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Time course of apoplastic NH4+ concentration in leaf discs of oilseed rape infiltrated at 20°C with either 0 mm (•) or 0.8 mm (○) NH4Cl in a 150 mm Mes buffer solution, pH 6.2, adjusted to 350 mosmol with sorbitol. The concentration at time 0 after infiltration with 0 mm NH4Cl was corrected for the NH4+ already present in the apoplast. Values are the means ± se of four replicates.
