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J Econ Entomol

Title:		Indirect Root Defenses Cause Induced Fitness Costs in Bt-Resistant Western Corn Rootworm
Author(s):		Hiltpold I; Hibbard BE;
Address:		"Department of Entomology and Wildlife Ecology, College of Agriculture and Natural Resources, University of Delaware, Newark, DE. USDA-ARS, Plant Genetic Unit, University of Missouri, Columbia, MO"
Journal Title:		J Econ Entomol
Year:		2018
Volume:		111
Issue:		5
Page Number:		2349 - 2358
DOI:		10.1093/jee/toy220
ISSN/ISBN:		1938-291X (Electronic) 0022-0493 (Linking)
Abstract:		"Plants genetically modified to produce insecticidal toxins from the bacterium Bacillus thuringiensis Berliner (Bt) have been extensively used to manage the western corn rootworm (WCR), Diabrotica virgifera virgifera LeConte (Coleoptera: Chrysomelidae) in the United States. Evolution of WCR resistance to Bt toxins has forced the consideration of alternative pest management and improved insect resistance management. Entomopathogenic nematodes (EPNs), obligate insect parasites, are attracted toward volatile organic compounds (VOCs) emitted by maize roots after WCR herbivory. The production of VOCs of two types of Bt maize (MON88017 and MIR604) and their near-isolines was evaluated after induction with Bt-susceptible and resistant WCR. The attraction of EPNs toward the Bt hybrids was tested in the laboratory and the field. Bt hybrids emitted VOCs when induced by Bt-resistant insects whereas induction by Bt-susceptible WCR did not elicit a plant response. Survival of Bt-resistant WCR was lower on the hybrid attracting EPNs and similar to the survival of Bt-susceptible WCR without EPNs. This trade-off of Bt-resistance is defined here as an induced fitness cost, and offers a viable tool to management of Bt-resistant WCR"
Keywords:		Animals Bacillus thuringiensis Toxins *Bacterial Proteins *Coleoptera *Endotoxins Genetic Fitness *Hemolysin Proteins Insecticide Resistance Larva *Nematoda Olfactometry Plant Roots/*metabolism Volatile Organic Compounds/analysis/*metabolism Zea mays/*met;
Notes:		"MedlineHiltpold, Ivan Hibbard, Bruce E eng Research Support, Non-U.S. Gov't England 2018/08/08 J Econ Entomol. 2018 Sep 26; 111(5):2349-2358. doi: 10.1093/jee/toy220"