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| Efects of BDE-47 on the chlorophyll fluorescence parameters of two species of marine microalgae |
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Abstract Effects of 2, 2′, 4, 4′-tetrabrominated biphenyl ether (BDE-47) on photosynthetic characteristics of two marine microalgae were comprehensively investigated. The results showed that no significant inhibition of maximal photochemical efficiency of PSII(Fv/Fm), photochemical quenching (qP) of Chlorella sp. and Heterosigam akshiwo were determined at the concentration of 0.1~2.5μg/L, which meant that BDE-47 didn′t cause damage to PSII reaction center of the two algae. At the dose of 2.5 μg/L PSII potential fluorescence efficiency (Fv/Fo), actual photochemical efficiency of PSII(φPSII) and electron transport rate (ETR) of Chlorella sp.. were inhibited distinctly after exposed to BDE-47 for 96h. And φPSII, Fv/Fo and ETR of Heterosigam akashiwo, weren′t observed inhibition at the BDE-47 concentration of 2.5 μg/L, which revealed that this microalgae was more tolerant than Chlorella sp.. Among all of chlorophyll fluorescence parameters, Fv/Fo, φPSII and ETR are more suitable to be used as biomarkers for evaluation of pollution level of BDE-47 in marine environment.
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Received: 01 June 2009
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