Synergistic behavioral responses of female oriental fruit moths (Lepidoptera:Tortricidae) to synthetic host plant-derived mixtures are mirrored by odor-evoked calcium activity in their antennal lobes

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2008
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Piñero, Jaime C.
Dorn, Silvia
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Journal of Insect Physiology. 2008, 54(2), pp. 333-343. ISSN 0022-1910. Available under: doi: 10.1016/j.jinsphys.2007.10.002
Zusammenfassung

Attraction of many gravid female herbivore insects to suitable host plants is mediated largely by olfactory cues. Behaviorally, synergism among odor mixtures constituents underlies this attraction in some systems. Yet, the representation of synergistic odor-mixture effects is unknown in the antennal lobe, the first processing center for olfactory information in insect brains. Using both behavioral and physiological data we demonstrate that in the oriental fruit moth, Cydia (Grapholita) molesta, a minor constituent of a plant-derived synthetic mixture plays a key role in behavioral discrimination and in neural representation of mixtures. Behaviorally, minute amounts of benzonitrile added to an unattractive 4-compound mixture resulted in a bioactive 5-compound mixture that was as attractive to mated female moths as the natural blend. Physiologically, the bioactive benzonitrile-containing mixture elicited strong activation of one additional, new type of glomerulus that showed specific synergisms for this mixture. The specific pattern of activated glomeruli elicited by the addition of benzonitrile demonstrates a physiological correlate to the behaviorally observed synergism, and emphasizes the key role of a minor component of a complex mixture. While minor constituents of mixtures are often overlooked, they may, as conclusively documented here, be determinant for successful recognition and behavioral discrimination of suitable host plants by herbivore insects.

Zusammenfassung in einer weiteren Sprache
Fachgebiet (DDC)
570 Biowissenschaften, Biologie
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Behavior, Calcium imaging, Antennal lobe, Olfactory glomeruli, Odor mixture
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ISO 690PIÑERO, Jaime C., C. Giovanni GALIZIA, Silvia DORN, 2008. Synergistic behavioral responses of female oriental fruit moths (Lepidoptera:Tortricidae) to synthetic host plant-derived mixtures are mirrored by odor-evoked calcium activity in their antennal lobes. In: Journal of Insect Physiology. 2008, 54(2), pp. 333-343. ISSN 0022-1910. Available under: doi: 10.1016/j.jinsphys.2007.10.002
BibTex
@article{Pinero2008Syner-8248,
  year={2008},
  doi={10.1016/j.jinsphys.2007.10.002},
  title={Synergistic behavioral responses of female oriental fruit moths (Lepidoptera:Tortricidae) to synthetic host plant-derived mixtures are mirrored by odor-evoked calcium activity in their antennal lobes},
  number={2},
  volume={54},
  issn={0022-1910},
  journal={Journal of Insect Physiology},
  pages={333--343},
  author={Piñero, Jaime C. and Galizia, C. Giovanni and Dorn, Silvia}
}
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