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Theses and Dissertations

Jack Pine Signalling and Responses to Herbivory Open Access


Other title
conifer defence
inter-plant communication
jack pine
volatile organic chemicals
insect-plant interactions
jack pine budworm
Type of item
Degree grantor
University of Alberta
Author or creator
Lazebnik, Jenny
Supervisor and department
Erbilgin, Nadir (Renewable Resources)
Examining committee member and department
Maya L. Evenden (Biological Sciences)
Lloyd Dosdall (Agricultural, Food and Nutritional Science)
James C. Cahill (Biological Sciences)
John Spence (Renewable Resources)
Department of Renewable Resources
Forest Biology and Management
Date accepted
Graduation date
Master of Science
Degree level
Intra and inter-plant signalling was investigated in jack pine (Pinus banksiana) seedlings in response to jack pine budworm (Choristoneura pinus, Lepidoptera: Tortricidae) feeding. Defoliation was followed by a fungal inoculation by blue stain fungus (Grosmannia clavigera) to assess resistance. Results from greenhouse experiments showed that: 1) intra-plant signalling was mediated by intensity of larval defoliation, 2) intra-plant signalling was not observed with mechanical wounding 3) seedling resistance to a fungal pathogen depended on type of defoliation before inoculation, and 4) volatile-exposure from defoliated seedlings could mediate resistance to subsequent fungal infection. In mature jack pine stands in Ontario, needle monoterpene concentrations decreased on budworm defoliated and nearby branches. Monoterpene concentration in the phloem of mature trees was higher in trees with high budworm infestation. This research contributed to the understanding of inducible responses and volatile signalling in conifer systems. Effects of herbivory on jack pine were investigated though analysis of volatile and tissue monoterpenes, known to mediate multi-organismal ecological interactions.
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