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J Chem Ecol

Title:		Defense Suppression through Interplant Communication Depends on the Attacking Herbivore Species
Author(s):		Marmolejo LO; Thompson MN; Helms AM;
Address:		"Department of Entomology, Texas A&M University, College Station, TX, 77843-2475, USA. Department of Entomology, Texas A&M University, College Station, TX, 77843-2475, USA. amhelms@tamu.edu"
Journal Title:		J Chem Ecol
Year:		2021
Volume:		20210920
Issue:		12
Page Number:		1049 - 1061
DOI:		10.1007/s10886-021-01314-6
ISSN/ISBN:		1573-1561 (Electronic) 0098-0331 (Print) 0098-0331 (Linking)
Abstract:		"In response to herbivory, plants emit volatile compounds that play important roles in plant defense. Herbivore-induced plant volatiles (HIPVs) can deter herbivores, recruit natural enemies, and warn other plants of possible herbivore attack. Following HIPV detection, neighboring plants often respond by enhancing their anti-herbivore defenses, but a recent study found that herbivores can manipulate HIPV-interplant communication for their own benefit and suppress defenses in neighboring plants. Herbivores induce species-specific blends of HIPVs and how these different blends affect the specificity of plant defense responses remains unclear. Here we assessed how HIPVs from zucchini plants (Cucurbita pepo) challenged with different herbivore species affect resistance in neighboring plants. Volatile 'emitter' plants were damaged by one of three herbivore species: saltmarsh caterpillars (Estigmene acrea), squash bugs (Anasa tristis), or striped cucumber beetles (Acalymma vittatum), or were left as undamaged controls. Neighboring 'receiver' plants were exposed to HIPVs or control volatiles and then challenged by the associated herbivore species. As measures of plant resistance, we quantified herbivore feeding damage and defense-related phytohormones in receivers. We found that the three herbivore species induced different HIPV blends from squash plants. HIPVs induced by saltmarsh caterpillars suppressed defenses in receivers, leading to greater herbivory and lower defense induction compared to controls. In contrast, HIPVs induced by cucumber beetles and squash bugs did not affect plant resistance to subsequent herbivory in receivers. Our study shows that herbivore species identity affects volatile-mediated interplant communication in zucchini, revealing a new example of herbivore defense suppression through volatile cues"
Keywords:		Animals Coleoptera/*physiology Hemiptera/growth & development/*physiology *Herbivory Larva/growth & development/physiology Moths/growth & development/*physiology Nymph/growth & development/physiology Plant Growth Regulators/*metabolism Species Specificity;
Notes:		"MedlineMarmolejo, Laura O Thompson, Morgan N Helms, Anjel M eng NIFA-2017-67012-31498/national institute of food and agriculture/ 2021/09/21 J Chem Ecol. 2021 Dec; 47(12):1049-1061. doi: 10.1007/s10886-021-01314-6. Epub 2021 Sep 20"