Abstract
Summary The extrusion of protons by maize roots was quantitatively and continuously measuredusing a pH-stat method. The proton extrusion showed a daily pattern which correlated with the light regime. The rates of extrusion increased rapidly after about 1 to 2 hours following the onset of illumination and began to decrease 1 to 2 hours after darkening; the absolute rates were dependent upon light intensity and were proportional to the leaf area. It was demonstrated, using a pH indicator technique, that a similar daily pattern was also exhibited by plants grown in sand. Plants transferred from sand into hydroponic culture at different times exhibited similar extrusion kinetics to those grown in hydroponics. It is concluded that, for plants growing in sand supplied with a designated nutrient solution, the kinetics of proton extrusion were similar to those of plants of similar age and leaf area grown in the same nutrient solution.
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