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The Plant Cell, Vol. 14, 727-739, March 2002, Copyright © 2002,
American Society of Plant Biologists

Plasma Membrane Aquaporins in the Motor Cells of Samanea saman

Diurnal and Circadian Regulation

Menachem Mosheliona, Dirk Beckerb, Alexander Bielab, Norbert Uehleinb, Rainer Hedrichb, Beate Ottob, Hadas Levia, Nava Moran1,a and Ralf Kaldenhoffb

a Department of Agricultural Botany, Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agricultural, Food, and Environmental Quality Sciences, the Hebrew University of Jerusalem, Rehovot 76100, Israel
b Julius-von-Sachs-Insitute, Department of Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Platz 2, D97082 Wuerzburg, Germany

1 To whom correspondence should be addressed. E-mail nava.moran{at}huji.ac.il; fax 972-8-946-7763

Leaf-moving organs, remarkable for the rhythmic volume changes of their motor cells, served as a model system in which to study the regulation of membrane water fluxes. Two plasma membrane intrinsic protein homolog genes, SsAQP1 and SsAQP2, were cloned from these organs and characterized as aquaporins in Xenopus laevis oocytes. Osmotic water permeability (Pf) was 10 times higher in SsAQP2-expressing oocytes than in SsAQP1-expressing oocytes. SsAQP1 was found to be glycerol permeable, and SsAQP2 was inhibited by 0.5 mM HgCl2 and by 1 mM phloretin. The aquaporin mRNA levels differed in their spatial distribution in the leaf and were regulated diurnally in phase with leaflet movements. Additionally, SsAQP2 transcription was under circadian control. The Pf of motor cell protoplasts was regulated diurnally as well: the morning and/or evening Pf increases were inhibited by 50 µM HgCl2, by 2 mM cycloheximide, and by 250 µM phloretin to the noon Pf level. Our results link SsAQP2 to the physiological function of rhythmic cell volume changes.




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