AIR POLLUTION EFFECTS ON THE ACTIVITY OF ANTIOXIDANT ENZYMES IN NERIUM OLEANDER AND ROBINIA PSEUDO ACACIA PLANTS IN TEHRAN

The air pollution effects on the activity of antioxidant enzymes were investigated on nerium oleander androbinia pseudo acacia in tehran. considering the information obtained from the department of theenvironment of iran, sorkh hesar park as well as south azadi were selected as two sampling sitesrepresenting the unpolluted and polluted area respectively. a number of plant leave samples werecollected from both sampling sites simultaneously. the activity of plant enzymes including peroxidase,catalase and ascorbate peroxidase was investigated using spectrophotometric methods. a higher level ofperoxidase and catalase enzymes were measured in both plant samples collected from polluted area.however, this higher level was only statistically significant for the activity of peroxidase enzyme inrobinia pseudo acacia plants compare of to the control group (p < 0.05). the lower level of ascorbateperoxidase was observed in nerium oleander plant leaves collected from the contaminated sampling site(p < 0.05), but though, the activity of this enzyme in robinia pseudo acacia did not change significantly.the overall plant injury symptoms found in this study demonstrated that both nerium oleander androbinia pseudo acacia have a potential to be considered as effective bioindicators to reflect theenvironmental air quality in polluted areas.