▎ 摘　　要

Stevia is a source of natural sweetener. Numerous researches showed that silver nanoparticles affected the yield and growth of agricultural crops. The effect of silver, graphene, and nanocomposite nanoparticles on a few biochemical and morphological parameters of the Stevia plant were studied. Synthesized Ag nanoparticles were confirmed by the absorption maxima and SEM micrograph. The use of nanocomposites at 40 mM, resulted in the higher chlorophyll content (25%) and increased accumulation of soluble sugars (27%), flavonoids (51%), total phenol (33%) and total protein (51%) as compared to the control plants. The plants treated with nanocomposite at a concentration of 60 mM, had more stevioside and rebaudioside content than plants treated with nanocomposite at a concentration of 40 mM.