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First published online December 10, 2004; 10.1104/pp.104.051045

Plant Physiology 137:341-353 (2005)
© 2005 American Society of Plant Biologists

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ENVIRONMENTAL STRESS AND ADAPTATION

The Role of Aquaporins and Membrane Damage in Chilling and Hydrogen Peroxide Induced Changes in the Hydraulic Conductance of Maize Roots1,2

Ricardo Aroca*, Gabriela Amodeo3, Silvia Fernández-Illescas, Eliot M. Herman, François Chaumont and Maarten J. Chrispeels

Division of Biological Sciences, University of California at San Diego, La Jolla, California, 92093–0116 (R.A., G.A., M.J.C.); Physiological Biochemistry Unit, Université Catholique de Louvain, B–1348 Louvain-La-Neuve, Belgium (S.F.-I., F.C.); and Plant Genetics Research Unit, United States Department of Agriculture-Agricultural Research Service, Donald Danforth Plant Science Center, St. Louis, Missouri, 63132 (E.M.H.)

When chilling-sensitive plants are chilled, root hydraulic conductance (Lo) declines precipitously; Lo also declines in chilling-tolerant plants, but it subsequently recovers, whereas in chilling-sensitive plants it does not. As a result, the chilling-sensitive plants dry out and may die. Using a chilling-sensitive and a chilling-tolerant maize genotype we investigated the effect of chilling on Lo, and its relationship to osmotic water permeability of isolated root cortex protoplasts, aquaporin gene expression, aquaporin abundance, and aquaporin phosphorylation, hydrogen peroxide (H2O2) accumulation in the roots and electrolyte leakage from the roots. Because chilling can cause H2O2 accumulation we also determined the effects of a short H2O2 treatment of the roots and examined the same parameters. We conclude from these studies that the recovery of Lo during chilling in the chilling-tolerant genotype is made possible by avoiding or repairing membrane damage and by a greater abundance and/or activity of aquaporins. The same changes in aquaporins take place in the chilling-sensitive genotype, but we postulate that membrane damage prevents the Lo recovery. It appears that the aquaporin response is necessary but not sufficient to respond to chilling injury. The plant must also be able to avoid the oxidative damage that accompanies chilling.

1 This work was supported by the Ministerio de Educación y Ciencia (postdoctoral fellowship to R.A.) and by the Belgian Fund for Scientific Research and the Interuniversity Attraction Poles Programme-Belgian Science Policy (grants to F.C.).

2 This is the 70th research paper from the Chrispeels laboratory to be published in Plant Physiology.

3 Permanent address: Laboratorio de Biomembranas, Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires, 1121 Buenos Aires, Argentina.

Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.104.051045.

* Corresponding author; e-mail raroca{at}biomail.ucsd.edu; fax 858–534–4052.

Received August 2, 2004; returned for revision September 27, 2004; accepted October 22, 2004.


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