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Schematic representation of the salt overly sensitive (SOS) pathway for salinity stress response. The SOS pathway regulates the Na+/H+ antiporters. The SS-induced increase in Ca2+ concentration in cytosol and is sensed by SOS3. SOS3 work together with SOS2 and triggers its kinase activity. The SOS2–SOS3 localized in plasma membrane. Then SOS2 phosphorylates SOS1 and triggers its antiporter (Na+/H+) activity assisting Na+ efflux from plant cell.
