The Oxidative Stress Response of Mirabilis jalapa to Exhausted Engine Oil (EEO) during Phytoremediation
Sadia Tabassum1, Naeem Shahid2, Jin Wang3, Muhammad Shafiq1, Mehvish Mumtaz1, Muhammad Arslan4
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1College of Earth and Environmental Sciences, University of the Punjab, Lahore
2Department of Environmental Sciences, COMSATS Institute of Information Technology, Vehari, Pakistan
3College of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
4Petroleum Engineering and Geosciences Department, King Fahd University of Petroleum and Minerals,
Dammam, Saudi Arabia
Submission date: 2016-01-09
Final revision date: 2016-02-25
Acceptance date: 2016-02-25
Publication date: 2016-11-24
Pol. J. Environ. Stud. 2016;25(6):2581-2587
The current study elucidates the responses of a typical ornamental plant Mirabilis jalapa to exhausted engine oil (EEO) during phytoremediation. Greenhouse experiments were established to assess the plant’s response in terms of germination, biomass, chlorophyll content, superoxide dismutase (SOD) activity, catalase activity, soluble protein content, and hydrocarbon degradation at different concentrations of EEO (0.5 to 15 mL). Results illustrate that the increasing concentration of EEO reduced plant growth, whose responses were further confirmed by decreased chlorophyll content (chlorophyll a and b), high superoxide dismutase activity, lowered catalase activity, and reduced soluble protein content. Although the germination rate was successful in all the treatments, we observed a significant reduction in biomass – especially the elongation inhibition rate (>48.4%) – at EEO concentrations higher than 2%. Conclusively, the high toxicity index (40.4% to 93.3%) and lesser hydrocarbons degradation (36% to 10.8%) render the plant species unsuitable for future EEO phytoremediation experiments.
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