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A, Membrane potential of epidermal root cells of salt-tolerant ‘ZUG293’ and salt-sensitive ‘Gairdner’ measured in response to 80 mm NaCl treatment (at arrow). Means ± se (n = 6). B, Steady-state membrane potential (Em) values in control (prior to NaCl treatment) and after 20 min root exposure to 80 mm NaCl. Means ± se (n = 10).
