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​BdorOrco is important for oviposition-deterring behavior induced by both the volatile and non-volatile repellents in Bactrocera dorsalis (Diptera: Tephritidae)


Journal of Insect Physiology Volume 65, June 2014, Pages 51–56.  DOI: 10.1016/j.jinsphys.2014.05.007



• Citronella oil and Rhodojaponin-III have intense oviposition-deterring activity.
• BdorOrco and BdorOBP were involved in the detection of volatile oviposition repellents.
• Silencing the expression of BdorOrco resulted in disoriented oviposition behaviors induced by two repellents.
Several studies have shown that the selections of gravid females to potential oviposition sites from a distance were mediated by volatile signals, however, the means by which the sensory cues from non-volatile chemicals affected the insect behavior were still a controversial subject. Chemosensory in insect is a complex process, which is mediated by multigene families of chemoreceptors, including olfactory receptors, olfactory co-receptors, and odorant-binding proteins. To elucidate the chemoreception mechanism of volatile and non-volatile chemicals, the roles of Orco and OBP in oviposition-deterrent activities induced by citronellal and Rhodojaponin-III were investigated. Our results suggested that RNAi-mediated expression inhibition was successfully achieved by feeding dsRNA in Bactrocera dorsalis  . High levels of BdorOrco expression were essential for recognizing two chemicals of different physical properties, whereas the expression of BdorOBP was only imperative in perception of volatile chemical. The results suggested that volatile and non-volatile chemicals may evoke distinct molecular basis for chemosensory in the flies, while Orco was essential in the perception of both chemicals. The study highlighted that the central role of Orco in chemical recognition, which enabled it to be the universally applied target of designing new botanical pesticide.



  • Odorant receptors;
  • Odorant binding proteins;
  • Bactrocera dorsalis;
  • Oviposition repellents;
  • RNA interference

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Created at 10/06/2014 18:10 by Abdeljelil Bakri
Last modified at 10/06/2014 18:10 by Abdeljelil Bakri