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Linoleic Acid Promotes Emission of Bark Beetle Semiochemicals by Fungal Symbionts
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
Norwegian Inst Bioecon Res, Norway.ORCID iD: 0000-0002-7205-0715
2023 (English)In: Journal of Chemical Ecology, ISSN 0098-0331, E-ISSN 1573-1561, Vol. 49, p. 59-66Article in journal (Refereed) Published
Abstract [en]

Tree-killing bark beetles in conifer forests vector symbiotic fungi that are thought to help the beetles kill trees. Fungal symbionts emit diverse volatile blends that include bark beetle semiochemicals involved in mating and host localization. In this study, all 12 tested fungal isolates emitted beetle semiochemicals when growing in medium amended with linoleic acid. These semiochemicals included the spiroacetals chalcogran, trans-conophthorin and exo-brevicomin, as well as 2-methyl-3-buten-1-ol, the main aggregation pheromone component of the spruce bark beetle Ips typographus. The emission of these compounds was affected by the type of fatty acid present (linoleic vs. oleic acid). Accumulating evidence shows that the fatty acid composition in conifer bark can facilitate colonization by bark beetles and symbiotic fungi, whereas the fatty acid composition of non-host trees can be detrimental for beetle larvae or fungi. We hypothesize that beetles probe the fatty acid composition of potential host trees to test their suitability for beetle development and release of semiochemicals by symbiotic fungi.

Place, publisher, year, edition, pages
Springer, 2023. Vol. 49, p. 59-66
Keywords [en]
Tree-Killing Bark Beetles, Symbiont Fungi, Fatty Acid Composition, Linoleic Acid, Semiochemicals, Pheromones, Spiroacetals
National Category
Organic Chemistry Ecology Forest Science
Research subject
Natural Science, Ecological chemistry
Identifiers
URN: urn:nbn:se:lnu:diva-118750DOI: 10.1007/s10886-022-01400-3ISI: 000906085200001PubMedID: 36585598Scopus ID: 2-s2.0-85145159044OAI: oai:DiVA.org:lnu-118750DiVA, id: diva2:1731312
Available from: 2023-01-26 Created: 2023-01-26 Last updated: 2023-05-10Bibliographically approved

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Unelius, C. RikardGanji, Suresh

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