« Previous AbstractColour mimicry and sexual deception by Tongue orchids (Cryptostylis)    Next AbstractDiagnostic biomarkers for lung cancer prevention »

Appl Environ Microbiol

Title:		Can Herbivore-Induced Volatiles Protect Plants by Increasing the Herbivores' Susceptibility to Natural Pathogens?
Author(s):		Gasmi L; Martinez-Solis M; Frattini A; Ye M; Collado MC; Turlings TCJ; Erb M; Herrero S;
Address:		"Department of Genetics and Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina (ERI-BIOTECMED), Universitat de Valencia, Valencia, Spain. Institute of Plant Sciences, University of Bern, Bern, Switzerland. Department of Biotechnology, Institute of Agrochemistry and Food Technology, National Research Council (IATA-CSIC), Valencia, Spain. Laboratory of Fundamental and Applied Research in Chemical Ecology, University of Neuchatel, Neuchatel, Switzerland. Department of Genetics and Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina (ERI-BIOTECMED), Universitat de Valencia, Valencia, Spain sherrero@uv.es"
Journal Title:		Appl Environ Microbiol
Year:		2019
Volume:		20181213
Issue:		1
Page Number:		-
DOI:		10.1128/AEM.01468-18
ISSN/ISBN:		1098-5336 (Electronic) 0099-2240 (Print) 0099-2240 (Linking)
Abstract:		"In response to insect herbivory, plants mobilize various defenses. Defense responses include the release of herbivore-induced plant volatiles (HIPVs) that can serve as signals to alert undamaged tissues and to attract natural enemies of the herbivores. Some HIPVs can have a direct negative impact on herbivore survival, but it is not well understood by what mechanisms. Here, we tested the hypothesis that exposure to HIPVs renders insects more susceptible to natural pathogens. Exposure of the caterpillars of the noctuid Spodoptera exigua to indole and linalool, but not exposure to (Z)-3-hexenyl acetate, increased the susceptibility to Spodoptera exiguamultiple nucleopolyhedrovirus (SeMNPV). We also found that exposure to indole, but not exposure to linalool or (Z)-3-hexenyl acetate, increased the pathogenicity of Bacillus thuringiensis Additional experiments revealed significant changes in microbiota composition after forty-eight hours of larval exposure to indole. Overall, these results provide evidence that certain HIPVs can strongly enhance the susceptibility of caterpillars to pathogens, possibly through effects on the insect gut microbiota. These findings suggest a novel mechanism by which HIPVs can protect plants from herbivorous insects.IMPORTANCE Multitrophic interactions involving insect pests, their natural enemies, microorganisms, and plant hosts are increasingly being recognized as relevant factors in pest management. In response to herbivory attacks, plants activate a wide range of defenses that aim to mitigate the damage. Attacked plants release herbivore-induced plant volatiles (HIPVs), which can act as priming signals for other plants and attract natural enemies of herbivores, and which may have a direct negative impact on herbivore survival. In the present work, we show that exposure of the insects to the induced volatiles could increase the insects' susceptibility to the entomopathogens naturally occurring in the plant environment. These findings suggest a novel role for plant volatiles by influencing insect interactions with natural pathogens, probably mediated by alterations in the insect microbiota composition. In addition, this work provides evidence for selectable plant traits (production of secondary metabolites) that can have an influence on the ecology of the pests and could be relevant in the improvement of pest management strategies using natural entomopathogens"
Keywords:		Acetates/metabolism Acyclic Monoterpenes Animals Bacillus thuringiensis/chemistry/*physiology Food Chain *Herbivory Indoles/metabolism Larva/growth & development/microbiology Monoterpenes/metabolism Spodoptera/growth & development/*microbiology Volatile O;
Notes:		"MedlineGasmi, Laila Martinez-Solis, Maria Frattini, Ada Ye, Meng Collado, Maria Carmen Turlings, Ted C J Erb, Matthias Herrero, Salvador eng Research Support, Non-U.S. Gov't 2018/10/28 Appl Environ Microbiol. 2018 Dec 13; 85(1):e01468-18. doi: 10.1128/AEM.01468-18. Print 2019 Jan 1"