Isoprene interferes with the attraction of bodyguards by herbaceous plants

Isoprene is the most abundant volatile compound emitted by vegetation. It influences air chemistry and is part of plant defense against abiotic stresses. However, whether isoprene influences biotic interactions between plants and other organisms has not been investigated to date. Here we show a new...

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Veröffentlicht in:Proceedings of the National Academy of Sciences - PNAS 2008-11, Vol.105 (45), p.17430-17435
Hauptverfasser: Loivamäki, Maaria, Mumm, Roland, Dicke, Marcel, Schnitzler, Jörg-Peter
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container_issue 45
container_start_page 17430
container_title Proceedings of the National Academy of Sciences - PNAS
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creator Loivamäki, Maaria
Mumm, Roland
Dicke, Marcel
Schnitzler, Jörg-Peter
description Isoprene is the most abundant volatile compound emitted by vegetation. It influences air chemistry and is part of plant defense against abiotic stresses. However, whether isoprene influences biotic interactions between plants and other organisms has not been investigated to date. Here we show a new effect of isoprene, namely its influence on interactions between plants and insects. Herbivory induces the release of plant volatiles that attract the herbivore's enemies, such as parasitic wasps, as a kind of bodyguard. We used transgenic isoprene-emitting Arabidopsis plants in behavioral, chemical, and electrophysiological studies to investigate the effects of isoprene on ecological interactions in 2 tritrophic systems. We demonstrate that isoprene is perceived by the chemoreceptors of the parasitic wasp Diadegma semiclausum and interferes with the attraction of this parasitic wasp to volatiles from herbivore-infested plants. We verified this repellent effect on D. semiclausum female wasps by adding external isoprene to the volatile blend of wild-type plants. In contrast, the antennae of the parasitic wasp Cotesia rubecula do not perceive isoprene and the behavior of this wasp was not altered by isoprene emission. In addition, the performance of the 2 examined lepidopteran herbivores (Pieris rapae and Plutella xylostella) was not affected by isoprene emission. Therefore, attraction of parasitic wasps to host-infested herbaceous plants in the neighborhood of high isoprene emitters, such as poplar or willow, may be hampered by the isoprene emission that repels plant bodyguards.
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subjects Animals
Arabidopsis
Arabidopsis - chemistry
Arabidopsis thaliana
background odor
Biological Sciences
Butadienes - metabolism
Butadienes - pharmacology
chemical ecology
chemoreceptors
Chemotaxis - drug effects
Cotesia rubecula
cotesia-plutellae
Diadegma
Diadegma semiclausum
Electrophysiology
Emissions
Female animals
Flowers & plants
forest
gene-expression
Hemiterpenes - metabolism
Hemiterpenes - pharmacology
Herbivores
host plant
Hymenoptera
Insect antennae
insect pests
Insects
isoprene
isoprenoids
leaves
Lepidoptera
Memory interference
natural enemies
Odors
Parasitism
Parasitoids
Pentanes - metabolism
Pentanes - pharmacology
Pieris rapae
Plant resistance
plant-insect relations
Plants
Plants, Genetically Modified
Plutella xylostella
Pollutant emissions
predatory mites
smell
Smell - physiology
Species Specificity
terpenoid metabolism
Transgenic plants
tritrophic interactions
Vegetation
VOCs
Volatile organic compounds
Wasps - drug effects
title Isoprene interferes with the attraction of bodyguards by herbaceous plants
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