Extinction of cells of cyanobacterium Anabaena circinalis in the presence of humic acid under illumination

Applied Microbiology and Biotechnology
Bing-kun SunHajime Unno

Abstract

Laboratory experiments targeting the effect of humic acid (HA) on the cell lysis of cyanobacterium Anabaena circinalis have been performed. Light irradiation was found to be an important factor for the cell lysis phenomenon, whereas intracellular hydrogen peroxide (H2O2) might be a chemical factor for the process. An exogenous H2O2 concentration of 1.0 mg l(-1) was determined as the threshold for cell survival. Our results indicated that HA or its possible product(s) of photochemical reaction can induce damage to intracellular catalase under artificial illumination, which leads intracellular H2O2 to be accumulated to an abnormally high concentration, eventually resulting in cell death. Moreover, H2O2 released into the culture from dead cells can damage other cells, which in turn brings about the population extinction.

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Citations

Jul 14, 2011·Environmental Science and Pollution Research International·Hanno Bährs, Christian E W Steinberg
Sep 8, 2012·Environmental Science and Pollution Research International·Hanno BährsChristian E W Steinberg
Apr 26, 2011·Chemistry & Biology·Mohamed S Donia, Eric W Schmidt
May 26, 2017·The Science of the Total Environment·Aingeru MartínezAitor Larrañaga
Jan 1, 2007·Environmental Science and Pollution Research International·Almut Heinrich
Jun 7, 2021·Biotechnology for Biofuels·Mingcan WuJiangxin Wang

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