Download the full-sized PDF of Aquaporin regulation in poplar and spruce trees under environmental change.Download the full-sized PDF



Permanent link (DOI):


Export to: EndNote  |  Zotero  |  Mendeley


This file is in the following communities:

Graduate Studies and Research, Faculty of


This file is in the following collections:

Theses and Dissertations

Aquaporin regulation in poplar and spruce trees under environmental change. Open Access


Other title
radial water flow
transpirational demand
leaf hydraulic conductance
xylem refilling
root hydraulics
Type of item
Degree grantor
University of Alberta
Author or creator
Laur, Joan
Supervisor and department
Hacke, Uwe G (Department of Renewable Resources)
Examining committee member and department
Maurel, Christophe (UMR Biochimie et Physiologie Moleculaire des plantes - INRA SupAgro - Montpellier - FRANCE)
Comeau, Phil (Department of Renewable Resources)
Scarpella, Enrico (Department of Biological Sciences)
Zwiazek, Janusz (Department of Renewable Resources)
Department of Renewable Resources
Forest Biology and Management
Date accepted
Graduation date
Doctor of Philosophy
Degree level
This dissertation describes a series of experiments that examined: 1) hydraulic responses of Populus trichocarpa x deltoides, Populus trichocarpa and Picea glauca plants to change in their surrounding environment; 2) Changes of aquaporin expression in response to such changes. In the first study, we demonstrated that changes of the transpirational demand is related to fine adjustment of root water uptake that is associated with up-regulation of plasma membrane intrinsic proteins isoforms (PIPs) in hybrid poplar saplings. PIP1 proteins are mostly localized in the endodermis where they may facilitate water movement to the stele. In the second study, we investigated the dynamics of leaf hydraulics in P. trichocarpa saplings exposed to a dehydration-rewatering episode. Fast leaf recovery was associated with an increase in expression of several tonoplast intrinsic proteins isoforms (TIPs) localized in xylem parenchyma. In the third study, we considered the physiological importance of foliar water uptake in P. glauca plants exposed to drought. In order to study the role of aquaporin in needle water uptake, we characterized the aquaporin family in white spruce. Our findings are consistent with the hypothesis that aquaporins facilitate radial water movement from the atmosphere towards the needle vascular tissue, therefore providing an alternate water source for embolism repair in conifers. These results suggest the several roles of aquaporin regulation in the dynamic and fine adjustment of tree-water relations.
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.
Citation for previous publication
J. Laur and U. G. Hacke, “Transpirational demand affects aquaporin expression in poplar roots.” Journal of Experimental Botany, vol. 64, 2283-2293.J. Laur and U. G. Hacke, “Exploring Picea glauca aquaporins in the context of needle water uptake and xylem refilling.” New Phytologist, vol. 203, 388-400

File Details

Date Uploaded
Date Modified
Audit Status
Audits have not yet been run on this file.
File format: pdf (PDF/A)
Mime type: application/pdf
File size: 7678466
Last modified: 2015:10:12 12:36:51-06:00
Filename: Laur_Joan_201407_PhD.pdf
Original checksum: e8b31ea1eaa70e2791843b55d9f05674
Activity of users you follow
User Activity Date