Abstract
Plants produce different signaling molecules that regulate the most important physiological and biochemical processes that are associated with tolerance and adaptation to abiotic stresses. These molecules at high concentrations can be phytotoxic and induce cell damage or death. At these molecules belong the reactive nitrogen species (RNS), reactive oxygen species (ROS), and the reactive sulfur species (RSS). These species include free radicals and nonradical molecules and all of theme contributes to the oxidative stage of plants. The nitric oxide (NO) is tightly connected with theme and has a regulatory function in a dynamic equilibrium to avoid excess. The low accumulation of these radicals has been associated to specific role during plant growth and development and a pivotal role during plant adaptation to adverse environmental conditions. The regulation action of NO on the antioxidant systems can lead to equilibrium of RNS, ROS, and RSS by avoiding oxidative damage and death of plant cell.
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