Figure 5.

The effect of a 3-h pretreatment in iso-osmotic sorbitol, polyethylene glycol (PEG), or 50 mm NaCl (Na pretr) or 12 d of growth in 50 mm NaCl (Na-grown), on unidirectional influx of Na⁺ into excised roots of Arabidopsis. Data represent means, and error bars the se (n = 4). Numbers below the graph represent the percentage of total influx that was sensitive to external Ca²⁺, calculated according to the formula: [(influx at 0.05 mm Ca²⁺ - influx at 1 mm Ca²⁺)/influx at 0.05 mm Ca²⁺] * 100.