In most parts of the world, the drought stress that results from the shortage of rainfall, especially in those stages where the water requirement The drought stress is regarded as the most important and common stress in the environment, causing huge damage to crop products in the world ( 6 Drought is one of the most important environmental stresses that negatively affects the crops and hence has major adverse effects on agricultural production ( 4 Drought stress occurs when plant receives less water than its losses ( 3 Stress is the presence of an organism under the influence of the severity of an environmental factor that causes loss of appearance, efficiency or value ( 2 Existence of abiotic environmental stresses, especially drought stress, is one of the most important problems in arid and semi-arid regions of the world ( 1
