Figure 4.

Adverse effects of drought stress on plant growth led to membrane damage, overproduction of ROS, and the deleterious effect on enzyme activity and other physiological processes such as photosynthesis rate. The induction of defense strategies in plants by NO through activation of antioxidant enzymes reduces the toxicity of free radicals and ROS negative impact and improves photosynthesis and membrane stability, which finally helps plants to avoid, tolerate, or escape drought conditions.