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The inducibility and kinetics of the NO3-, NO2-, and NH4+ transporters in roots of wheat seedlings (Triticum aestivum cv Yercora Rojo) were characterized using precise methods approaching constant analysis of the substrate solutions.  A microcomputer-controlled automated high performance liquid chromatography system was used to determine the depletion of each N species (initially at 1 millimolar) from complete nutrient solutions.  Uptake rate analyses were performed using computerized curve-fitting techniques.  More precise estimates were obtained for the time required for the extent of the induction of each transporter.  Up to 10 and 6 hours, respectively, were required to achieve apparent full induction of the NO3- and NO2- transporters.  Evidence for substrate inducibility of the NH4+ transporters requiring 5 hours is presented.  The transport of NO3- was mediated by a dual system (or dual phasic), whereas only single systems were found for transport of NO2- and NH4+.  The Km values for NO3-, NO2-, and NH4+ were, respectively, 0.027, 0.054, and 0.05 millimolar.  The Km for mechanism II of NO3- transport could not be defined in this study as it exhibited only apparent first order kinetics up to 1 millimolar.

plant physiology

The Uptake of NO3−, NO2−, and NH4+ by Intact Wheat (Triticum aestivum) Seedlings