2024-03-28T12:49:10Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/474922022-11-17T02:08:08Zhdl_2115_20057hdl_2115_148Pheromone Detection by a Pheromone Emitter : A Small Sex Pheromone-Specific Processing System in the Female American Cockroach1000080332477Nishino, HiroshiIwasaki, MasazumiMizunami, Makotoopen accessThis is a pre-copy-editing, author-produced PDF of an article accepted for publication in Chemical Senses following peer review. The definitive publisher-authenticated version Chem. Senses (2011) 36 (3): 261-270 is available online at: http://chemse.oxfordjournals.org/content/36/3/261insectsmacroglomerular complexpheromonal communicationprojection neuronsexual dimorphism486Many animals depend on pheromone communication for successful mating. Sex pheromone in insects is usually released by females to attract males. In American cockroaches, the largest glomerulus (B-glomerulus) in the male antennal lobe (first-order olfactory centre) processes the major component of sex pheromone. Using intracellular recordings combined with fine neuroanatomical techniques, we provide evidence that the female homolog of the male B-glomerulus also acts as a sex pheromone-specific detector. Whereas ordinary glomeruli that process normal environmental odors are innervated by single PNs, the B-glomerulus in both sexes is innervated by multiple PNs, one of which possesses a thicker axon, termed here B-PN. Both soma size and axon diameter were smaller on B-PNs from females compared to B-PNs from males. The female B-PNs also produce fewer terminal arborizations in the protocerebrum than male B-PNs. Termination fields in the lateral protocerebrum of the female B-PN are mostly segregated from those formed by other uniglomerular PNs innervating ordinary glomeruli. Female B-PN activity was greatest in response to sex pheromone but lower than that in the male B-PN. This specific detection system suggests that sex pheromone affects the behavior and/or endocrine system of female cockroaches.Oxford University Press2011-03engjournal articleAMhttp://hdl.handle.net/2115/47492https://doi.org/10.1093/chemse/bjq122210985840379-864XChemical Senses363261270https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/47492/1/CS36-3_261-270.pdfapplication/pdf6.1 MB2011-03