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Smelling the wood from the trees: non-linear parasitoid responses to volatile attractants produced by wild and cultivated cabbage

Gols, Rieta; Bullock, James M.; Dicke, Marcel; Bukovinszky, Tibor; Harvey, Jeffrey A.. 2011 Smelling the wood from the trees: non-linear parasitoid responses to volatile attractants produced by wild and cultivated cabbage. Journal of Chemical Ecology, 37 (8). 795-807. 10.1007/s10886-011-9993-5

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Abstract/Summary

Despite a large number of studies on herbivore-induced plant volatiles (HIPVs), little is known about which specific compounds are used by natural enemies to locate prey- or host- infested plants. In addition, the role of HIPVs in attracting natural enemies has been restricted largely to agricultural systems. Differences in volatile blends emitted by cultivars and plants that originate from wild populations may be attributed to potentially contrasting selection regimes: natural selection among the wild types and artificial selection among cultivars. A more realistic understanding of these interactions in a broader ecological and evolutionary framework should include studies that involve insect herbivores, parasitoids, and wild plants on which they naturally interact in the field. We compared the attractiveness of HIPVs emitted by wild and cultivated cabbage to the parasitoid Cotesia rubecula, and determined the chemical composition of the HIPV blends to elucidate which compounds are involved in parasitoid attraction. Wild and cultivated cabbage differed significantly in their volatile emissions. Cotesia rubecula was differentially attracted to the wild cabbage populations and preferred wild over cultivated cabbage. Isothiocyanates, which were only emitted by the wild cabbages, may be the key components that explain the preference for wild over cultivated cabbage, whereas terpenes may be important for the differential attraction among the wild populations. Volatile analysis revealed that parasitoid attraction cannot be explained by simple linear relationships. Our results suggest that unraveling which compound(s) are innately attractive to parasitoids of cabbage pests should include wild Brassicaceae.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1007/s10886-011-9993-5
Programmes: CEH Topics & Objectives 2009 - 2012 > Biodiversity > BD Topic 1 - Observations, Patterns, and Predictions for Biodiversity
CEH Sections: Hails
ISSN: 0098-0331
Additional Information. Not used in RCUK Gateway to Research.: Open Access article - click on the Official URL link for full text
Additional Keywords: Brassica, Cotesia rubecula, HIPV, induction, jasmonic acid, terpenes, terpenoids, tritrophic interaction, VOC
NORA Subject Terms: Biology and Microbiology
Date made live: 07 Sep 2011 11:07
URI: http://nora.nerc.ac.uk/id/eprint/15069

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