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[9000122.] رقم البحث : 9000122 - |
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Growth, photosynthesis and some related metabolites as suitable selection criteria for the copper tolerance of Ankistrodesmusfalcatus / / |
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قطاع الدراسات البيئية / Environmental Education |
| تخصص البحث : Environmental Education |
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Journal of Environmental Studies / / 8 - august 2012 |
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Zeinab A. Ahmed ( jes@sohag-univ.edu.eg - ) |
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Magdy A. Abo-Gharbia ( jes@sohag-univ.edu.eg - ) |
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Asmaa B. Ahmed ( jes@sohag-univ.edu.eg - ) |
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Cu toxicity - oxidative stress - Ankistrodesmusfalcatus- sewage water- photosynthesis- copper tolerance. |
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This investigation was conducted to study the effects of copper on growth and metabolism of Ankistrodesmusfalcatus isolated from sewage water at El-Dare Treatment Plant. The alga was grown in BG-11 medium containing different cu concentrations (0.0, 0.5,5,10,50,100,150, 200and250µm Cu+2). The test organism was left to grow for 12 days under the various culevels.The effect of copper on the growth, photosynthetic pigments, protein metabolism (soluble, insoluble), antioxidant compounds (phenolic,Proline) were determined.The cell number and dryweight wereincreased highly significantly up to 10 µmcu+2),then the cell number and dryweight reduced gradually by increasingthe doses of the copper .The concentration of photosynthetically active pigment peaked up to 10 µm cu+2), Then they remained more or less unchanged up to 50 µm cu+2) , after this it was reduced .The content of soluble carbohydrates decreased dramatically up to 10 µm cu+2, and then it was increased smoothly as the cu concentration increased in culture media.CuStress induced a significant changes in the soluble protein up to the level of 10 µmCu+2, then ahigh significant accumulation was obtained which peaked at the highest concentration of Cu+2 (250 µm). The insoluble and total proteins remained more or less unchanged at the all Cuconcentration used. Aminoacids content accumulated progressively and irregularly by cu treatment. While proline content decreased by about 65.6% at the level of 10µm cu+2 concentration. It is on other hand increased by 261.7% at the level of 250 µm cu+2in relation to control value.Phenolic compounds seemed to be not affected by copper treatment. |
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