Abstract
The terpenoid and phenolic constituents of conifers have been implicated in protecting trees from infestation by bark beetles and phytopathogenic fungi, but it has been difficult to prove these defensive roles under natural conditions. We used methyl jasmonate, a well-known inducer of plant defense responses, to manipulate the biochemistry and anatomy of mature Picea abies (Norway spruce) trees and to test their resistance to attack by Ips typographus (the spruce bark beetle). Bark sections of P. abies treated with methyl jasmonate had significantly less I. typographus colonization than bark sections in the controls and exhibited shorter parental galleries and fewer eggs had been deposited. The numbers of beetles that emerged and mean dry weight per beetle were also significantly lower in methyl jasmonate-treated bark. In addition, fewer beetles were attracted to conspecifics tunneling in methyl jasmonate-treated bark. Stem sections of P. abies treated with methyl jasmonate had an increased number of traumatic resin ducts and a higher concentration of terpenes than untreated sections, whereas the concentration of soluble phenolics did not differ between treatments. The increased amount of terpenoid resin present in methyl jasmonate-treated bark could be directly responsible for the observed decrease in I. typographus colonization and reproduction.
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Acknowledgments
This study was supported by the Norwegian Forest Research Institute, University of California-Berkeley (College of Natural Resources), and the Max Planck Society. Trygve Krekling and Elin Ørmen at the Electron Microscopy Laboratory, Norwegian University of Life Sciences helped with sample processing and microscopy. Torstein Kvamme, Skogforsk, helped with field and lab work. We gratefully acknowledge the permission to utilize trees in the municipal forest in Ås.
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Erbilgin, N., Krokene, P., Christiansen, E. et al. Exogenous application of methyl jasmonate elicits defenses in Norway spruce (Picea abies) and reduces host colonization by the bark beetle Ips typographus . Oecologia 148, 426–436 (2006). https://doi.org/10.1007/s00442-006-0394-3
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DOI: https://doi.org/10.1007/s00442-006-0394-3