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Proc Biol Sci

Title:		Pest trade-offs in technology: reduced damage by caterpillars in Bt cotton benefits aphids
Author(s):		Hagenbucher S; Wackers FL; Wettstein FE; Olson DM; Ruberson JR; Romeis J;
Address:		"Agroscope Reckenholz-Tanikon Research Station ART, , Reckenholzstrasse 191, 8046 Zurich, Switzerland"
Journal Title:		Proc Biol Sci
Year:		2013
Volume:		20130313
Issue:		1758
Page Number:		20130042 -
DOI:		10.1098/rspb.2013.0042
ISSN/ISBN:		1471-2954 (Electronic) 0962-8452 (Print) 0962-8452 (Linking)
Abstract:		"The rapid adoption of genetically engineered (GE) plants that express insecticidal Cry proteins derived from Bacillus thuringiensis (Bt) has raised concerns about their potential impact on non-target organisms. This includes the possibility that non-target herbivores develop into pests. Although studies have now reported increased populations of non-target herbivores in Bt cotton, the underlying mechanisms are not fully understood. We propose that lack of herbivore-induced secondary metabolites in Bt cotton represents a mechanism that benefits non-target herbivores. We show that, because of effective suppression of Bt-sensitive lepidopteran herbivores, Bt cotton contains reduced levels of induced terpenoids. We also show that changes in the overall level of these defensive secondary metabolites are associated with improved performance of a Bt-insensitive herbivore, the cotton aphid, under glasshouse conditions. These effects, however, were not as clearly evident under field conditions as aphid populations were not correlated with the amount of terpenoids measured in the plants. Nevertheless, increased aphid numbers were visible in Bt cotton compared with non-Bt cotton on some sampling dates. Identification of this mechanism increases our understanding of how insect-resistant crops impact herbivore communities and helps underpin the sustainable use of GE varieties"
Keywords:		"Animals Aphids/*physiology Bacillus thuringiensis/genetics/metabolism Bacillus thuringiensis Toxins Bacterial Proteins/genetics/metabolism Chromatography, High Pressure Liquid Endotoxins/genetics/metabolism Gossypium/genetics/*growth & development/metabol;"
Notes:		"MedlineHagenbucher, Steffen Wackers, Felix L Wettstein, Felix E Olson, Dawn M Ruberson, John R Romeis, Jorg eng Research Support, Non-U.S. Gov't England 2013/03/15 Proc Biol Sci. 2013 Mar 13; 280(1758):20130042. doi: 10.1098/rspb.2013.0042. Print 2013 May 7"