Response of Antioxidant Enzyme Activities of the Green Microalga Chlorococcum sp. AZHB to Cu 2+ and Cd 2+ Stress

Changen Qiu, Weidong Wang, Yuheng Zhang, Guang-Jie Zhou () and Yonghong Bi ()
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Changen Qiu: Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, Hubei Normal University, Huangshi 435002, China
Weidong Wang: Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, Hubei Normal University, Huangshi 435002, China
Yuheng Zhang: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072, China
Guang-Jie Zhou: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072, China
Yonghong Bi: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072, China

Sustainability, 2022, vol. 14, issue 16, 1-9

Abstract: The green microalga Chlorococcum sp. AZHB, isolated from a wastewater treatment plant, can endure extremely environments contaminated by heavy metals, but little information is available about the physiological changes of microalgal cells after exposure to heavy metals. In this study, the response of antioxidant enzyme activities of this microalgal species were examined in batch cultures exposed to different concentrations of Cu 2+ or Cd 2+ for 10 days. The malondialdehyde (MDA) content and activities of peroxidase (POD) and superoxide dismutase (SOD) increased with the increasing concentration of Cu 2+ and Cd 2+ from 0 to 200 mg/L. The activity of catalase (CAT) increased with the increase in concentrations of Cu 2+ and Cd 2+ from 0–0.1 mg/L and 0–5 mg/L, respectively, and decreased from 0.1 mg/L Cu 2+ and 5 mg/L Cd 2+ , respectively. Our results suggest that the defense mechanisms of Chlorococcum sp. AZHB to heavy metals should be involved in the improvement of the antioxidant enzyme activity in microalgal cells.

Keywords: heavy metal; antioxidant enzyme activity; malondiadehyde; Chlorococcum sp. AZHB (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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