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Chem Senses

Title:		Functional divergence of spatially conserved olfactory glomeruli in two related moth species
Author(s):		Vickers NJ; Christensen TA;
Address:		"Department of Biology, University of Utah, Salt Lake City, UT 84112, USA. vickers@biology.utah.edu"
Journal Title:		Chem Senses
Year:		2003
Volume:		28
Issue:		4
Page Number:		325 - 338
DOI:		10.1093/chemse/28.4.325
ISSN/ISBN:		0379-864X (Print) 0379-864X (Linking)
Abstract:		"In different moth species, the number and spatial arrangement of olfactory glomeruli in the antennal lobe (AL) vary widely, but the spatial map within a species is thought to be invariant, making it possible to identify single glomeruli across individuals. We investigated the relationship between the physiological tuning of pheromone-selective interneurons and their association with specific, identified glomeruli in the macroglomerular complex (MGC) of the noctuid moth, Heliothis subflexa. Three odorants that are required for pheromone-source location in this species were tested individually and in blends. Recordings from 27 pheromone-specific projection neurons (PNs) indicated that the majority (48%) were selectively activated by the major pheromone component of this species, Z-11-hexadecenal (Z11-16:Ald), with 33% primarily tuned to Z-9-hexadecenal and 19% to Z-11-hexadecenol. Intracellular staining revealed that the dendrites of PNs tuned to Z11-16:Ald always branched within the largest glomerulus of the MGC, the cumulus. Similarly, each of the other two classes of PN was associated with a different 'satellite' glomerulus in the MGC. The spatial configuration of the four-glomerulus H. subflexa MGC was indistinguishable from that previously reported in the closely related species, Heliothis virescens. Hence, as these two species diverged, changes in the association of satellite MGC glomeruli with particular odorants have occurred without a measurable change in the anatomical arrangement of the glomerular array"
Keywords:		"Action Potentials Animals Female Ketones Male Microscopy, Confocal Moths/anatomy & histology/*physiology Neurons/classification/drug effects/physiology *Odorants Olfactory Bulb/anatomy & histology/physiology Sex Attractants/chemistry/physiology Species Sp;"
Notes:		"MedlineVickers, Neil J Christensen, Thomas A eng Comparative Study Research Support, U.S. Gov't, Non-P.H.S. England 2003/05/29 Chem Senses. 2003 May; 28(4):325-38. doi: 10.1093/chemse/28.4.325"