Experience-based behavioral and chemosensory changes in the generalist insect herbivore Helicoverpa armigera exposed to two deterrent plant chemicalsReport as inadecuate




Experience-based behavioral and chemosensory changes in the generalist insect herbivore Helicoverpa armigera exposed to two deterrent plant chemicals - Download this document for free, or read online. Document in PDF available to download.

Journal of Comparative Physiology A

, Volume 196, Issue 11, pp 791–799

First Online: 13 July 2010Received: 16 April 2010Revised: 29 June 2010Accepted: 30 June 2010

Abstract

Behavioral and electrophysiological responses of larvae of the polyphagous moth species Helicoverpa armigera to two plant-derived allelochemicals were studied, both in larvae that had been reared on a diet devoid of these compounds and in larvae previously exposed to these compounds. In dual-choice cotton leaf disk and pepper fruit disk arena assays, caterpillars reared on a normal artificial diet were strongly deterred by strychnine and strophanthin-K. However, caterpillars reared on an artificial diet containing strychnine were insensitive to strychnine and strophanthin-K. Similarly, caterpillars reared on an artificial diet containing strophanthin-K were also desensitized to both deterrent chemicals. Electrophysiological tests revealed that the deterrent-sensitive neurons in taste sensilla on the maxillae of caterpillars reared on each deterrent-containing diet displayed reduced sensitivity to the two chemicals compared with the caterpillars reared on normal diets. We conclude that the experience-dependent behavioral plasticity was partly based on the reduced sensitivity of taste receptor neurons and that the desensitization of taste receptor neurons contributed to the cross-habituation to the two chemicals.

KeywordsDeterrent neuron Sensilla styloconica Food experience Acquired insensitivity Cross-habituation  Download fulltext PDF



Author: Dongsheng Zhou - Joop J. A. van Loon - Chen-Zhu Wang

Source: https://link.springer.com/







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