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Net NH4+ (a) and NO3− (b) fluxes along the root tip of T. ascendens, T. distichum, and T. mucronatum. Bars indicate standard errors (n = 8). Net influxes correspond to positive values, and negative values indicate net effluxes, respectively. The concentrations of N were set as 1.0 mM NH4Cl for NH4+ or 1.0 mM KNO3 for NO3−. T. a, T. d, and T. m represent T. ascendens, T. distichum and T. mucronatum, respectively.
