The Effects of Copper Oxide Nanoparticles on the Photosynthesis Characteristics and Antioxidant Enzymes of Radish (Raphanus Sativus L.) Plants

The increase in metal nanoparticles (NPs) in the vegetable cultivation environment may cause their contamination through foliar absorption. This study investigated the effect of different concentrations of copper (Cu)-NPs (۰, ۵۰, ۱۰۰, ۲۰۰, ۳۰۰, and ۴۰۰ mgL-۱) on the early growth stages of radish plants and evaluated their physiological and chemical characteristics. The study also examined the toxic effects of Cu oxide (CuO)-NPs, as a source of air stress, on plant growth, photosynthesis pigments, and antioxidant systems in radish plants. The reduction in chlorophyll a, b and carotenoid content were not significant at the ۵۰ and ۱۰۰ mgL-۱ concentrations of CuO. However, plants treated with ۳۰۰ mgL-۱ and ۴۰۰ mgL-۱ demonstrated a significant decrease in chlorophyll pigments. Based on the results, the Cu content of radish leaves increased with increasing Cu concentration, so that the highest Cu content of leaves was observed at a concentration of ۴۰۰ mgL-۱. Thus, CuO nanostructures had a negative effect on photosynthesis pigments and antioxidant enzymes. The results revealed that the uncontrolled release of nanostructured materials into the atmosphere in an agricultural environment may reduce physiological processes.

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Keywords: CuO nanoparticles ، H۲O۲ ، photosynthetic pigments ، radish ، toxicity