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New Phytol

Title:		"Leaf trichome responses to herbivory in willows: induction, relaxation and costs"
Author(s):		Bjorkman C; Dalin P; Ahrne K;
Address:		"Department of Ecology, Swedish University of Agricultural Sciences, PO Box 7044, SE-750 07 Uppsala, Sweden. Marine Science Institute, University of California at Santa Barbara, CA 93106-6150, USA"
Journal Title:		New Phytol
Year:		2008
Volume:		20080409
Issue:		1
Page Number:		176 - 184
DOI:		10.1111/j.1469-8137.2008.02442.x
ISSN/ISBN:		1469-8137 (Electronic) 0028-646X (Linking)
Abstract:		"To circumvent the inherent problem of discriminating between the cost of losing photosynthetic tissue and the cost of producing an inducible defence, the growth response of herbivore-damaged plants was compared with plants damaged mechanically to the same extent but without eliciting the defence. Two experiments were conducted, studying the response of willows (Salix cinerea) to damage by adult leaf beetles (Phratora vulgatissima). In the first experiment, willows produced new leaves with an enhanced leaf trichome density 10-20 d after damage, coinciding in time with the feeding of beetle offspring. The response was relaxed in foliage produced 30-40 d after damage. In the second experiment, which also included mechanical damage, willows exposed to beetle feeding showed an increase in leaf trichome density of the same magnitude (> 70%) as in the first experiment. The cost of producing the defence was a 20% reduction in shoot length growth and biomass production. Willows exposed to mechanical damage had an 8% reduction in shoot length growth compared with control plants, that is, a cost of leaf area removal. The results are the first quantitative estimates of the cost of a plant defence induced by natural and low amounts (3.3%) of herbivory"
Keywords:		Animals Biomass Coleoptera/growth & development/*physiology Feeding Behavior Larva/growth & development/physiology Salix/anatomy & histology/*growth & development/physiology;
Notes:		"MedlineBjorkman, Christer Dalin, Peter Ahrne, Karin eng Research Support, Non-U.S. Gov't England 2008/04/11 New Phytol. 2008; 179(1):176-184. doi: 10.1111/j.1469-8137.2008.02442.x. Epub 2008 Apr 9"