Journal of Experimental Botany, Vol 50, 1055-1071, Copyright © 1999 by Oxford University Press
S Tyerman, H Bohnert, C Maurel, E Steudle and J Smith
Over the last decade, considerable advances have occurred in understanding
the molecular biology and biophysics of water permeation across plant
membranes and tissues. Spurred on by the rapid advances in cloning and
functional characterization of a super-family of major intrinsic proteins,
some of which function as aquaporins, the biophysics of transport of water
and small non-electrolytes across plant membranes is being re-examined
based on the proposed function of these membrane-integral proteins in their
native membranes. This review focuses on a number of issues that are
central to an understanding of aquaporin function: (1) the need to be able
to test for water-channel activity in native membranes; (2) the
implications of the observed solute/water selectivity of aquaporins; (3)
the putative functional roles of aquaporins at the cell, tissue and organ
levels in plants; and (4) information that can be obtained from studies of
the abundance, diversity and expression patterns of aquaporins. It is clear
that to answer many of the critical questions that remain concerning
aquaporin function, combined studies using appropriate molecular and
biophysical techniques will be required.Keywords:
Aquaporin, hydraulic conductivity, major intrinsic protein,
osmotic flow, water channel, water permeability.
ARTICLES
Plant acuaporins: their molecular biology, biophysics and significance for plant water relations
School of Biological Sciences, Flinders University of South Australia, GPO Box 2100, Adelaide, South Australia 5001, Australia; Departments of Biochemistry, Molecular and Cellular Biology, and Plant Sciences, University of Arizona, Tucson, Arizona 85721, USA; Institut des Sciences Végétales, CNRS, Avenue de la Terasse, F-91198 Gif-sur-Yvette, France; Lehrstuhl fur Pflanzenokologie, Universitat Bayreuth, Universitatsstrasse 30, D-95440 Bayreuth, Germany; Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK; Corresponding author; Fax: +61 8 8201 3015; E-mail: bisdt@flinders.edu.au
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