Effects of lead on growth, photosynthetic characteristics and production of reactive oxygen species of two freshwater green algae
| Autor: | Ly H.T. Dao, John Beardall |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
0301 basic medicine
Pollution Chlorophyll Environmental Engineering Health Toxicology and Mutagenesis media_common.quotation_subject Fresh Water Chlorella 010501 environmental sciences Photosynthesis 01 natural sciences 03 medical and health sciences chemistry.chemical_compound Algae Botany Environmental Chemistry Scenedesmus 0105 earth and related environmental sciences media_common Pollutant chemistry.chemical_classification Reactive oxygen species biology Public Health Environmental and Occupational Health General Medicine General Chemistry biology.organism_classification 030104 developmental biology chemistry Lead Green algae Growth inhibition Reactive Oxygen Species Water Pollutants Chemical |
| Zdroj: | Chemosphere. 147 |
| ISSN: | 1879-1298 |
| Popis: | In the natural environment, heavy metal contamination can occur as long-term pollution of sites or as pulses of pollutants from wastewater disposal. In this study two freshwater green algae, Chlorella sp. FleB1 and Scenedesmus YaA6, were isolated from lead-polluted water samples and the effects of 24 h vs 4 and 8 d exposure of cultures to lead on growth, photosynthetic physiology and production of reactive oxygen species (ROS) of these algae were investigated. In Chlorella sp. FleB1, there was agreement between lead impacts on chlorophyll content, photosynthesis and growth in most case. However, in Scenedesmus acutus YaA6 growth was inhibited at lower lead concentrations (0.03-0.87 × 10(-9) M), under which ROS, measured by 2',7' dichlorodihydrofluorescein diacetate fluorescence, were 4.5 fold higher than in controls but photosynthesis was not affected, implying that ROS had played a role in the growth inhibition that did not involve direct effects on photosynthesis. Effects of short-term (5 h, 24 h) vs long-term (4 d and 8 d) exposure to lead were also compared between the two algae. The results contribute to our understanding of the mechanisms of lead toxicity to algae. |
| Databáze: | OpenAIRE |
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