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  Trichobaris weevils distinguish amongst toxic hostplants by sensing volatiles that do not affect larval performance

Lee, G., Joo, Y., Diezel, C., Lee, E. J., Baldwin, I. T., & Kim, S.-G. (2016). Trichobaris weevils distinguish amongst toxic hostplants by sensing volatiles that do not affect larval performance. Molecular Ecology, 25(14), 3509-3519. doi:10.1111/mec.13686.

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 Creators:
Lee, Gisuk1, Author              
Joo, Youngsung1, 2, Author              
Diezel, Celia1, Author              
Lee, E. J., Author
Baldwin, Ian Thomas1, Author              
Kim, Sang-Gyu1, Author              
Affiliations:
1Department of Molecular Ecology, Prof. I. T. Baldwin, MPI for Chemical Ecology, Max Planck Society, ou_24029              
2IMPRS on Ecological Interactions, MPI for Chemical Ecology, Max Planck Society, Jena, DE, ou_421900              

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 Abstract: Herbivorous insects use plant metabolites to inform their host plant selection for oviposition. These host-selection behaviours are often consistent with the preference-performance hypothesis; females oviposit on hosts that maximize the performance of their offspring. However, the metabolites used for these oviposition choices and those responsible for differences in offspring performance remain unknown for ecologically relevant interactions. Here, we examined the host-selection behaviours of two sympatric weevils, the Datura (Trichobaris compacta) and tobacco (T. mucorea) weevils in field and glasshouse experiments with transgenic host plants specifically altered in different components of their secondary metabolism. Adult females of both species strongly preferred to feed on D. wrightii rather than on N. attenuata leaves, but T. mucorea preferred to oviposit on N. attenuata, while T. compacta oviposited only on D. wrightii. These oviposition behaviours increased offspring performance: T. compacta larvae only survived in D. wrightii stems and T. mucorea larvae survived better in N. attenuata than in D. wrightii stems. Choice assays with nicotine-free, JA-impaired, and sesquiterpene-over-produced isogenic N. attenuata plants revealed that although half of the T. compacta larvae survived in nicotine-free N. attenuata lines, nicotine did not influence the oviposition behaviours of both the nicotine-adapted and nicotine-sensitive species. JA-induced sesquiterpene volatiles are key compounds influencing T. mucorea females' oviposition choices, but these sesquiterpenes had no effect on larval performance. We conclude that adult females are able to choose the best host plant for their offspring and use chemicals different from those that influence larval performance to inform their oviposition decisions.

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 Dates: 2016-05-052016-06-152016
 Publication Status: Published in print
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 Identifiers: Other: ITB523
DOI: 10.1111/mec.13686
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Title: Molecular Ecology
Source Genre: Journal
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Publ. Info: Oxford : Blackwell Science
Pages: - Volume / Issue: 25 (14) Sequence Number: - Start / End Page: 3509 - 3519 Identifier: ISSN: 0962-1083
CoNE: https://pure.mpg.de/cone/journals/resource/954925580119