Abstract
The fluid exudation rates and the ionic compositions of the exudates of excised maize roots have been determined in bathing media of o-1 mM, i -o mM, to o mM, and 50-0 mM KC1, each containing o-i mM CaCl2, at temperature intervals between 10 °C and 30 °C. Analysis of these data in terms of an osmotic model for excised root exudation shows that the observed temperature variation in fluid exudation rate is accounted for by the observed temperature variation in the osmotic driving force, the salt concentration difference from xylem fluid to bathing medium. Temperature variation in the osmotic permeability of the root and of the non-osmotic water flow are not significantly different from zero.
Published Version
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