these results indicate that even strong and genetically complex reproductive barriers cannot prevent widespread introgression.
This article has been cited by other articles:
 |
|
 |
|
  S. Via In the Light of Evolution III: Two Centuries of Darwin Sackler Colloquium: Natural selection in action during speciation PNAS, June 16, 2009; 106(Supplement_1): 9939 - 9946. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. L. Strasburg, C. Scotti-Saintagne, I. Scotti, Z. Lai, and L. H. Rieseberg Genomic Patterns of Adaptive Divergence between Chromosomally Differentiated Sunflower Species Mol. Biol. Evol., June 1, 2009; 26(6): 1341 - 1355. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
K. Nadachowska and W. Babik Divergence in the Face of Gene Flow: The Case of Two Newts (Amphibia: Salamandridae) Mol. Biol. Evol., April 1, 2009; 26(4): 829 - 841. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. Carneiro, N. Ferrand, and M. W. Nachman Recombination and Speciation: Loci Near Centromeres Are More Differentiated Than Loci Near Telomeres Between Subspecies of the European Rabbit (Oryctolagus cuniculus) Genetics, February 1, 2009; 181(2): 593 - 606. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. A. Gonzalez-Perez, P. A. Sosa, E. Rivero, E. A. Gonzalez-Gonzalez, and A. Naranjo Molecular markers reveal no genetic differentiation between Myrica rivas-martinezii and M. faya (Myricaceae) Ann. Bot., January 1, 2009; 103(1): 79 - 86. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 C. Lexer and A. Widmer The genic view of plant speciation: recent progress and emerging questions Phil Trans R Soc B, September 27, 2008; 363(1506): 3023 - 3036. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 K. S. Kim, S. T. Ratcliffe, B. W. French, L. Liu, and T. W. Sappington Utility of EST-Derived SSRs as Population Genetics Markers in a Beetle J. Hered., March 1, 2008; 99(2): 112 - 124. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T. Stadler, U. Arunyawat, and W. Stephan Population Genetics of Speciation in Two Closely Related Wild Tomatoes (Solanum Section Lycopersicon) Genetics, January 1, 2008; 178(1): 339 - 350. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T. Nakazato, M.-K. Jung, E. A. Housworth, L. H. Rieseberg, and G. J. Gastony A Genomewide Study of Reproductive Barriers Between Allopatric Populations of a Homosporous Fern, Ceratopteris richardii Genetics, October 1, 2007; 177(2): 1141 - 1150. [Abstract] [Full Text] [PDF]
|
|