Journal article
THE GENETIC BASIS FOR FRUIT ODOR DISCRIMINATION IN RHAGOLETIS FLIES AND ITS SIGNIFICANCE FOR SYMPATRIC HOST SHIFTS
Evolution, Vol.59(9), pp.1953-1964
Received March 8, 2005. Accepted June 22, 2005
09/2005
DOI: 10.1111/j.0014-3820.2005.tb01065.x
PMID: 16261733
Abstract
Rhagoletis pomonella (Diptera: Tephritidae) use volatile compounds emitted from the surface of ripening fruit as important chemosensory cues for recognizing and distinguishing among alternative host plants. Host choice is of evolutionary significance in Rhagoletis because these flies mate on or near the fruit of their respective host plants. Differences in host choice based on fruit odor discrimination therefore result in differential mate choice and prezygotic reproductive isolation, facilitating sympatric speciation in the absence of geographic isolation. We test for a genetic basis for host fruit odor discrimination through an analysis of F2 and backcross hybrids constructed between apple-, hawthorn-, and flowering dogwood-infesting Rhagoletis flies. We recovered a significant proportion (30–65%) of parental apple, hawthorn, and dogwood fly response phenotypes in F2 hybrids, despite the general failure of F1 hybrids to reach odor source spheres. Segregation patterns in F2 and backcross hybrids suggest that only a modest number of allelic differences at a few loci may underlie host fruit odor discrimination. In addition, a strong bias was observed for F2 and backcross flies to orient to the natal fruit blend of their maternal grandmother, implying the existence of cytonuclear gene interactions. We explore the implications of our findings for the evolutionary dynamics of sympatric host race formation and speciation.
Details
- Title: Subtitle
- THE GENETIC BASIS FOR FRUIT ODOR DISCRIMINATION IN RHAGOLETIS FLIES AND ITS SIGNIFICANCE FOR SYMPATRIC HOST SHIFTS
- Creators
- Hattie R Dambroski - Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana 46556-0369Charles Linn Jr - Department of Entomology, New York State Agricultural Experimental Station, Cornell University, Geneva, New York 14456Stewart H Berlocher - Department of Entomology, University of Illinois, 320 Morrill Hall, 505 South Goodwin Avenue, Urbana, Illinois 61801Andrew A Forbes - Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana 46556-0369Wendell Roelofs - Department of Entomology, New York State Agricultural Experimental Station, Cornell University, Geneva, New York 14456Jeffrey L Feder - Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana 46556-0369
- Resource Type
- Journal article
- Publication Details
- Evolution, Vol.59(9), pp.1953-1964
- Edition
- Received March 8, 2005. Accepted June 22, 2005
- Publisher
- Blackwell Publishing Ltd
- DOI
- 10.1111/j.0014-3820.2005.tb01065.x
- PMID
- 16261733
- ISSN
- 0014-3820
- eISSN
- 1558-5646
- Number of pages
- 12
- Language
- English
- Date published
- 09/2005
- Academic Unit
- Biology; University College Courses
- Record Identifier
- 9984217540302771
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