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doi:10.1534/genetics.105.053538
A more recent version of this article appeared on April 1, 2006.
REGULAR RESEARCH PAPERS |
Detecting Adaptive Trait Introgression between Iris fulva and Iris brevicaulis in highly-selective field conditions
Noland H. Martin 1*, Amy C. Bouck 2 and Michael L. Arnold 1
1 University of Georgia
2 Duke University
* To whom correspondence should be addressed. E-mail: nhmartin{at}uga.edu.
Submitted on November 15, 2005
Revised on December 22, 2005
Accepted on 12 January 2006
The idea that natural hybridization has served as an important force in evolutionary and adaptive diversification has gained considerable momentum in recent years. By combining genome analyses with a highly selective field experiment, we provide evidence for adaptive trait introgression between two naturally hybridizing Louisiana Iris species, flood-tolerant Iris fulva and dry-adapted Iris brevicaulis. We planted reciprocal backcross (BC1) hybrids along with pure-species plants into natural settings that, due to a flooding event, favored I. fulva. As expected, I. fulva plants survived at much higher rates than I. brevicaulis. Backcross hybrids towards I. fulva (BCIF) also survived at significantly higher rates than the reciprocal backcross towards I. brevicaulis (BCIB). Survivorship of BCIB hybrids was strongly influenced by the presence of a number of introgressed I. fulva alleles located throughout the genome, while survivorship in the reciprocal BCIF hybrids was heavily influenced by two epistatically acting QTLs of opposite effects. These results demonstrate the potential for adaptive trait introgression between these two species, and may help to explain patterns of genetic variation observed in naturally occurring hybrid zones.
Key Words: QTL Cartographer, adaptive introgression, introgressive hybridization, reproductive isolation, speciation
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