Abstract
Titanium dioxide nanoparticles (TiO(2)NPs) are widely used in agriculture in order to increase the yield and growth characteristics of plants. This study investigated the effects of TiO(2)NPs on photosynthetic pigments and several biochemical activities and antioxidant enzymes of the Vitex plant. Different concentrations of nanoparticles (0, 200, 400, 600 and 800 ppm) at five levels were sprayed on Vitex plants on the 30th day of the experiment. TiO(2)NPs at different concentrations had positive effects on root and shoot dry weight and a negative effect on leaf dry weight. The amount of chlorophyll increased with the concentration of TiO(2)NPs; however, the amount of chlorophyll b showed a decreasing trend while the total chlorophyll had a constant trend. The highest amount of soluble sugar was obtained in the treatment of 200 ppm nanoparticles. The application of TiO(2)NPs did not have any effect on the content of proline and soluble proteins of Vitex plant. The effects of foliar TiO(2)NPs, compared to the control, showed a significant increase in the activity of antioxidant enzymes. In general, TiO(2)NPs had a favorable effect on dry matter production and some antioxidant and biochemical properties of the Vitex plant.