Abstract
Salt stress is a major environmental constraint limiting plant productivity. Tomato ( Lycopersicum esculentum) is one of the commodity vegetable that has recently been added to the list of the world's major food crops and is considered as one of the most popular vegetable. An experiment was conducted to study the effect of salicylic acid (SA) on tomato varieties grown in different levels of salt stress. Salicylic acid (SA) is a plant growth promoting compound relatively inexpensive and enhances growth and yield of crops under saline conditions. The effect of exogenous salicylic acid (25μM) application of with four NaCl concentrations (50mM,100mM, 150mM and 200mM) stressed tomato varieties was investigated. Results on some morphological parameters as plant-height and number of leaves revealed that, salt stressreduced plant-height and number of leaves. While, exogenous application of salicylic acid promoted plant-height and number of leaves and counteracted the salt stress-induced inhibition of plant-height and number of leaves.
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