Abstract
Males of the oriental fruit fly, Bactrocera dorsalis (Hendel) and some of its sibling species have strong affinity for methyl eugenol (ME). Methyl eugenol ingested by male flies is biotransformed in the crop to two ME metabolites that eventually accumulate in the rectal gland, which is known to serve as a reservoir for B. dorsalis sex pheromones. When fed with ME, males of laboratory and wild B. philippinensis Drew and Hancock selectively accumulated two metabolites, 2-allyl-4,5-dimethoxyphenol and (E)-coniferyl alcohol, in the rectal gland, as was seen for B. dorsalis sensu stricto, B. invadens Drew, Tsuruta and White, and B. papayae Drew and Hancock. Phylogenetic analysis of COI and rDNA sequence data of these four taxa also revealed a close relationship among B. philippinensis, B. dorsalis s.s., B. invadens, and B. papayae (all four are members of the dorsalis species complex). This result corroborates pheromone analysis. The usefulness of pheromonal analysis as a chemotaxonomy tool to complement molecular and other analysis in differentiation of closely related sibling species within the Bactrocera dorsalis complex, for which use of morphological characters had been inadequate, is highlighted.
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Acknowledgments
The authors would like to thank Andrew Jessup and Mark Schutze (FAO/IAEA Agriculture and Biotechnology Laboratory, Seibersdorf, Austria) for supplying sexually mature live male flies of B. philippinensis and specimens of B. invadens in alcohol, W. Orankanok and S. Chinvinijkul (Department of Agricultural Extension, Bangkok) for B. correcta and B. dorsalis, S. Permalloo (Entomology Division, Ministry of AgroIndustry and Fisheries, Mauritius) for B. zonata, and Hiroshi Enomoto for the wild B. philippinensis flies from Luzon island. Two of us (Tan and Wee) also express our sincere gratitude to Jorge Hendrichs of International Atomic Energy Agency, Vienna, for sponsoring our trip to Vienna during which feeding and extraction experiments were conducted. This work was partly supported by International Atomic Energy Agency-Coordinated Research Projects Contract numbers 16066 and 16160, and the Grant-in-Aid for Scientific Research from JSPS (No. 23380035) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and JST in Research for Promoting Technological Seeds (under R. Nishida).
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Tan, K.H., Wee, SL., Ono, H. et al. Comparison of methyl eugenol metabolites, mitochondrial COI, and rDNA sequences of Bactrocera philippinensis (Diptera: Tephritidae) with those of three other major pest species within the dorsalis complex. Appl Entomol Zool 48, 275–282 (2013). https://doi.org/10.1007/s13355-013-0183-5
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DOI: https://doi.org/10.1007/s13355-013-0183-5