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The defending role of silicon in relation to growth, leaf area, plant total biomass, photosynthetic pigments, lipid peroxidation, membrane characteristics and stability index (%), membrane leakage, macro and microelement availability, as well as enzymatic and non-enzymatic antioxidants contents, were assessed under acidic and alkaline stresses in wheat plants grown hydroponically. For this purpose, we used 9 treatments with three levels of Si (0, 1, and 3 mmol L^-1) in the form of Na₂SiO₃ against three levels of pH (5, 7 and 9). Results showed that acidic, as well as alkaline stresses significantly reduced plant physiological traits and photosynthetic rates by creating deficiencies accompanied by toxicities of various macro and microelements. Moreover, acidic and alkaline stresses reduced membrane stability through lipid peroxidation measured as malondialdehyde contents, enhanced membrane injury and …