Effect of zinc nanoparticles on antioxidative system of potato plants

Aim: Nanotechnology has the potential to change the entire agriculture sector but there might be several risks which may affect the environment. Raw materials such as heavy metals used to synthesize metal nanoparticles have significant negative effect on various growth, physiological and biochemical characteristics of plants. The present study was carded out to assess the effect of zinc nanoparticles on some metabolic activities of potato plants. Methodology: Potato plants were grown in growth chambers. Two foliar sprays of zinc nanoparticles of 100, 300 and 500 ppm were given on potato plants. First spray was given after 25 days and the second after 45 days of planting. Enzymatic antioxidants (catalase and peroxidase), non enzymatic antioxidants (total phenolics and anthocyanins) and carbohydrates (starch and total soluble sugars) were analysed. Results: The activity of enzymes was high in zinc nanoparticle treated plants compared to control plants. There were 142, 109 and 212% increase in catalase activity in plants treated with 100, 300 and 500 ppm concentration of nanoparticles, respectively. Increase in peroxidase activity was significant at 500 ppm concentration. Treatment with zinc nanoparticles increased the total phenolics and anthocyanin content significantly at 300 and 500 ppm concentrations. There were 15, 29 and 259% increase in the starch content due to 100, 300 and 500 ppm concentration of nanoparticles, respectively. Interpretation: The increase in enzymatic and non-enzymatic antioxidants clearly indicated that the zinc nanoparticles lead to oxidative stress and caused toxicity to potato plants. [GRAPHICS]