Figure 3.

Inhibition of unidirectional influx of Na⁺ (in micromoles per gram per minute) into excised roots of Arabidopsis from 50 mm NaCl with increasing Ca²⁺ activity. Roots were either pretreated for 3 h in sorbitol before influx (white circles), or fluxes were performed after only 10 min of equilibration in non-radioactive influx solution (black circles). Data represent means, and error bars the se (n = 4 with sorbitol, n = 8 without sorbitol).