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  A generalist herbivore copes with specialized plant defence: the effects of induction and feeding by Helicoverpa armigera

Zalucki, M. P., Zalucki, J. M., Perkins, L. E., Schramm, K., Giddings Vassão, D., Gershenzon, J., et al. (2017). A generalist herbivore copes with specialized plant defence: the effects of induction and feeding by Helicoverpa armigera. Journal of Chemical Ecology, 43(6), 608-616. doi:10.1007/s10886-017-0855-7.

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Zalucki, M. P., Author
Zalucki, J. M., Author
Perkins, L. E., Author
Schramm, Katharina1, Author           
Giddings Vassão, Daniel1, Author           
Gershenzon, Jonathan1, Author           
Heckel, David G.2, Author           
Affiliations:
1Department of Biochemistry, Prof. J. Gershenzon, MPI for Chemical Ecology, Max Planck Society, ou_421893              
2Department of Entomology, Prof. D. G. Heckel, MPI for Chemical Ecology, Max Planck Society, ou_421895              

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 Abstract: Plants of the Brassicaceae are defended from feeding by generalist insects by constitutively-expressed and herbivory-induced glucosinolates (GS). We induced Arabidopsis plants 1, 16 and 24 h prior to allowing neonate larvae of the generalist Helicoverpa armigera to feed on whole plants for 72 h. These plants were subsequently retested with another group of neonates for a further 72 h. We used wild-type A. thaliana Col-0, and mutant lines lacking indolic GS, aliphatic GS or all GS.We hypothesized that larvaewould not grow well on defended plants (WT) compared to those lacking GS, and would not grow well if plants had been primed or fed on for longer, due to the expected induced GS. There was survivorship on all lines suggesting H. armigera is a suitable generalist for these experiments. Larvae performed less well on wild-type and no indolic lines than on no aliphatic and no GS lines. Larvae distributed feeding damage extensively in all lines, more so on wild type and no-indolic lines. Contrary to expectations, larvae grew better on plants that had been induced for 1 to 16 h than on uninduced plants suggesting they moved to and selected less toxic plant parts within a heterogeneously defended plant. Performance declined on all lines if plants had been induced for 24 h, or had been fed upon for a further 72 h. However, contrary to expectation, individual and total GS did not increase after these two treatments. This suggests that Arabidopsis plants induce additional (not GS) defenses after longer induction periods.

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 Dates: 2017-05-282017-06-06
 Publication Status: Published online
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 Identifiers: Other: HEC375
DOI: 10.1007/s10886-017-0855-7
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Title: Journal of Chemical Ecology
Source Genre: Journal
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Publ. Info: New York : Plenum Pub. Corp.
Pages: - Volume / Issue: 43 (6) Sequence Number: - Start / End Page: 608 - 616 Identifier: ISSN: 0098-0331
CoNE: https://pure.mpg.de/cone/journals/resource/954925466258