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Published on: October 25, 2024
Pentachlorophenol induced physiological-biochemical changes in Chlorella pyrenoidosa culture
1College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China. honghc@zjnu.cn
Chemosphere
|October 15, 2010
Summary
Pentachlorophenol (PCP) exposure decreased green alga biomass and photosynthetic pigments. Carotenoids were the most sensitive indicator of PCP toxicity, suggesting its impact on algal health.
Area of Science:
- Environmental toxicology
- Algal biotechnology
- Biochemistry
Background:
- Pentachlorophenol (PCP) is a persistent organic pollutant with known toxicity.
- Green algae, such as Chlorella pyrenoidosa, are important primary producers and sensitive bioindicators.
- Understanding PCP's impact on algae is crucial for assessing aquatic ecosystem health.
Purpose of the Study:
- To investigate the physiological and biochemical effects of varied pentachlorophenol (PCP) concentrations on Chlorella pyrenoidosa.
- To identify sensitive biomarkers for PCP toxicity in algal cultures.
Main Methods:
- Culturing Chlorella pyrenoidosa under different PCP concentrations (0, 0.4, 2.5, 10 mgL(-1)).
- Measuring algal biomass, photosynthetic pigment levels (chlorophyll a, b, carotenoid), soluble protein content, and nitrate reductase (NR) activity.
Main Results:
- Increased PCP concentrations led to reduced algal biomass, photosynthetic pigments, and soluble protein.
- Nitrate reductase (NR) activity increased with higher PCP levels, suggesting an uncoupling effect on cellular energy (ATP).
- Carotenoids demonstrated higher sensitivity as indicators of PCP toxicity compared to other measured parameters.
Conclusions:
- PCP negatively impacts Chlorella pyrenoidosa growth and physiology.
- Photosynthetic pigments, particularly carotenoids, are effective biomarkers for detecting PCP contamination.
- The observed NR activity changes suggest PCP disrupts cellular energy metabolism in algae.
