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Styrene, (+)-trans-(1R,4S,5S)-4-Thujanol and Oxygenated Monoterpenes Related to Host Stress Elicit Strong Electrophysiological Responses in the Bark Beetle Ips typographus
Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences. Swedish University of Agricultural Sciences, Sweden.
Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences.ORCID iD: 0000-0001-7158-6393
Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences.ORCID iD: 0000-0002-8849-9883
Bahauddin Zakariya Univ, Pakistan;Czech Univ Life Sci Prague, Czech Republic.
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2019 (English)In: Journal of Chemical Ecology, ISSN 0098-0331, E-ISSN 1573-1561, Vol. 45, no 5-6, p. 474-489Article in journal (Refereed) Published
Abstract [en]

Bark beetles kill apparently vigorous conifers during epidemics by means of pheromone-mediated aggregation. During non-endemic conditions the beetles are limited to use trees with poor defense, like wind-thrown. To find olfactory cues that help beetles to distinguish between trees with strong or weak defense, we collected volatiles from the bark surface of healthy felled or standing Picea abies trees. Furthermore, living trees were treated with methyl jasmonate in order to induce defense responses. Volatiles were analyzed by combined gas chromatography and electroantennographic detection (GC-EAD) on Ips typographus antennae. Compounds eliciting antennal responses were characterized by single sensillum recording for identification of specific olfactory sensory neurons (OSN). Release of monoterpene hydrocarbons decreased, while oxygenated compounds increased, from spring to early summer in felled trees. In both beetle sexes particular strong EAD activity was elicited by trace amounts of terpene alcohols and ketones. 4-Thujanol gave a very strong response and the absolute configuration of the tested natural product was assigned to be (+)-trans-(1R,4S,5S)-thujanol by stereoselective synthesis and enantioselective gas chromatography. One type of OSN responded to all ketones and five other OSN were characterized by the type of compounds that elicited responses. Three new OSN classes were found. Of the eight EAD-active compounds found in methyl jasmonate-treated bark, the known anti-attractant 1,8-cineole was the one most strongly induced. Our data support the hypothesis that highly active oxygenated host volatiles could serve as positive or negative cues for host selection in I. typographus and in other bark beetles.

Place, publisher, year, edition, pages
Springer, 2019. Vol. 45, no 5-6, p. 474-489
Keywords [en]
Oxygenated monoterpenes, Styrene, 4-thujanol, GC-EAD, Single-sensillum recordings, SSR, Host chemistry, Plant defense
National Category
Chemical Sciences Ecology
Research subject
Natural Science, Ecological chemistry
Identifiers
URN: urn:nbn:se:lnu:diva-86888DOI: 10.1007/s10886-019-01070-8ISI: 000471639800006PubMedID: 31053976Scopus ID: 2-s2.0-85065316824OAI: oai:DiVA.org:lnu-86888DiVA, id: diva2:1337892
Available from: 2019-07-18 Created: 2019-07-18 Last updated: 2019-08-29Bibliographically approved

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Schiebe, ChristianUnelius, C. RikardGanji, Suresh

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