An experiment was conducted to investigate the effects of zinc application and salinity stress (0, 33, 66 and 99 mM NaCl) on some
morphological and physiological parameters of soybean (Glycine max L., var. Williams). Results showed that zinc application
improved shoot length, root fresh and dry weight and shoot fresh and dry weight under all salinity treatments. The catalase (CAT),
ascorbate peroxidase (APX), polyphenoloxidase (PPO) and peroxidase activity (POD) and also proline content increased as a result
of salinity stress. Lipid peroxidation and hydrogen peroxide concentration under the highest salinity were significantly greater than
those under other treatments. However, lipid peroxidation and hydrogen peroxide concentration under salinity treatments
significantly reduced as a result of zinc application. Zinc may act as a scavenger of ROS for mitigating the injury on biomembranes
under salt stress. Adequate zinc also prevents uptake and accumulation of Na in shoot, by increasing membrane integrity of root
cells.
