Abstract
Air pollution exerts detrimental effects on plant ecosystems and restricts agricultural productivity. Cement dust is considered to be one of the most harmful air pollutants of industrial origin and is a limiting factor for plant growth and productivity. This study aims to uncover the impacts of cement dust on photosynthetic pigments, protein content, hydrogen peroxide (H2O2) accumulation, lipid per oxidation and antioxidant enzyme activities of Arabidopsis thaliana. In this study, Arabidopsis plants were dusted with cement at a rate of 1.5 g per 1-m2 area and measurements were undertaken at 10 days after cement dust application. Treatment with cement dust resulted insignificant reductions in chlorophyll content and total soluble protein accumulation. Neither carotenoid nor starch content of Arabidopsis plants was affected by exposure to cement dust, whereas protease activity was significantly enhanced in cement dust-treated plants. Furthermore, exposure to cement dust significantly enhanced the production of H2O2, a product of oxidative stress, in the leaves of Arabidopsis plants. Moreover, Malondialdehyde (MDA) content, a product of lipid per oxidation, significantly increased after exposure to cement dust. In response to cement dust, activities of scavenging enzymes such as Ascorbate Peroxides (APX), Superoxide Dismutase (SOD) and Guaiacol Peroxidase (GPX) increased, whereas the activity of Catalase (CAT) activity decreased. The present results suggest that cement dust induced oxidative stress in Arabidopsis plants through the generation of Reactive Oxygen Species (ROS), induction of lipid peroxidation and up regulation of antioxidant enzyme activities.
Highlights
Plants are frequently exposed to different biotic and abiotic environmental stress factors, which occur separately or in combination and exert detrimental effects on plant ecosystems and restricting agricultural productivity (Mittler, 2002; Abu-Romman and Suwwan, 2012)
Chlorophyll a (Chla), Chlorophyll b (Chlb) and total chlorophyll contents were investigated in Arabidopsis plants exposed to cement dust (Table 1)
The present study indicated that cement dust has no significant impact on starch accumulation in Arabidopsis plants (Table 2)
Summary
Plants are frequently exposed to different biotic and abiotic environmental stress factors, which occur separately or in combination and exert detrimental effects on plant ecosystems and restricting agricultural productivity (Mittler, 2002; Abu-Romman and Suwwan, 2012). Abiotic stresses are commonly caused by water deficit, salinity, alkalinity, heat shock, freezing, ultraviolet irradiation, deficient or excess nutrients, anoxia and pollutants (Mittler, 2006; Wang et al, 2003). Air pollution is a major problem of modern urbanization and industrialization, resulting in undesirable effects on humans, animals and plants (Taylor et al, 1986; Wilson et al, 2004). Dust is a major particulate air pollutant, in dry climates (Naidoo and Chirkoot, 2004). Dust pollution is important near roads, quarries, cement works and other industrial areas. Cement dust is considered to be one of the most hazardous dust of industrial origin because it forms crusts and reacts with the atmospheric moisture; it is chemically active (Kabir and Madugu, 2010)
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