Abstract
Selection of oviposition sites in insects represents an important part of their ecological adaptation. In Drosophila fruit flies, adult preference for a particular oviposition site determines larval food, affecting fitness throughout the entire life cycle. Two odorant-binding proteins (OBPs) OBP57d and OBP57e were identified to be involved in the evolution of specific preference for the toxic plant Morinda citrifolia L. in D. sechellia Tsacas & Bächli. D. melanogaster Meigen mutants for Obp57d and Obp57e showed enhanced preference for octanoic acid, but still not as much as D. sechellia does, indicating that other genes are also involved in the behavioral evolution of D. sechellia. Here, by using an improved method for behavioral assay, we found that the ablation of antenna enhanced the preference for octanoic acid in the Obp57d and Obp57e mutants to a level comparable with D. sechellia, suggesting that both olfactory and gustatory sensations are involved in oviposition site selection in response to octanoic acid. Behavioral analysis of gene-knockout strains revealed that Odorant receptor co-receptor (Orco) has little contribution compared with the effect of antennal ablation. These data suggest that in addition to Obp57d and Obp57e, the evolution of D. sechellia involves genetic changes in olfactory genes that function independently from Orco.
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This work was supported by Grant-in-Aid for Young Scientists (A) 21688003 from Japan Society for the Promotion of Science to TM.
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Matsuo, T. Contribution of olfactory and gustatory sensations of octanoic acid in the oviposition behavior of Drosophila melanogaster (Diptera: Drosophilidae). Appl Entomol Zool 47, 137–142 (2012). https://doi.org/10.1007/s13355-012-0100-3
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DOI: https://doi.org/10.1007/s13355-012-0100-3