Biochemical Influence of (Chlorella vulgaris) Exposure to Heavy Elements Stress

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Jaafar B. Algburi, Ahed Mohammed Ali Abdul Ridha, Hasan A.Qazmooz, Ghaith ayad, Fatema Mushtaq

Abstract

The current study deals with the biological responses to fresh water green alga  Chlorella vulgaris, due to its exposure to some environmental stress, which included different concentration of Zinc (Zn) and Cadmium (Cd) elements, on the biochemical parameters. Chlorella vulgaris was treated with two different concentration of Zinc and cadmium (1 and 2) ppm. and the experiment lasted for 21 days during which many physiological and biochemical parameters were measured in the algae under test. The parameters included growth curve, photosynthesis pigments (chlorophyll-a) and total protein, then studying the effect of previous factors on some enzymatic parameters such as Catalase and SOD, and the result were recorded in (1 day, 8 days, 21 days). The growth rate values results have increased significantly with 2 ppm of Cd and Zn compared to control (p<0.05),  Ch-a concentrations were increased significantly with 2 and 1 ppm in 1th and 8th days with Zn, in Cd show decrease in Ch-a concentrations, protein with 1ppm  of Cd and Zn treatments show increase in proteins concentration. While, with 2 ppm of Cd and Zn was noted the decrease in protein values. The antioxidants results showed that SOD and CAT concentrations increased in experiment of the Cd and Zn with the both concentration on the 1th and 8th days, while in 21th day the concentration decrease.

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