Journal
JOURNAL OF BIOSCIENCE AND BIOENGINEERING
Volume 119, Issue 2, Pages 159-164Publisher
SOC BIOSCIENCE BIOENGINEERING JAPAN
DOI: 10.1016/j.jbiosc.2014.07.014
Keywords
Chlorophyll fluorescence; Cyanobacteria; Photosystem I; Photosynthesis; Toxicity
Funding
- Program of 100 Distinguished Young Scientists of the Chinese Academy of Sciences [U1120302]
- National Natural Science Foundation of China [21177127]
- Specialized Research Fund for the Doctoral Program of Higher Education [20125303120003]
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Pollution with antibiotics poses a great risk to aquatic ecosystems. Although some toxic effects of antibiotics on photosystem II (PSII) have been documented, their toxicity to photosystem I (PSI) is still unclear. In this study, effects of ofloxacin on activities of both PSI and PSII of Microcystis aeruginosa (Kiitzing) Kfitzing were investigated. Exposure to 0.1 mg L-1 ofloxacin led to increases in contents of chlorophyll a and carotenoids and photosynthetic activity of M. aeruginosa. PSI activity and its electron transport were not affected by 0.1 mg L-1 ofloxacin. When M. aeruginosa was exposed to 10 mg L-1 ofloxacin, the electron transport rates of PSI and PSII, the yield of cyclic electron flow (CEF) and the contribution of linear electron flow (LEF) to PSI decreased whereas Y(NA) (limitation of donor side of PSI) and Y(NO) (the quantum yield of non-regulated energy dissipation in PSI!) significantly increased. CEF had a significant contribution to alleviating the inhibitory effect of ofloxacin on PSI of M. aeruginosa treated with low concentrations of ofloxacin. The protective role CEF for tolerance of PSI to the toxicity of ofloxacin decreased with increasing ofloxacin concentration. (C) 2014, The Society for Biotechnology, Japan. All rights reserved.
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