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Transpirational demand affects aquaporin expression in poplar roots
1University of Alberta, Department of Renewable Resources, 4-42 Earth Sciences Building, Edmonton, AB, Canada.
Woody plants dynamically adjust root water uptake to maintain water potential. Hybrid poplar roots showed increased water flow and aquaporin gene expression, aiding recovery from water stress.
Area of Science:
- Plant Physiology
- Plant Water Relations
- Molecular Biology
Background:
- Isohydric plants regulate water potential mainly through stomatal closure.
- Emerging evidence suggests plants also dynamically adjust water uptake.
- Aquaporins play a key role in root hydraulic adjustments, but woody plant responses are understudied.
Purpose of the Study:
- To investigate root hydraulic responses to altered transpirational demand in hybrid poplar.
- To measure aquaporin gene expression and correlate it with root water flow (Q R) and water relations.
- To understand the role of root water uptake in maintaining water potential homeostasis in woody plants.
Main Methods:
- Hybrid poplar plants were subjected to increased light or decreased relative humidity to simulate higher transpirational demand.
- Stem water potential, root water flow (Q R), and stomatal conductance were measured.
- Expression levels of PIP1 and PIP2 aquaporin genes were analyzed.
Main Results:
- Plants experienced a transient drop in stem water potential, followed by recovery within 28 hours.
- Recovery was linked to increased Q R and altered expression of PIP1 and PIP2 aquaporin genes.
- Plants acclimated to high humidity showed larger stomata and incomplete closure, suggesting Q R increase was crucial for water potential recovery.
Conclusions:
- Hybrid poplar roots dynamically adjust water uptake to maintain water potential homeostasis.
- Aquaporin gene expression changes correlate with root hydraulic adjustments.
- Root water uptake modulation is a significant mechanism for water stress recovery in woody plants.
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