Whole Plant Studies Using Radioactive 13-Nitrogen

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Abstract
Nitrogen-13 labelled nitrate and ammonium ions were used to measure uptake and assimilation rates in non-destructive experiments in which the water flux through hydroponically grown maize plants was doubled by changing the ambient humidity. Although no immediate effects on ion uptake were observed, longer term observations showed different patterns of coupling for the uptake parameters for nitrate and for ammonium. The patterns were compared with patterns predicted for different combinations of processes for uptake and for discharge to the xylem. Those which were compatible with the experimental patterns indicated that for nitrate the uptake into the root showed coupling to water flux whereas discharge to the xylem did not. For ammonium there appeared to be coupling to the water flux of both uptake into the root and of discharge to the xylem though it was less evident in the former when the external ammonium ion concentration was low.

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