| Title: | Dynamic properties of antennal responses to pheromone in two moth species |
| Author(s): | Justus KA; Carde RT; French AS; |
| Address: | "Department of Entomology, University of California, Riverside, California, USA" |
| ISSN/ISBN: | 0022-3077 (Print) 0022-3077 (Linking) |
| Abstract: | "Dynamic properties of pheromone plumes are behaviorally important in some moths for inducing upwind flight, but little is known about the time-dependent properties of odor transduction or the mechanisms that limit receptor dynamic sensitivity. We stimulated male antennae of two moth species, Cadra cautella and Spodoptera exigua, with pheromone plumes in a wind tunnel while recording electroantennograms (EAG) and concentration of a surrogate plume (propylene, which mimics a pheromone plume) using a photoionization detector (PID). Turbulent plumes were produced by mechanical baffles, creating broad frequency range dynamic concentration changes at the antennae. Frequency response functions and coherence functions between PID and EAG signals were used to measure the dynamic responses of the two species to pheromone blends and individual components. A single time constant filter fitted the responses of both species, but S. exigua was about three times faster than C. cautella. Responses to individual pheromone components were significantly different in S. exigua but not in C. cautella. We also fitted the data with a simple block-structured nonlinear cascade. This supported the simple filter model but also suggested that the response saturates at an early stage of chemotransduction" |
| Keywords: | Action Potentials/physiology Animals Male Moths/*physiology Pheromones/*physiology Smell/*physiology Species Specificity; |
| Notes: | "MedlineJustus, Kristine A Carde, Ring T French, Andrew S eng Comparative Study Research Support, Non-U.S. Gov't 2004/11/13 J Neurophysiol. 2005 Apr; 93(4):2233-9. doi: 10.1152/jn.00888.2004. Epub 2004 Nov 10" |
