Stomatal morphological features were measured in terms of guard cell length (Ls) and width (Ws), stomatal pore aperture length(La) and width (Wa) (data not shown), stomatal density (SD) and stomatal aperture (SA) (Fig. 3). Increasing NaCl concentration in the growth medium caused a significant decrease in all the stomatal morphological features in both the salt-tolerant (Indent-1) and salt-sensitive (Red Ball) genotype, except Ls which only decreased at the highest level of NaCl (150 mM) in Indent-1. There was no difference between the genotypes without NaCl, however the effect was significant when adding NaCl especially in case of Ls, Ws, La and Wa, whereas there was no effect across the NaCl levels in case of SD and SA. Potassium application had no significant effect on stomatal morphological features