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Silicon (Si) can have several beneficial effects when exogenously applied to plants, including increased tolerance against several abiotic and biotic stressors. The current study investigated the role of nanosized, monodisperse silicon particles in alleviating the harmful impact of excess sodium chloride (NaCl) on ‘Valencia’ sweet orange. One-year-old ‘Valencia’ (Citrus x sinensis L. Osbeck) plants budded onto Kuharske (Citrus sinensis L. Osbeck x Poncirus trifoliata L. Raf.) rootstock were irrigated with 0, 60 or 120 mM sodium chloride (NaCl) solution for six months. We observed an incremental reduction in plant growth with increased NaCl application. Severe foliar drop and damage were observed following 60 and 120 mM NaCl application. Silicon nanoparticles applied by direct foliar application at four concentrations (0, 200, 400 and 600 mM) to these stressed plants reduced the damage in the greenhouse …