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Abstract

MOLECULAR RAPID ASSAY ON PLANT CELLS: A TEST FOR DNA DAMAGE CAUSED BY POLLUTION FROM AL-DAURA THERMAL POWER STATION ON CITRUS AURANTIUM L. PLANTS

Zaid Abdullah Azeez*, Ali Abdul-Amir Al-Salihy and Wiaam Ahmed Al-Amili

ABSTRACT

Genotoxicity testing is generally used for hazard recognition with relevance to DNA damage that can be caused by many chemicals or pollutants. In this study, alkaline version of comet assay was used to investigate the DNA damage in the Iraqi sour orange (Citrus aurantium L.) leave and root cells responding to the pollutants from Al-Daura Thermal Power Station in Baghdad-Iraq such as Sulfur Dioxide (SO2), Oxides of Nitrogen (NOx), Hydrogen Sulfide (H2S), Carbon Monoxide (CO), Ozone (O3), Heavy metals like Nickel (Ni), Cadmium (Cd) and Copper (Cu) and other pollutants. Three selected sites with gradual distances from the station were chosen for sampling according to downwind for site. In addition, one of unpolluted site upwind from the station was chosen for comparison as control site. The samples were collected for two seasons; season one was in December 2014 and season two was in March 2015. The comet parameters (tail length, % DNA in the tail and tail moment) of Citrus aurantium L. cells in all sites are significantly higher when compared with those of control site. The plants in site 2 were the most plants affected by pollutants according to Comet assay parameters. Comparison between the results of Comet parameter of Citrus aurantium cells for the two seasons show that there was slight significant increase in tail moment (mean ± SE) in season 2 other than that of season 1. Concluded that the high DNA damage in Citrus aurantium L. leave and root cells detected in this study is of great concern and highlighted the increase effect of pollutants resulted from Al-Daura thermal power station in Baghdad / Iraq.

Keywords: Genotoxicity, Comet assay, Thermal power station, Pollution, Heavy metals, Citrus aurantium L.


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