Representation of a mixture of pheromone and host plant odor by antennal lobe projection neurons of the silkmoth Bombyx mori |
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Authors: | Shigehiro Namiki Satoshi Iwabuchi Ryohei Kanzaki |
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Institution: | (1) Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba Ibaraki, 305-8572, Japan;(2) Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan |
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Abstract: | Pheromone-source orientation behavior can be modified by coexisting plant volatiles. Some host plant volatiles enhance the
pheromonal responses of olfactory receptor neurons and increase the sensitivity of orientation behavior in the Lepidoptera
species. Although many electrophysiological studies have focused on the pheromonal response of olfactory interneurons, the
response to the mixture of pheromone and plant odor is not yet known. Using the silkmoth, Bombyx mori, we investigated the physiology of interneurons in the antennal lobe (AL), the primary olfactory center in the insect brain,
in response to a mixture of the primary pheromone component bombykol and cis-3-hexen-1-ol, a mulberry leaf volatile. Application of the mixture enhanced the pheromonal responses of projection neurons
innervating the macroglomerular complex in the AL. In contrast, the mixture of pheromone and cis-3-hexen-1-ol had little influence on the responses of projection neurons innervating the ordinary glomeruli whereas other
plant odors dynamically modified the response. Together this suggests moths can process plant odor information under conditions
of simultaneous exposure to sex pheromone. |
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Keywords: | Glomeruli Intracellular recording Blend Macroglomerular complex Synergy |
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