SiO2 nanoparticle attenuates phytotoxicity of graphene quantum dots in Zea mays (L.) plants

Abstract

The tremendous potential of graphene quantum dots (gqds) in biomedical applications has raised increasing concerns about their risks to ecosystem and human beings. silicon dioxide nanoparticles (sio₂ nps) serve as promising nanofertilizers in enhancing plant tolerance against abiotic stresses, but the knowledge of their role in regulating crop responses to gqd stress is far from sufficient in depth and width. The present work offers insight into the effects of sio₂ nps on the root uptake and phytotoxicity of gqds in maize (zea mays L.) seedlings. the addition of sio₂ nps significantly decreased the accumulation of gqds in the roots and leaves by 33.3% and 58.8%, respectively. physiologically, the presence of sio₂ nps led to substantial enhancement in photosynthesis and antioxidant enzyme activities relative to the plants under the gqds stress. responsive differentially expressed genes were mainly associated with crucial pathways regarding photosynthesis, the mapk signaling pathway in the maize plants, and glutathione metabolism. sio₂ nps alleviated the gqds-induced oxidative stress and helped to re-establish redox homeostasis by up-regulating the expression of genes related to antioxidant enzyme activities. these results showed that the root application of sio₂ nps alleviated the gqd-induced inhibition to the photosynthesis and growth of crop plants, which are of great significance for advancing the sustainable utilization of nanofertilizers in agriculture.