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Oecologia

Title:		Adult beetle grazing induces willow trichome defence against subsequent larval feeding
Author(s):		Dalin P; Bjorkman C;
Address:		"Department of Entomology, Swedish University of Agricultural Sciences, PO Box 7044, 750 07 Uppsala, Sweden. Peter.Dalin@entom.slu.se"
Journal Title:		Oecologia
Year:		2003
Volume:		20021022
Issue:		1
Page Number:		112 - 118
DOI:		10.1007/s00442-002-1093-3
ISSN/ISBN:		0029-8549 (Print) 0029-8549 (Linking)
Abstract:		"Induced increases in trichome density to grazing by herbivores have been suggested to increase plant resistance to future herbivore attack. In this paper we present results which show that plants of Salix cinerea L. respond to adult leaf beetle (Phratora vulgatissima L.) grazing by developing new leaves with an increased trichome density. The same plants are usually attacked again later in the season when the next generation of larvae hatches on the plants. The effect of the induced response was studied by comparing larval growth and feeding on newly developed leaves of plants exposed to different defoliation treatments. Larvae on plants previously exposed to adult grazing consumed less total leaf area and showed more dispersed feeding than larvae on plants protected from previous grazing. Larvae on plants exposed to mechanical defoliation responded intermediately. These results corresponded to the increased trichome density of defoliated plants. However, we found this larval response only in whole plant tests--when reared on single, excised leaves in petri dishes, larvae in all treatments behaved similarly. This discrepancy between the on-plant experiment and that in petri dishes highlights how experimental design may alter the conclusion of a study. We suggest that the induced response to adult grazing may act as a defence against subsequent larval feeding"
Keywords:		"*Adaptation, Physiological Aging Animals Coleoptera/*physiology *Eating Larva/*physiology Plant Leaves/parasitology/physiology Salix/*parasitology/*physiology;"
Notes:		"MedlineDalin, Peter Bjorkman, Christer eng Research Support, Non-U.S. Gov't Germany 2003/03/21 Oecologia. 2003 Jan; 134(1):112-8. doi: 10.1007/s00442-002-1093-3. Epub 2002 Oct 22"