Effect of Salicylic Acid on the Growth and Development of Sweet Pepper (Capsicum annum L.) under Standard and High EC Nutrient Solution in Aeroponic Cultivation

High electrical conductivity (EC) in cultivation systems with the recirculating nutrient solutions can affect plant growth and development. This study aimed to investigate effect of salicylic acid (SA) on selected physiological biochemical parameters sweet pepper (Capsicum annum L.) growing aeroponically at standard high concentrations nutritive solutions. Four experimental variants were tested: (1) plants cultivated under low EC conditions, (2) conditions treated foliar SA, (3) (4) SA leaves roots. The obtained results revealed that exogenous regardless EC, reduced formation fruits calcium deficiency symptoms. Furthermore, helps cope stress through an increase leaf SPAD index, maximum light-adapted chlorophyll fluorescence PSII viability. Exogenous number soluble proteins both EC; however, increased H2O2 content induced a defence mechanism reflected by upregulation antioxidant enzyme activity. provide valuable information role alleviation harmful salinity aeroponic cultivation.