Abstract
We investigated the hypothesis that observed higher levels of asymmetry displayed by insecticide-resistance genotypes of Lucilia cuprina are restricted to bristle characters, due to the action of resistance genes in bristle cell development, rather than through the disruption of genomic coadaptation. We compared the level of asymmetry of three bristle characters and three wing characters in non-modified and modified-resistance genotypes. Consistent with previous studies, resistance genotypes displayed greater levels of bristle asymmetry than either susceptible or modified genotypes. However, there were no differences among genotypes for any of the wing characters. To confirm that this result is attributable to the action of the resistance and modifier genes themselves, we also examined the responses of both bristle and wing characters to the more general developmental stress of extreme temperature. Sub-optimal temperature was shown to increase both bristle and wing asymmetry, suggesting that there are no underlying differences between the two character types which could, of themselves, explain the differential response observed in the resistance genotypes.
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Selected References
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- Allendorf F. W., Knudsen K. L., Leary R. F. Adaptive significance of differences in the tissue-specific expression of a phosphoglucomutase gene in rainbow trout. Proc Natl Acad Sci U S A. 1983 Mar;80(5):1397–1400. doi: 10.1073/pnas.80.5.1397. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Batterham P., Davies A. G., Game A. Y., McKenzie J. A. Asymmetry--where evolutionary and developmental genetics meet. Bioessays. 1996 Oct;18(10):841–845. doi: 10.1002/bies.950181011. [DOI] [PubMed] [Google Scholar]
- Freebairn K., Yen J. L., McKenzie J. A. Environmental and genetic effects on the asymmetry phenotype: Diazinon resistance in the Australian sheep blowfly, Lucilia cuprina. Genetics. 1996 Sep;144(1):229–239. doi: 10.1093/genetics/144.1.229. [DOI] [PMC free article] [PubMed] [Google Scholar]
- McKenzie J. A., Clarke G. M. Diazinon resistance, fluctuating asymmetry and fitness in the Australian sheep blowfly, lucilia cuprina. Genetics. 1988 Sep;120(1):213–220. doi: 10.1093/genetics/120.1.213. [DOI] [PMC free article] [PubMed] [Google Scholar]
- McKenzie J. A. Stress and asymmetry during arrested development of the Australian sheep blowfly. Proc Biol Sci. 1997 Dec 22;264(1389):1749–1756. doi: 10.1098/rspb.1997.0242. [DOI] [PMC free article] [PubMed] [Google Scholar]
- McKenzie J. A., Yen J. L. Genotype, environment and the asymmetry phenotype. Dieldrin-resistance in Lucilia cuprina (the Australian sheep blowfly). Heredity (Edinb) 1995 Aug;75(Pt 2):181–187. doi: 10.1038/hdy.1995.122. [DOI] [PubMed] [Google Scholar]
- doi: 10.1098/rspb.1997.0047. [DOI] [PMC free article] [Google Scholar]