Plant Physiol. Drug Metab Dispos
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Plant Physiology 57:738-739 (1976)
© 1976 American Society of Plant Biologists

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Interaction between Osmotic- and Pressure-induced Water Flow in Plant Roots

Edward I. Newman

1 Department of Botany, University of Bristol, Bristol BS8 1UG, England

When the pressure gradient across a root alters, there is often an apparent change in the permeability of the root to water. Fiscus (Plant Physiol. 1975. 55: 917-922) has suggested that this can be explained by a simple two-compartment model which takes into account rates of solute uptake into the xylem. A method of testing actual data against the Fiscus model is proposed; this shows that in some cases the apparent changes in permeability cannot be explained by the model. The model is not adequate to predict the amounts of solute reaching the xylem by passive drag: a three-compartment model would be more realistic.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1976 by the American Society of Plant Biologists