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Infestation by a Nalepella species induces emissions of alpha- and beta-farnesenes, (-)- linalool and aromatic compounds in Norway spruce clones of different susceptibility to the large pine weevil
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. (Ecological Chemistry Group)
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. (Ecological Chemistry Group)
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. (Ecological Chemistry Group)
2008 (English)In: Arthropod-Plant Interactions, ISSN 1872-8855, Vol. 2, no 1, 31-41 p.Article in journal (Refereed) Published
Abstract [en]

The emissions of spruce grafts (Picea abies), caused by infestation of an acarid species of the genus Nalepella were investigated. Volatiles of three clones, both healthy and infested, with different susceptibility to the large pine weevil Hylobius abietis were collected by solid phase micro extraction (SPME) and analyzed by gas chromatograph coupled to mass-spectrometry (GC-MS). In addition, enantiomers of the main chiral compounds were separated by a two dimensional-gas chromatograph (2D-GC). In the characteristic flower-like fragrances emitted by the infested grafts large amounts of E-beta-farnesene, E, E-alpha-farnesene, (-)-linalool, methyl salicylate and minute amounts of benzyl alcohol, E-anethole, methyl benzoate, neral and geranial were found. All together, these compounds could explain the characteristic scent emitted by the infested seedlings. Large differences in the emissions of E-beta-farnesene, E, E-alpha-farnesene and methyl salicylate were found between but not within the clones.

Place, publisher, year, edition, pages
2008. Vol. 2, no 1, 31-41 p.
Keyword [en]
Nalepella; Picea; Infestation; Farnesene; Methyl salicylate; Linalool; Neral; Stress
National Category
Organic Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-17983DOI: 10.1007/s11829-008-9029-4ISI: 000260961100004Scopus ID: 2-s2.0-41149104564OAI: oai:DiVA.org:kth-17983DiVA: diva2:336028
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2010-08-18Bibliographically approved
In thesis
1. Volatiles of Conifer Seedlings: Compositions and Resistance Markers
Open this publication in new window or tab >>Volatiles of Conifer Seedlings: Compositions and Resistance Markers
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Pine weevils cause major damage to newly planted conifer seedlings in reforestation areas. However, recent findings indicate that small (“mini”) seedlings, planted at the age of 7-10 weeks, are gnawed less by pine weevils than the larger, conventionally planted seedlings. Thus, it has been proposed that planting young conifer seedlings in clear-cut areas may reduce the damage caused by pine weevils. In attempts to determine why mini seedlings appear to be less damaged by pine weevils than “conventional” seedlings, the volatiles released by Norway spruce and Scots pine mini seedlings were investigated, since such chemicals are of great importance in herbivore-plant communication, inter alia acting as repellents, attractants or antifeedants.

Volatiles from the seedlings were collected, separated and identified by solid phase microextraction (SPME) followed by gas chromatography-mass spectrometry.

The results show that there are high levels of chemodiversity among both spruce and pine seedlings. Between-tissue and age-related variations in their emissions were also found.

Norway spruce clones infested by mites were also examined to assess genotype- and pest-specific stress reactions of Norway spruce. Finally, the effects of certain spruce defense compounds on the behavior of the large pine weevil Hylobius abietis were examined.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. 51 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2008:34
Keyword
Conifers, Norway spruce, Scots pine, Nalepella, Oligonychus ununguis, green leaf volatiles, terpenes, aromatics, benzenoids, SPME, induced defense reaction
National Category
Organic Chemistry
Identifiers
urn:nbn:se:kth:diva-4723 (URN)978-91-7178-962-4 (ISBN)
Public defence
2008-05-19, F3, Lindstedtsvägen 26, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100818Available from: 2008-05-06 Created: 2008-05-06 Last updated: 2010-08-18Bibliographically approved

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