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Methyl Jasmonate-Induced Monoterpenes in Scots Pine and Norway Spruce Tissues Affect Pine Weevil Orientation
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.ORCID iD: 0000-0003-2867-2004
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2016 (English)In: Journal of Chemical Ecology, ISSN 0098-0331, E-ISSN 1573-1561, Vol. 42, no 12, p. 1237-1246Article in journal (Refereed) Published
Abstract [en]

In large parts of Europe, insecticide-free measures for protecting conifer plants are desired to suppress damage by the pine weevil Hylobius abietis (L.). Treatment with methyl jasmonate (MeJA), a chemical elicitor already used in crop production, may enhance expression of chemical defenses in seedlings in conifer regenerations. However, in a previous experiment, MeJA treatment resulted in substantially better field protection for Scots pine (Pinus sylvestris L.) than for Norway spruce (Picea abies (L.) Karst.). Hypothesizing that the variations may be at least due partly to volatiles released by MeJA-treated seedlings and their effects on pine weevil orientation, we examined tissue extracts of seedlings (from the same batches as previously used) by two-dimensional GC-MS. We found that the MeJA treatment increased contents of the monoterpene (-)-beta-pinene in phloem (the weevil's main target tissue) of both tree species, however, the (-)-beta-pinene/(-)-alpha-pinene ratio increased more in the phloem of P. sylvestris. We also tested the attractiveness of individual monoterpenes found in conifer tissues (needles and phloem) for pine weevils using an arena with traps baited with single-substance dispensers and pine twigs. Trap catches were reduced when the pine material was combined with a dispenser releasing (-)-beta-pinene, (+)-3-carene, (-)-bornyl acetate or 1,8-cineole. However, (-)-alpha-pinene did not have this effect. Thus, the greater field protection of MeJA-treated P. sylvestris seedlings may be due to the selective induction of increases in contents of the deterrent (-)-beta-pinene, in contrast to strong increases in both non-deterrent (-)-alpha-pinene and the deterrent (-)-beta-pinene in P. abies seedlings.

Place, publisher, year, edition, pages
Springer-Verlag New York, 2016. Vol. 42, no 12, p. 1237-1246
Keywords [en]
Hylobius abietis, Pinus sylvestris, Picea abies, Monoterpenes, Methyl jasmonate, Enantiomers
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-199752DOI: 10.1007/s10886-016-0790-zISI: 000390040400004Scopus ID: 2-s2.0-84997606168OAI: oai:DiVA.org:kth-199752DiVA, id: diva2:1067711
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QC 20170123

Available from: 2017-01-23 Created: 2017-01-16 Last updated: 2017-11-29Bibliographically approved

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Lundborg, LinaBorg-Karlson, Anna-Karin

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