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Effect of iso-osmotic NaCl or sorbitol treatments on segmental relative elongation rates (RER) in maize roots. Plants were treated for 3 h with either 150 mm NaCl, 300 mm sorbitol or 300 mm sorbitol + 50 µm DPI. (A) RER for each segment plotted against the initial position of the mark on the root closest to the apex. (B) Profiles of RER obtained by fitting sixth-order polynomials to the data points. Data from six control roots and from seven samples for each stress treatment.
