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The antioxidant potential is referredto as compounds that are capable to protect the biological system against the deleterious effect of reactions involving reactive oxygen species (ROS). ROS are toxic by-products of oxygen metabolism. ROS have a significant role in plant signaling, growth, development, and majorly in response to environmental fluctuations. ROS family plays a double role under various environmental stress conditions. While in various key physiological phenomena, they act as secondary messengers and induces oxidative damage. ROS led to cellular damages that manifest themselves in biomolecules degradation, which eventually amalgamate to cellular death in plants. To assure survival, plants have developed efficient antioxidant machinery having two branches that is an enzymatic and non-enzymatic antioxidant. This chapter will emphasize the various type of ROS, their sites of cellular production, targets, and scavenging mechanism mediated by antioxidants in abiotic stress. Such profound knowledge will let us build strategies against environmental stress.

Mechanistic Role of Reactive Oxygen Species and Its Regulation via the Antioxidant System under Environmental Stress