Effect of salinity on maize leaf growth. A. spatial distribution of REGR along the elongation zone of the leaf. The colored ovals on the x axis represent the two sections of the growing tissue sampled for the SSH analysis. Data were evaluated from prick hole marking experiments of leaf 4 of maize. If not shown, error bars are smaller than the symbol size. B. A photo of leaf 4 of maize from control (top-image) and salt-stressed plants (bottom-image) at the time of sampling for the physiological analysis and SSH analysis. The plants were grown at 1 mM NaCl (control) or 80 mM NaCl (salt).