Selenium Mitigates Cd-Induced Oxidative Stress and Photosynthesis Inhibition in Two Cherry Tomato Cultivars

Abstract The purpose of this study is to explore the physiological mechanisms underlying attenuation Cd toxicity using Se in two cherry tomato cultivars ‘Hanluzhe’ (HLZ) and ‘Lvfeicui’ (LFC), with low high accumulation rates, respectively. Hydroponic experiments were conducted 2.5 μmol L −1 was applied hydroponic solution 50 Cd. photosynthetic parameter, antioxidant enzyme activities, non-enzymatic antioxidants, mineral elements, phytochelatins, contents tomatoes detected. Exogenous reduced assimilation altered its chemical form subcellular distribution both cultivars. mitigated Cd-induced oxidative stress by enhancing activity superoxide dismutase (37.0% HLZ 48.9% LFC), peroxidase (50.6% 30.4% catalase (18.5% 28.6% ascorbate (26.6% 47.4% glutathione (28.3% LFC). Although significantly increased rate (Pn) HLZ, it exhibited no significant effect on Pn LFC under stress. improved phytochelatin (15.1% 42.4% LFC) content, which accelerated chelation Further, alleviated nutrient (Ca, Mg, Fe, Zn, Cu) or transportation varying degrees. efficiency alleviation higher Cd-accumulating cultivar than HLZ. Screening exogenous a promising method manage tomatoes.