INFLUENCE OF ZINC OXIDE NANOPARTICLES ON BIOACTIVE COMPOUNDS IN MELON FRUITS (Cucumis melo L.)

Abstract

Foliar application of metal nanoparticles represents a promising strategy for enhancing both yield and nutritional quality in horticultural crops. This study focused on the foliar application of zinc oxide nanoparticles (ZnO NPs) across a range of concentrations (0, 150, 200, 250, 300, and 350 mg L-1) and assessed their impact on the yield and nutraceutical profile of melon fruits. Our findings revealed specific effects at different concentration levels: lower concentrations (150 mg L?¹) improved yield and biophysical quality; intermediate concentrations (250 mg L?¹) enhanced enzymatic and non-enzymatic antioxidants; while higher concentrations (300–350 mg L?¹) resulted in reduced yield and enzymatic activity, accompanied by elevated Zn concentration in melon pulp. The utilization of ZnO NPs presents a viable avenue for enhancing both the biophysical quality and antioxidant content of melon fruits. However, it is crucial to note that their effects are dose-dependent, capable of inducing either beneficial or inhibitory outcomes. Consequently, further comprehensive investigations are warranted to elucidate optimal application dosages and maximize the potential benefits of ZnO NPs in horticultural production.