State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
Nanjing Water Planning and Designing Institute Corp., Ltd., Nanjing 210022, China.
Bioresour Technol. 2020 May;303:122963. doi: 10.1016/j.biortech.2020.122963. Epub 2020 Feb 6.
Algae has potential to remediate heavy metals. However, the physiological responses of live algae to heavy metals are not well studied. In this study, the physiological responses of Microcystis aeruginosa to zinc (Zn) and cadmium (Cd) ions and its ability to accumulate ions were investigated. Low concentrations (<0.1 mg/l) of Zn and Cd had little influence on algal growth and physiological processes, whereas concentrations above 0.1 mg/l increased the esterase activity (from 42.5% to 621.9%), superoxide dismutase activity (from 12.8% to 45.4%), and malondialdehyde content (from 18.2% to 103.9%), and dramatically inhibited the cell division (from 12.6% to 70.0%) and photosynthetic performance (from 7.1% to 53.1%) of M. aeruginosa. The accumulation of Zn or Cd ions by M. aeruginosa increased exponentially with the initial concentration of metallic ions. Collectively, these findings reveal that M. aeruginosa has considerable potential in the remediation of freshwater lakes with heavy metal contamination during cyanobacterial blooms, where metallic ions are lower than 0.1 mg/l.
藻类具有修复重金属的潜力。然而，活藻类对重金属的生理响应尚未得到充分研究。在这项研究中，研究了铜绿微囊藻对锌（Zn）和镉（Cd）离子的生理响应及其积累离子的能力。低浓度（<0.1 mg/l）的 Zn 和 Cd 对藻类生长和生理过程几乎没有影响，而浓度高于 0.1 mg/l 时，会增加酯酶活性（从 42.5%增加到 621.9%）、超氧化物歧化酶活性（从 12.8%增加到 45.4%）和丙二醛含量（从 18.2%增加到 103.9%），并严重抑制铜绿微囊藻的细胞分裂（从 12.6%减少到 70.0%）和光合作用性能（从 7.1%减少到 53.1%）。铜绿微囊藻对 Zn 或 Cd 离子的积累与金属离子的初始浓度呈指数增长。总的来说，这些发现表明，在蓝藻水华期间重金属污染的淡水湖中，当金属离子浓度低于 0.1 mg/l 时，铜绿微囊藻具有相当大的修复潜力。
