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The harmful cyanobacterium Microcystis aeruginosa PCC7806 is more resistant to hydrogen peroxide at elevated CO2

文献类型： 外文期刊

作者： Qin, Hongjie 1 ; Sandrini, Giovanni 2 ; Piel, Tim 2 ; Slot, Pieter C. 2 ; Huisman, Jef 2 ; Visser, Petra M. 2 ;

作者机构： 1.Guangdong Acad Agr Sci, Environm Hort Res Inst, Guangdong Prov Key Lab Ornamental Plant Germplasm, Guangzhou 510640, Peoples R China

2.Univ Amsterdam, Inst Biodivers & Ecosyst Dynam, Dept Freshwater & Marine Ecol, POB 94240, NL-1090 GE Amsterdam, Netherlands

3.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Peoples R China

4.Evides Water Co, Dept Technol & Sources, Rotterdam, Netherlands

关键词： Microcystin; Oxidative stress; Rising CO 2; Harmful algal blooms; Photosynthetic yield; Climate change

期刊名称：HARMFUL ALGAE （ 影响因子：6.6； 五年影响因子：5.6 ）

ISSN： 1568-9883

年卷期： 2023 年 128 卷

页码：

收录情况： SCI

摘要： Rising atmospheric CO2 can intensify harmful cyanobacterial blooms in eutrophic lakes. Worldwide, these blooms are an increasing environmental concern. Low concentrations of hydrogen peroxide (H2O2) have been proposed as a short-term but eco-friendly approach to selectively mitigate cyanobacterial blooms. However, sensitivity of cyanobacteria to H2O2 can vary depending on the available resources. To find out how cyanobacteria respond to H2O2 under elevated CO2, Microcystis aeruginosa PCC 7806 was cultured in chemostats with nutrient-replete medium under C-limiting and C-replete conditions (150 ppm and 1500 ppm CO2, respectively). Microcystis chemostats exposed to high CO2 showed higher cell densities, biovolumes, and microcystin contents, but a lower photosynthetic efficiency and pH compared to the cultures grown under low CO2. Subsamples of the chemostats were treated with different concentrations of H2O2 (0-10 mg & BULL;L-1 H2O2) in batch cultures under two different light intensities (15 and 100 & mu;mol photons m- 2 & BULL;s- 1) and the response in photosynthetic vitality was monitored during 24 h. Results showed that Microcystis was more resistant to H2O2 at elevated CO2 than under carbon-limited conditions. Both low and high CO2-adapted cells were more sensitive to H2O2 at high light than at low light. Microcystins (MCs) leaked out of the cells of cultures exposed to 2-10 mg & BULL;L-1 H2O2, while the sum of intra- and extracellular MCs decreased. Although both H2O2 and CO2 concentrations in lakes vary in response to many factors, these results imply that it may become more difficult to suppress cyanobacterial blooms in eutrophic lakes when atmospheric CO2 concentrations continue to rise.

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