The lipid bilayer and aquaporins: parallel pathways for water movement into plant cells

The plant plasma membrane is the the major barrier to water flow between cells and their surroundings. Water movement across roots involves pathways comprising many cells and their walls. There are three possible pathways which water can follow, (i) a trans-cellular pathway, which involves serial mo...

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Bibliographic Details
Published in:Plant growth regulation 1998-07, Vol.25 (2), p.89-95
Main Authors: Carvajal, M. (Centro de Edafologia y Biologia Aplicada del Segura CSIC, Murcia (Spain).), Cooke, D.T, Clarkson, D.T
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
AGUA
Biological and medical sciences
Cell kinetics
CELL MEMBRANES
Cell physiology
EAU
Economic plant physiology
ESTRES
Fundamental and applied biological sciences. Psychology
MEMBRANAS CELULARES
MEMBRANE CELLULAIRE
Membranes
NUTRIENT TRANSPORT
Plant physiology and development
PLANT VASCULAR SYSTEM
Proteins
SISTEMA VASCULAR DE LA PLANTA
STRESS
SYSTEME VASCULAIRE DES PLANTES
TRANSPORT DES SUBSTANCES NUTRITIVES
TRANSPORTE DE NUTRIENTES
WATER
Water flow
Water relations
Water relations, transpiration, stomata
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Summary:The plant plasma membrane is the the major barrier to water flow between cells and their surroundings. Water movement across roots involves pathways comprising many cells and their walls. There are three possible pathways which water can follow, (i) a trans-cellular pathway, which involves serial movement into and out from radial files of cells, (ii) a symplasmic pathway through the plasmodesmata, which creates a cytoplasmic continuum and (iii) a tortuous, extracellular pathway through the cell walls, the apoplasmic pathway. In each of these pathways water movement across cell membranes occurs at some stage. The possible role of water-channels in membranes is discussed in relation to this movement. The molecular identity of water-channel proteins in plasma membranes of plants has been confirmed but there remain a number of unresolved questions about their role in cell and tissue water relations, their interaction with the lipid components of membranes and the relationship between water movement through membranes by diffusion in the bilayer.[PUBLICATION ABSTRACT]
ISSN:0167-6903
1573-5087
DOI:10.1023/A:1005918305552