The Effect of Foliar Selenium (Se) Treatment on Growth, Photosynthesis, and Oxidative-Nitrosative Signalling of Stevia rebaudiana Leaves

Selenium (Se) enrichment of Stevia rebaudiana Bertoni can serve a dual purpose, on the one hand to increase plant biomass and stress tolerance other produce Se fortified plant-based food. Foliar spraying (0, 6, 8, 10 mg/L selenate, 14 days) plantlets resulted in slightly decreased stevioside rebaudioside A concentrations, it also caused significant increment stem elongation, leaf number, content, suggesting that foliar supplementation be used as biofortifying approach. Furthermore, limited photosynthetic CO2 assimilation (AN, gsw, Ci/Ca), but exerted no effect chlorophyll, carotenoid contents parameters associated with photosystem II (PSII) activity (FV/FM, F0, Y(NO)), indicating causes photodamage PSII. Further results indicate is able activate PSI-cyclic electron flow independent protection mechanisms apparatus plants. The applied activated superoxide dismutase (SOD) isoenzymes (MnSOD1, FeSOD1, FeSOD2, Cu/ZnSOD1, Cu/ZnSOD2) down-regulated NADPH oxidase Se-induced limitation anion levels consequent oxidative signalling leaves. Additionally, decrease S-nitrosoglutathione reductase protein abundance intensification tyrosine nitration Se-triggered nitrosative signalling. Collectively, these suggest alters shoot morphology without significantly affecting yield photosynthesis, increasing content performing antioxidant effects, which indicates application may promising method cultivation.