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2015•Haiyang yu huzhaoRequires access

EFFECT OF CADMIUM ON PHOTOSYNTHESIS OF SCENEDESMUS OBLIQUUS

Duan Chen

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Abstract

We investigated the absorption rate, photosynthetic activity, and recovery process of Scenedesmus obliquus under different concentrations of cadmium(Cd2+). The cadmium absorption rate of S. obliquus could reach as high as 97%. The half maximal inhibitory concentration(IC50) of Cd2+ reached 119.04μmol/L in 96 h. The concentration of chlorophyll a and photosynthetic activity of S. obliquus were both significantly decreased, especially in PSⅡ(photosystem Ⅱ), when final concentration of Cd2+ was higher than 50μmol/L. Photosynthetic activity did not restore by adding fresh medium, but led to the depressions in effective PSⅡ quantum yield Y(Ⅱ) and the maximum PSⅡ quantum yield(Fv/Fm) to zero. The impact of Cd2+ on S. obliquus was not significant under low concentration of 1—10μmol/L in which S. obliquus could maintain a high photosynthetic ability. Therefore, S. obliquus is an ideal adsorption material potential for treating cadmium polluted water.

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What this paper is about

We investigated the absorption rate, photosynthetic activity, and recovery process of Scenedesmus obliquus under different concentrations of cadmium(Cd2+). The cadmium absorption rate of S. obliquus could reach as high as 97%. The half maximal inhibitory concentration(IC50) of Cd2+ reached 119.04μmol/L in 96 h. The concentration of chlorophyll a and photosynthetic activity of S. obliquus were both significantly decreased, especially in PSⅡ(photosystem Ⅱ), when final concentration of Cd2+ was higher than 50μmol/L. Photosynthetic activity did not restore by adding fresh medium, but led to the depressions in effective PSⅡ quantum yield Y(Ⅱ) and the maximum PSⅡ quantum yield(Fv/Fm) to zero. The impact of Cd2+ on S. obliquus was not significant under low concentration of 1—10μmol/L in which S. obliquus could maintain a high photosynthetic ability. Therefore, S. obliquus is an ideal adsorption material potential for treating cadmium polluted water.

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Available abstract

We investigated the absorption rate, photosynthetic activity, and recovery process of Scenedesmus obliquus under different concentrations of cadmium(Cd2+). The cadmium absorption rate of S. obliquus could reach as high as 97%. The half maximal inhibitory concentration(IC50) of Cd2+ reached 119.04μmol/L in 96 h. The concentration of chlorophyll a and photosynthetic activity of S. obliquus were both significantly decreased, especially in PSⅡ(photosystem Ⅱ), when final concentration of Cd2+ was higher than 50μmol/L. Photosynthetic activity did not restore by adding fresh medium, but led to the depressions in effective PSⅡ quantum yield Y(Ⅱ) and the maximum PSⅡ quantum yield(Fv/Fm) to zero. The impact of Cd2+ on S. obliquus was not significant under low concentration of 1—10μmol/L in which S. obliquus could maintain a high photosynthetic ability. Therefore, S. obliquus is an ideal adsorption material potential for treating cadmium polluted water.

Key concepts: Scenedesmus obliquus, Photosynthesis, Cadmium, Chemistry, Photosystem II, Quantum yield, Chlorophyll, Absorption (acoustics)

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