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Published on February 24, 2002; 10.1104/pp.010791

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Received August 28, 2001
Accepted September 3, 2001

Ethylene Enhances Water Transport in Hypoxic Aspen

Mohammed Kamaluddin and Janusz J. Zwiazek *

Department of Renewable Resources, 4--42 Earth Sciences Building, University of Alberta, Edmonton, Alberta, Canada T6G 2E3

* Corresponding author; email: janusz.zwiazek{at}ualberta.ca.

Water transport was examined in solution culture grown seedlings of aspen (Populus tremuloides) after short-term exposures of roots to exogenous ethylene. Ethylene significantly increased stomatal conductance, root hydraulic conductivity (Lp), and root oxygen uptake in hypoxic seedlings. Aerated roots that were exposed to ethylene also showed enhanced Lp. An ethylene action inhibitor, silver thiosulphate, significantly reversed the enhancement of Lp by ethylene. A short-term exposure of excised roots to ethylene significantly enhanced the root water flow (Qv), measured by pressurizing the roots at 0.3 MPa. The Qv values in ethylene-treated roots declined significantly when 50 µM HgCl2 was added to the root medium and this decline was reversed by the addition of 20 mM 2-mercaptoethanol. The results suggest that the response of Qv to ethylene involves mercury-sensitive water channels and that root-absorbed ethylene enhanced water permeation through roots, resulting in an increase in root water transport and stomatal opening in hypoxic seedlings.




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