Journal Article

Pheromone Detection by a Pheromone Emitter: A Small Sex Pheromone–Specific Processing System in the Female American Cockroach

Hiroshi Nishino, Masazumi Iwasaki and Makoto Mizunami

in Chemical Senses

Volume 36, issue 3, pages 261-270
Published in print March 2011 | ISSN: 0379-864X
Published online November 2010 | e-ISSN: 1464-3553 | DOI: https://dx.doi.org/10.1093/chemse/bjq122
Pheromone Detection by a Pheromone Emitter: A Small Sex Pheromone–Specific Processing System in the Female American Cockroach

More Like This

Show all results sharing this subject:

  • Molecular and Cell Biology

GO

Show Summary Details

Preview

Many 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 center) 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 projection neurons (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 with 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.

Keywords: insects; macroglomerular complex; pheromonal communication; projection neuron; sexual dimorphism

Journal Article.  5443 words.  Illustrated.

Subjects: Molecular and Cell Biology

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content. subscribe or purchase to access all content.