Xylem sap ABA and leaf ethylene followed the same trend,increasing significantly with increasing NaCl levels in the growth medium in both the salt-tolerant (Indent-1) and salt-sensitive(salt-sensitive) genotypes (Fig. 4). There was significant difference between genotypes. Increasing potassium concentration (4.5 mM)in the growth medium had a significant negative effect on ABA andethylene concentrations at 75 and 150 mM NaCl.