Abstract
Diurnal courses of nutrient transport in the xylem and their response to external availability of nutrients were studied. Stringently nutrient conditions were established in a novel pressure chamber. An aeroponic nutrient delivery system inside allows to sample xylem sap from intact plants under full control of the nutrient conditions at the root. Analysis of xylem transport under these highly defined conditions established that (1) diurnal variations in concentrations and fluxes in the xylem are dominated by plant internal processes. (2) Nitrate uptake and nitrate flux to the shoot are largely uncoupled. (3) In continuous light, diurnal variations of xylem sap concentrations vanish. Step changes in nitrate concentrations of the nutrient solution established that (4) the concomitant increase in nitrate concentration and flux in the xylem is delayed by 2–3 hours and is only transient.
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