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- Title
Physiological effects of copper on the freshwater alga Closterium ehrenbergii Meneghini (Conjugatophyceae) and its potential use in toxicity assessments.
- Authors
Hui Wang; Sathasivam, Ramaraj; Jang-Seu Ki
- Abstract
Although green algae of the genus Closterium are considered ideal models for testing toxicity in aquatic ecosystems, little data about the effects of toxicity on these algal species is currently available. Here, Closterium ehrenbergii was used to assess the acute toxicity of copper (Cu). The median effective concentration (EC50) of copper sulfate based on a dose response curve was 0.202 mg L-1, and reductions in photosynthetic efficiency (Fv / Fm ratio) of cells were observed in cultures exposed to Cu for 6 h, with efficiency significantly reduced after 48 h (p < 0.01). In addition, production of reactive oxygen species significantly increased over time (p < 0.01), leading to damage to intracellular organelles. Our results indicate that Cu induces oxidative stress in cellular metabolic processes and causes severe physiological damage within C. ehrenbergii cells, and even cell death; moreover, they clearly suggest that C. ehrenbergii represents a potentially powerful test model for use in aquatic toxicity assessments.
- Subjects
PHYSIOLOGICAL effects of copper; TOXIC algae; FRESHWATER algae; ZYGNEMATALES; TOXICITY testing; AQUATIC ecology
- Publication
Algae, 2017, Vol 32, Issue 2, p131
- ISSN
1226-2617
- Publication type
Article
- DOI
10.4490/algae.2017.32.5.24