Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 283, Issue -, Pages 447-453Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2014.09.053
Keywords
Microcystin; UV-B; Toxin production; Competition
Categories
Funding
- National Natural Science Foundation of China [31200296, 31200353]
- 135 key point overall project of Nanjing Institute of Geography and Limnology, CAS [NIGLAS2012135010]
- CAS International Partnership Creative Group [KZZD-EW-TZ-08-01]
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Microcystins (MCs) produced by toxic cyanobacteria pose a health hazard to humans and animals. Some environmental factors can alter the MC concentrations by affecting the abundance of toxin-producing strains in a cyanobacteria population and/or their toxin production. In this study, we designed a monoculture and competition experiment to investigate the impacts of UV-B radiation on MC production and the competition between toxin and non-toxin producing strains of Microcystis aeruginosa. UV-B radiation resulted in higher inhibition of the growth and photosynthetic activity of the non-toxin producing strain relative to that observed for the toxin-producing strain. Both intracellular and extracellular MC contents decreased markedly when the toxin-producing strain was exposed to UV-B radiation. In addition, a quantitative real-time PCR assay revealed that the ratio of toxin-producing M. aeruginosa under UV-B exposure was higher than that under PAR alone at an early stage of the experiment. However, its abundance under UV-B exposure was lower compared with the PAR alone treatment after day 12. Our study demonstrated that UV-B radiation has a great impact on the abundance of the toxin-producing strain in the Microcystis population and their toxin production, which suggests that the fluctuation of UV-B radiation affects the MC level of cyanobacteria blooms. (C) 2014 Elsevier B.V. All rights reserved.
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