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Permanent link (DOI): https://doi.org/10.7939/R3Q927

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Diverting Resources to Turn on Resistance: Influences of Biotic and Abiotic Stresses on Aspen Seedlings Open Access

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Other title
Subject/Keyword
defoliator deterrence
Populus tremuloides
carbon nutrient balance hypothesis
Malacosoma disstria
phenolic glycosides
aspen reserves
growth differentiation balance hypothesis
plant defense theories
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Najar, Ahmed
Supervisor and department
Erbilgin, Nadir (Renewable Resources)
Landhausser, Simon (Renewable Resources)
Examining committee member and department
Landhausser, Simon (Renewable Resources)
Evenden, Maya (Biological Sciences)
Erbilgin, Nadir (Renewable Resources)
Roland, Jens (Biological Sciences)
Miles, Dick (Renewable Resources)
Department
Department of Renewable Resources
Specialization
Forest Biology and Management
Date accepted
2012-09-18T13:32:33Z
Graduation date
2012-09
Degree
Master of Science
Degree level
Master's
Abstract
The interactions between biotic and abiotic stresses and their influence on plant reserves in non-photosynthetic tissues (i.e., roots and stems) and the role of plant reserves in tree defenses are poorly understood. Aspen seedlings grown under different conditions (light, fertilizer) were grouped in three groups based on their nutrient and carbohydrate reserves. After dormancy, half of the seedlings in each group were subjected to feeding by forest tent caterpillar (Malacosoma disstria). We analyzed foliar and reserve chemistry and explained their effects on plant defenses and larval performance. We found that reserve TNC and nutrients can affect foliar TNC, Nitrogen, Carbon/Nitrogen ratio, defense chemistry, and the overall plant response to herbivory. Seedlings with high carbohydrate-to-nutrient reserve ratio had the greatest induction of defensive compounds and sustained the lowest insect damage. This study highlights the importance of plant defenses mediating the intricate relationship between plants and herbivores.
Language
English
DOI
doi:10.7939/R3Q927
Rights
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 these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before 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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