Abstract：Marine green alga Chlorella vulgaris was cultured in different concentrations (0, 1.52, 3.04, 6.08, 12.16, and 24.32 μg/g)of pentabromodiphenyl ether BDE-85 at different pH (8.66, 8.44, 8.19, and 7.93). The specific growth rate, net photosynthetic oxygen evolution rate, dark respiration rate, chlorophyll fluorescence parameters, and superoxide dismutase and catalase activities of green alga were measured during exponential growth period, to explore the toxic stress of pentabromodiphenyl ether BDE-85 on the physiological response of green alga under different pH conditions. The results showed that under low pH condition, the specific growth rate of green alga treated with low and medium mass concentration of BDE-85 was increased. The experimental groups of 6.08 μg/g and 12.16 μg/g increased by 6.33% and 7.39% compared with the control group, respectively. The net photosynthetic oxygen release rate of 6.08 μg/g experimental group was 18.43% higher than the control group at low pH, while that of 24.32 μg/g experimental group was 39.98% lower than the control group. At the same time, the activities of catalase and superoxide dismutase were increased, indicating that the antioxidant effect of green alga was enhanced, and the stress activity appeared, but the enhanced effect was not obvious under high concentration (24.32 μg/g test group) BDE-85 treatment. Under low pH condition, the growth of green alga can be promoted, and the toxic effect of low and medium concentration of BDE-85 led to be alleviated. However, when the concentration of BDE-85 was too high, the toxic effect led to inhibit the growth of green alga, and the interaction between the two was not obvious under high concentration of BDE-85.
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2023, Vol. 42 
