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Convergent evolution of semiochemicals across Kingdoms: bark beetles and their fungal symbionts
Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences. KTH Royal Instute of Technology, Sweden;Örebro University, Sweden. (Ecological Chemistry)
Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences.ORCID iD: 0000-0002-8849-9883
Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences. University of Western Australia, Australia.
University of Adelaide, Australia.
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2019 (English)In: The ISME Journal, ISSN 1751-7362, E-ISSN 1751-7370, Vol. 13, no 6, p. 5-1545Article in journal (Refereed) Published
Abstract [en]

Convergent evolution of semiochemical use in organisms from different Kingdoms is a rarely described phenomenon. Treekilling bark beetles vector numerous symbiotic blue-stain fungi that help the beetles colonize healthy trees. Here we show for the first time that some of these fungi are able to biosynthesize bicyclic ketals that are pheromones and other semiochemicals of bark beetles. Volatile emissions of five common bark beetle symbionts were investigated by gas chromatography-mass spectrometry. When grown on fresh Norway spruce bark the fungi emitted three well-known bark beetle aggregation pheromones and semiochemicals (exo-brevicomin, endo-brevicomin and trans-conophthorin) and two structurally related semiochemical candidates (exo-1,3-dimethyl-2,9-dioxabicyclo[3.3.1]nonane and endo-1,3-dimethyl-2,9-dioxabicyclo[3.3.1] nonane) that elicited electroantennogram responses in the spruce bark beetle Ips typographus. When grown on malt agar with 13C D-Glucose, the fungus Grosmannia europhioides incorporated 13C into exo-brevicomin and trans-conophthorin. The enantiomeric compositions of the fungus-produced ketals closely matched those previously reported from bark beetles. The production of structurally complex bark beetle pheromones by symbiotic fungi indicates cross-kingdom convergent evolution of signal use in this system. This signaling is susceptible to disruption, providing potential new targets for pest control in conifer forests and plantations.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019. Vol. 13, no 6, p. 5-1545
National Category
Chemical Sciences Ecology
Research subject
Natural Science, Ecological chemistry
Identifiers
URN: urn:nbn:se:lnu:diva-71867DOI: 10.1038/s41396-019-0370-7ISI: 000468529400012PubMedID: 30770902Scopus ID: 2-s2.0-85061750036OAI: oai:DiVA.org:lnu-71867DiVA, id: diva2:1193744
Available from: 2018-03-27 Created: 2018-03-27 Last updated: 2019-08-29Bibliographically approved

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Zhao, TaoGanji, SureshBohman, BjörnUnelius, C. Rikard

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