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Developmental trajectories in cottonwood phytochemistry


Rehill, BJ and Whitham, TG and Martinsen, GD and Schweitzer, J and Bailey, J and Lindroth, RL, Developmental trajectories in cottonwood phytochemistry, Journal of Chemical Ecology, 32, (10) pp. 2269-2285. ISSN 0098-0331 (2006) [Refereed Article]

DOI: doi:10.1007/s10886-006-9141-9


We examined the hypothesis that ecologically important phytochemical traits differ predictably among various developmental zones of trees (i.e., mature and juvenile zones of individual trees and juvenile ramets that sprout from roots) and that the slope of this phytochemical gradient represents a "developmental trajectory." We focused on Populus fremontii (Fremont cottonwood), P. angustifolia (narrowleaf cottonwood), and their natural hybrids. Two major patterns emerged. First, within narrowleaf and hybrids, concentrations of important phytochemicals (condensed tannins and phenolic glycosides) differ greatly and predictably between developmental zones. Second, developmental trajectories differ greatly among these cottonwood species and their hybrids: Fremont exhibits a flat trajectory, narrowleaf a steep trajectory, and hybrids an intermediate trajectory, suggesting an additive genetic component and an ontogenetic basis to this phytochemical variation. Because diverse herbivorous species respond to the phytochem-istry of their host plants, we predict that the developmental trajectories of plants play a major role in mediating ecological interactions and structuring communities, and that biodiversity in a stand of trees is determined by both interplant genetic diversity and intraplant ontogenetic diversity. © Springer Science + Business Media, Inc. 2006.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Terrestrial ecology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:Schweitzer, J (Dr Jen Schweitzer)
UTAS Author:Bailey, J (Associate Professor Joe Bailey)
ID Code:73663
Year Published:2006
Web of Science® Times Cited:59
Deposited By:Research Division
Deposited On:2011-10-19
Last Modified:2011-10-19

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