Response of the cyanobacterium Microcystis flos-aquae to levofloxacin
2014
Wan, Jinjin | Guo, Peiyong | Zhang, Shengxiang
The effects of levofloxacin (LEV) on Microcystis flos-aquae and its mechanism were investigated by determining the responses of some parameters of M. flos-aquae to LEV stress, including growth inhibition ratio, chlorophyll a content, superoxide dismutase (SOD) and catalase (CAT) activities, malondialdehyde (MDA) content, Fᵥ/F₀and Fᵥ/Fₘ, etc. The results indicated that LEV at 0.001–0.1 μg L⁻¹could stimulate the growth of M. flos-aquae and increase the chlorophyll a content but did not induce a significant increase in the activity of antioxidant enzymes (SOD and CAT) and the content of MDA. When the LEV concentration exceeds 10 μg L⁻¹, the growth of M. flos-aquae could be significantly inhibited (the highest inhibition ratio can be up to 88.38 % at 100 μg L⁻¹) and chlorophyll a content, SOD and CAT activities, and MDA content also significantly decreased in a concentration-dependent manner, indicating that high concentrations of LEV caused a severe oxidative stress on algal cells, resulting in a large number of reactive oxygen species produced in algal cells and thereby inhibiting the growth of algae. At the same time, the Fᵥ/Fₘand Fᵥ/F₀values of M. flos-aquae decreased significantly with both exposure time and increasing test concentration of LEV, showing that the process of photosynthesis was inhibited.
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