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Induced monoterpene responses in jack pine: defence against jack pine budworm and a fungal associate of the mountain pine beetle Open Access


Other title
jack pine
induced responses
jack pine budworm
Grosmannia clavigera
tree-mediated interactions
mountain pine beetle
Type of item
Degree grantor
University of Alberta
Author or creator
Colgan, Lindsay Jessica
Supervisor and department
Erbilgin, Nadir (Renewable Resources)
Examining committee member and department
Volney, Jan (Canadian Forest Service)
Evenden, Maya (Biological Sciences)
Spence, John (Renewable Resources)
Blenis, Peter (Renewable Resources)
Department of Renewable Resources

Date accepted
Graduation date
Master of Science
Degree level
My thesis research investigated monoterpene responses in jack pine (Pinus banksiana Lamb.) to different agents to better understand how these responses may influence the spread of the mountain pine beetle (Dendroctonus ponderosae Hopkins; MPB) in the boreal forest. The results support that monoterpenes are inducible responses in jack pine. In the first study, methyl jasmonate application elicited the greatest response in juvenile and mature trees suggesting that jasmonic acid plays a role in jack pine defence responses. In the cross-induction study, I found evidence of an increase in resistance to Grosmannia clavigera with prior jack pine budworm defoliation (Choristoneura pinus pinus Freeman; JPBW). In contrast, needle monoterpenes greatly increased after G. clavigera inoculation and continued to increase during JPBW defoliation; however, JPBW increased its feeding rate to compensate for a change in host quality. Overall, monoterpene induction in jack pine depended on the agent(s) involved and their order. The systemic responses that were observed may have implications for MPB spread in the boreal forest.
License granted by Lindsay Colgan ( on 2010-08-25T19:48:53Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File title: Mountain Pine Beetle and Jack Pine Budworm: Two Outbreak Species Colliding in Western Canada
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