Abstract
			
			The freshwater green algae Closterium is sensitive to water
quality, and hence has been suggested as ideal organisms for
toxicity testing. In the present study, we evaluated the photosynthetic
and biochemical responses of C. ehrenbergii to
the common contaminants, coppers. The 72 h median effective
concentrations (EC50) of CuSO4 and CuCl2 on the test
organism were calculated to be 0.202 mg/L and 0.245 mg/L,
respectively. Exposure to both coppers considerably decreased
pigment levels and photosynthetic efficiency, while inducing
the generation of reactive oxygen species (ROS) in cells
with increased exposure time. Moreover, the coppers significantly
increased the levels of lipid peroxidation and superoxide
dismutase (SOD) activity, even at relatively lower concentrations.
These suggest that copper contaminants may
exert deleterious effects on the photosynthesis and cellular
oxidative stress of C. ehrenbergii, representing its powerful
potential in aquatic toxicity assessments.			
						
						
					 
		
		
		 
		
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