Journal
AQUATIC TOXICOLOGY
Volume 186, Issue -, Pages 67-76Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aquatox.2017.02.022
Keywords
Phenicol antibiotics; Cyanobacterium; Chlorophyll a; Electron transport rate; Antioxidant system
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Funding
- National Natural Science Foundation of China [20777021]
- Ministry of Education, Key Research Project of Science and Technology [210253]
- Natural Science Foundation of Fujian Province of China [2010J01043]
- Quanzhou Project of Science and Technology [2014Z110]
- Jinjiang Key Project of Science and Technology [2013S002]
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Florfenicol (FF) and thiamphenicol (TAP) are two typical pharmaceuticals used widely as therapeutica antibiotic agents in aquaculture. However, little is known about the potential adverse effects of these two antibiotics on non-target organisms in the aquatic ecosystem. In this study we investigated the effects of FF and TAP on photosynthesis and the antioxidant system of the cyanobacteria Microcystisflos-aquae. Over a concentration range of 0.001-1 mu g/L, the results showed that both FF and TAP significantly increased the chlorophyll a content of M. flos-aquae, while the superoxide dismutase (SOD) activity, catalase (CAT)activity and the levels of malondialdehyde (MDA) changed slightly. In contrast, the chlorophyll a content of M. flos-aqua was significantly inhibited (p < 0.01) at high concentrations (>1 mu g/L) of FF and TAP, reaching a 46% inhibition level at 50 mu g/LFF and 56% inhibition at 100 mu g/LTAP. At the same time, the activities of SOD and CAT along with MDA content also increased significantly (p < 0.01), indicating that the high concentrations of both FF and TAP led to oxidative stress in the algae. In addition, the M. flos-aquae fluorescence parameters (Fv/Fm, Fv/Fo, alpha, ETRmax and Ik) increased with increasing concentration of both FF and TAP, which may be the result of the increasing photoprotection capacity. (C) 2017 Elsevier B.V. All rights reserved.
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