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Net uptake of NH4+ from the apoplastic solution in leaf discs of oilseed rape infiltrated for 4 min at 20°C with 150 mm Mes buffer solutions, pH 6.2, adjusted to an osmotic potential of 350 mosmol with sorbitol and different concentrations of NH4Cl. Values are the means ± se of four replicates. FW, Fresh weight.
