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

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

Author(s) -

Edward Newman

Publication year - 1976

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.57.5.738

Subject(s) - xylem , osmotic pressure , compartment (ship) , permeability (electromagnetism) , pressure gradient , drag , osmosis , chemistry , biophysics , water flow , mechanics , botany , soil science , biology , environmental science , geology , biochemistry , physics , membrane , oceanography

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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