NaCl (75 and 150 mM) significantly decreased stomatal conductance (gs) in salt-sensitive genotype (Red Ball), whereas the effect of NaCl was significant in salt-tolerant genotype (Indent-1) only with-out potassium (Fig. 2). Without potassium there was no difference between the two genotypes at NaCl levels (75 and 150 mM), how-ever it was significant when adding potassium. Effect of potassium was highly significant in only salt-tolerant genotype.