Effects of small water clusters on the growth and microcystin production of Microcystis aeruginosa |
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| Authors: | Ping Na Jing Wang Feng Zhao Baihua Chen Yanni Li Jian Zhuo |
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| Institution: | 1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
2. School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China |
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| Abstract: | Microcystis aeruginosa FACHB 905 was used as a model organism to study the effects of small water clusters (SWCs) on the growth and microcystin (MC) production of toxic cyanobacteria. The results showed that SWCs were able to stimulate the growth of Microcystis aeruginosa, which resulted in increased cell numbers and higher specific growth rates after a 30-d treatment. The cell morphology indicated that Microcystis aeruginosa was in a better state of growth, and it was more prone to divide in SWCs than in normal water clusters. The SWCs treatment up-regulated MC synthesis and exudation in 10 d in Microcystis aeruginosa, and the intra-cellular MC content decreased after the 20th day subsequently. Moreover, the cellular photosynthetic pigment contents were temporarily stimulated by SWCs. A possible reason is that SWCs stimulated the growth by promoting photosynthesis, whereas the increased MC production was relevant to pigment contents. |
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| Keywords: | small water clusters (SWCs) Microcystis aeruginosa microcystin secondary metabolism |
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