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Salinity stress is the major abiotic stress that affects crop production and productivity as it has a multifarious negative effect on the growth and development of the plant. Salinity stress stimulates the accumulation of reactive oxygen species (ROS) which is toxic to cells at higher concentrations. At lower concentrations, these molecules help in the mitigation of salinity stress through a series of signal transduction mechanisms. The respiratory burst by NADPH oxidase leads to an increase in ROS generation. It is a key signalling node in the plant gene network and helps to integrate the signal transduction with ROS signalling. Reactive nitrogen species (RNS) are free radical and non-radical reactive molecules that are also produced under salinity stress and lead to nitrosative stress by regulating SOS, MAPK dependent, Ca²⁺ dependent and G-protein dependent pathways. The reactive sulphur species (RSS) is a strong …