Inhibition Effect of Ionic Liquid [Hmim]Cl on Microcystis Growth and Toxin Production

Yang Liu, Yijie Zhang, Yousef Sultan, Peng Xiao, Li Yang, Hanyang Lu and Bangjun Zhang
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Yang Liu: College of Life Sciences, Henan Normal University, Xinxiang 453007, China
Yijie Zhang: College of Life Sciences, Henan Normal University, Xinxiang 453007, China
Yousef Sultan: College of Life Sciences, Henan Normal University, Xinxiang 453007, China
Peng Xiao: College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
Li Yang: Wuhan Imagination Science and Technology Development Co., Ltd., Wuhan 443000, China
Hanyang Lu: College of Life Sciences, Henan Normal University, Xinxiang 453007, China
Bangjun Zhang: College of Life Sciences, Henan Normal University, Xinxiang 453007, China

IJERPH, 2022, vol. 19, issue 14, 1-9

Abstract: Ionic liquids (ILs) are known as “green solvents” and widely used in industrial applications. However, little research has been conducted on cyanobacteria. This study was conducted to investigate the toxicity of ionic liquids ([Hmim]Cl) on Microcystis aeruginosa PCC7806. The EC 50 (72 h) of [Hmim]Cl on the growth of Microcystis aeruginosa PCC 7806 was 10.624 ± 0.221 mg L −1 . The possible mechanism of toxicity of [Hmim]Cl against M. aeruginosa PCC 7806 was evaluated by measuring cell growth, photosynthetic pigment contents, chlorophyll fluorescence transients, cell ultrastructure, and transcription of the microcystin-producing gene ( mcyB ). The concentrations of chlorophyll a and carotenoids were significantly reduced in treated M. aeruginosa cultures. The results of chlorophyll fluorescence transients showed that [Hmim]Cl could destruct the electron-accepting side of the photosystem II of M. aeruginosa PCC 7806. Transmission electron microscopy demonstrated cell damage including changes in the structure of the cell wall and cell membrane, thylakoid destruction, and nucleoid disassembly. The transcription of the mcyB gene was also inhibited under [Hmim]Cl stress. In summary, this study provides new insights into the toxicity of [Hmim]Cl on cyanobactreia.

Keywords: [Hmim]Cl; toxicology; aquatic ecosystem; microorganism; photosynthesis (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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