Changes in NO Availability and Transpiration Rate Are Associated With a Rapid Diurnal Adjustment of Anion Contents as Well as N and Water Fluxes Between the Roots and Shoots.

Understanding interactions between water and nitrate fluxes in response to nitrate availability and transpiration rate is crucial to select more efficient plants for the use of water and nitrate. Some of these interactions were investigated in intact plants by combining a non-destructive gravimetric device with NO labeling. The set-up allowed high-resolution measurement of the effects of a cross-combination of two concentrations of KNO or KCl (0.