Abstract
As a common pollutant, nitrite concentrations can approach 15 mg NO2−-N L−1 in some aquatic systems. Microcystis aeruginosa blooms are common and widespread in eutrophic freshwater bodies. In this study, M. aeruginosa was exposed to nitrite concentrations ranging from 0 to 15 mg NO2−-N L−1, and the responses of M. aeruginosa were investigated. The specific growth rates, maximum cell densities, light-saturated photosynthetic rates (Pm
chla
), dark respiration rates (Rd
chla
), and apparent photosynthetic efficiencies (αchla
) showed a significant decline with nitrite concentrations increasing. Electrical conductivity and malondialdehyde contents
investigation revealed cell membrane damage and apparent leakage of intracellular contents under high nitrite level conditions
due to oxidative stress enhancement. Intracellular microcystin (MC)-LR content reached the highest value at 10 mg NO2−-N L−1; however, extracellular MC-LR contents showed a continuous increase until 15 mg NO2−-N L−1 owing to the increasing leakage of intracellular contents. These results elucidated that the high-level nitrite inhibited
M. aeruginosa growth by rising oxidative stress, damaging cell membrane, and reducing photosynthesis. However, the moderate increase in
nitrite concentrations promoted toxin production and release of toxin.
chla
), dark respiration rates (Rd
chla
), and apparent photosynthetic efficiencies (αchla
) showed a significant decline with nitrite concentrations increasing. Electrical conductivity and malondialdehyde contents
investigation revealed cell membrane damage and apparent leakage of intracellular contents under high nitrite level conditions
due to oxidative stress enhancement. Intracellular microcystin (MC)-LR content reached the highest value at 10 mg NO2−-N L−1; however, extracellular MC-LR contents showed a continuous increase until 15 mg NO2−-N L−1 owing to the increasing leakage of intracellular contents. These results elucidated that the high-level nitrite inhibited
M. aeruginosa growth by rising oxidative stress, damaging cell membrane, and reducing photosynthesis. However, the moderate increase in
nitrite concentrations promoted toxin production and release of toxin.
- Content Type Journal Article
- DOI 10.1007/s10811-010-9558-y
- Authors
- Weimin Chen, Henan University College of Environment and Planning Kaifeng 475004 People’s Republic of China
- Hao Liu, Tianjin University of Technology Engineering Training Center Tianjin 300384 People’s Republic of China
- Qingmin Zhang, Nankai University College of Environmental Science and Engineering Tianjin 300071 People’s Republic of China
- Shugui Dai, Nankai University College of Environmental Science and Engineering Tianjin 300071 People’s Republic of China
- Journal Journal of Applied Phycology
- Online ISSN 1573-5176
- Print ISSN 0921-8971
No comments:
Post a Comment