In this study were evaluated the interaction of salinity and salicylic acid (SA) on morphological and physiological properties of Sweet basil plants. The experiment was done as factorial arrangement in completely randomized design with three replicates. First factor was salinity (2, 4, 6 and 8 g/L NaCl) and second factor was salicylic acid (50, 100 and 150 mg/L) as spraying and one treatment was considered as control. Results showed that increasing levels of NaCl resulted in reduction of shoot fresh weight; root fresh and dry weight; plant height; number of lateral branches; chlorophyll content and potassium levels and with increasing sodium chloride levels, increased in sodium content. The most effective concentration of SA was 50 mg/L for reduction of salinity effects on evaluated characters. Increasing of SA concentration from 50 to 150 mg/L led to decreasing of fresh and dry weight in shoot and root; plant height; lateral shoot number; chlorophyll and sodium content but potassium content increased.
