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Biostimulants can be used as an alternative to fertilizers to overcome the effect of nutrient deficiency in plants. Yeast is a biostimulant, having the capacity to modify physiological processes in plants by improving germination and seedling growth under environmental stress. The effects of yeast extract, a sustainable biostimulant derived from yeast (Saccharomyces cerevisiae) containing all the nutritive values, amino acids, vitamins, and growth factors, were investigated in rice (Oryza sativa). Various growth parameters, Chlorophyll a fluorescence, PS II, metabolites accumulation, and antioxidative function of enzymatic (SOD, CAT, APX, GPOX) as well as non-enzymatic (phenol, AsA, and GSH) antioxidant were analyzed in two rice varieties (Hraswa-tolerant and Manu ratna-sensitive) in both yeast extract primed and non-primed seeds subjected to nutrient-deficient soil conditions. The application of the …