The present paper reports data on the biological activity of nanocompositions based on a C60-L-threonine (C60-Thr) derivative. These nanocompositions promote the nonspecific resistance of plants to the action of stress factors (ultraviolet radiation, pesticides, and phytopathogens). Additionally, we determined the perspectives of the C60-Thr adduct application in the cultivation of plants due to the decrease of the pesticide load on the environment. The biological study of C60-Thr revealed the plant growth-stimulating ability due to its influence on the photosynthetic apparatus activity and antioxidant properties.