Correlation of Water Uptake and Root Exudation

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Abstract
Water uptake in systems consisting of a potted plant and two embedded reservoirs were monitored over test intervals that lasted more than a year. One reservoir was fitted with a microporous bottom that allowed water uptake to occur only after permeation through the thin microporous barrier, whereas the other was fitted with a microporous bottom that allowed water to reach the roots directly. In each study the patterns for water uptake, F1 and F2, from the alternate sources fluctuated in synchrony, such that the ratio F1/F2 on any given day was essentially constant. It was concluded that the cyclic actions that control water uptake and water permeation (i.e. root exudation of bio-surfactants) occur simultaneously or sequentially within a short time period. Both responses, therefore, are appropriate means for studying plant-water relationships.

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