Investigating the effect of air pollutants in Tehran on leaf surface, proline concentration, soluble carbohydrates and photosynthetic pigments (chlorophyll a, chlorophyll b, total chlorophyll and carotenoids) in two Nerium oleander and acacia (Robinia pseudo acacia L.) plants.

Abstract

The effects of air pollutants in Tehran city on leaf area, proline concentration, soluble carbohydrates and photosynthetic pigments (chlorophyll a, chlorophyll b, total chlorophyll and carotenoids) in acacia and persimmon were the subject of this research. At first, using the information of Environmental Protection Organization and Air Quality Control Department, Sorkheh Hesarbeh Park was selected as a clean environment and Azadi area as a polluted environment, and the desired plants were taken from these two areas. Leaf area in November (84) and June (85) and concentration of proline, soluble carbohydrates and amount of photosynthetic pigments (chlorophyll a, chlorophyll b, total chlorophyll and carotenoids) in July (85) were determined and compared by spectrophotometric method. The results of this research showed that air pollution caused a significant decrease in the leaf area in acacia and persimmon. Also, air pollution increased the concentration of proline in two plants, Acacia and Persimmon. Due to air pollution, the concentration of soluble carbohydrates decreased in acacia and increased in persimmon, and these changes were statistically significant. The results of this research showed that as a result of air pollution, the amount of photosynthetic pigments including (chlorophyll a and b and total chlorophyll and carotenoids) increased significantly in date palm, and in acacia chlorophyll a and total chlorophyll and carotenoids decreased, this decrease is significant in the case of carotenoids. and the amount of chlorophyll b did not change much.

Keywords

• tehran air pollutants
• acacia
• proline
• oleander
• photosynthetic pigments
• soluble carbohydrates