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Journal of Biological Rhythms
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An Antennal Circadian Clock and Circadian Rhythms in Peripheral Pheromone Reception in the Moth Spodoptera littoralis

Christine Merlin

UMR 1272 INRA-UPMC-AgroParisTech "Physiologie de l'Insecte: Signalisation et Communication," INRA Centre de Versailles, Versailles cedex, France

Philippe Lucas

UMR 1272 INRA-UPMC-AgroParisTech "Physiologie de l'Insecte: Signalisation et Communication," INRA Centre de Versailles, Versailles cedex, France

Didier Rochat

UMR 1272 INRA-UPMC-AgroParisTech "Physiologie de l'Insecte: Signalisation et Communication," INRA Centre de Versailles, Versailles cedex, France

Marie-Christine François

UMR 1272 INRA-UPMC-AgroParisTech "Physiologie de l'Insecte: Signalisation et Communication," INRA Centre de Versailles, Versailles cedex, France

Martine Maïbèche-Coisne

UMR 1272 INRA-UPMC-AgroParisTech "Physiologie de l'Insecte: Signalisation et Communication," INRA Centre de Versailles, Versailles cedex, France

Emmanuelle Jacquin-Joly

UMR 1272 INRA-UPMC-AgroParisTech "Physiologie de l'Insecte: Signalisation et Communication," INRA Centre de Versailles, Versailles cedex, France, jacquin{at}versailles.inra.fr

Circadian rhythms are observed in mating behaviors in moths: females emit sex pheromones and males are attracted by these pheromones in rhythmic fashions. In the moth Spodoptera littoralis, we demonstrated the occurrence of a circadian oscillator in the antenna, the peripheral olfactory organ. We identified different clock genes, period (per), cryptochrome1 (cry1) and cryptochrome2 (cry2), in this organ. Using quantitative real-time PCR (qPCR), we found that their corresponding transcripts cycled circadianly in the antenna as well as in the brain. Electroantennogram (EAG) recordings over 24 h demonstrated for the first time a circadian rhythm in antennal responses of a moth to sex pheromone. qPCR showed that out of one pheromone-binding protein (PBP), one olfactory receptor (OR), and one odorant-degrading enzyme (ODE), all putatively involved in the pheromone reception, only the ODE transcript presented a circadian rhythm that may be related to rhythms in olfactory signal resolution. Peripheral or central circadian clock control of olfaction is then discussed in light of recent data.

Key Words: olfactory rhythms • circadian clock • olfaction • sex pheromone • Spodoptera littoralis • electroantennography • real-time PCR

Journal of Biological Rhythms, Vol. 22, No. 6, 502-514 (2007)
DOI: 10.1177/0748730407307737
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[Abstract] [Full Text] [PDF]