Higher sensitivity to hydrogen peroxide and light stress conditions of the microcystin producer Microcystis aeruginosa sp PCC7806 compared to non-producer strains.
Higher sensitivity to hydrogen peroxide and light stress conditions of the microcystin producer Microcystis aeruginosa sp PCC7806 compared to non-producer strains.
The increasing incidence of cyanobacterial blooms with their associated production of cyanotoxins lead managers of aquatics systems to control their biomass to limit the health risk. Among the variety of existing treatment approaches, hydrogen peroxide (H2O2) shows increasing use but the effects of environmental parameters on its effectiveness are still not completely known. With the aim to assess the efficiency of H2O2 treatments in the control of cyanobacterial blooms and decrease toxic risk, we tested three Microcystis strains according to their ability to produce cyanotoxins (a microcystin-producing, non-microcystin-producing and mcyB-knockout mutant). Photochemical efficiency, percentage of living cells and microcystin cell content were compared under various hydrogen peroxide concentrations coupled with stress conditions encountered during the life cycle of cyanobacteria as darkness and high light. The microcystin-producing strain appeared the more sensitive to hydrogen peroxide treatment and to light condition, probably due to a lower rate of repair of Photo System II (PSII). We also highlighted various responses of PSII activity according to Microcystis strains which could partly explain the shift of dominant genotypes often occurring during a bloom event. Our results confirm the link between light and microcystin content and variations of microcystin contents appear as a consequence of photosynthetic activity. These findings could be of particular interest regarding water quality management, especially the use of H2O2 as a potential algaecide which seems to be more effective to use during periods of high light.
Hydrogen peroxide, Light and oxidative stress, Microcystis, Photochemical efficiency, mcyB-knockout mutant, microcystin
Latour, Delphine
8c34215d-2fd3-4704-95f3-f379b63d5abd
Perriere, Fanny
54bdfd92-cb08-4059-9578-a685bca2fd69
Purdie, Duncan
18820b32-185a-467a-8019-01f245191cd8
May 2022
Latour, Delphine
8c34215d-2fd3-4704-95f3-f379b63d5abd
Perriere, Fanny
54bdfd92-cb08-4059-9578-a685bca2fd69
Purdie, Duncan
18820b32-185a-467a-8019-01f245191cd8
Latour, Delphine, Perriere, Fanny and Purdie, Duncan
(2022)
Higher sensitivity to hydrogen peroxide and light stress conditions of the microcystin producer Microcystis aeruginosa sp PCC7806 compared to non-producer strains.
Harmful Algae, 114, [102219].
(doi:10.1016/j.hal.2022.102219).
Abstract
The increasing incidence of cyanobacterial blooms with their associated production of cyanotoxins lead managers of aquatics systems to control their biomass to limit the health risk. Among the variety of existing treatment approaches, hydrogen peroxide (H2O2) shows increasing use but the effects of environmental parameters on its effectiveness are still not completely known. With the aim to assess the efficiency of H2O2 treatments in the control of cyanobacterial blooms and decrease toxic risk, we tested three Microcystis strains according to their ability to produce cyanotoxins (a microcystin-producing, non-microcystin-producing and mcyB-knockout mutant). Photochemical efficiency, percentage of living cells and microcystin cell content were compared under various hydrogen peroxide concentrations coupled with stress conditions encountered during the life cycle of cyanobacteria as darkness and high light. The microcystin-producing strain appeared the more sensitive to hydrogen peroxide treatment and to light condition, probably due to a lower rate of repair of Photo System II (PSII). We also highlighted various responses of PSII activity according to Microcystis strains which could partly explain the shift of dominant genotypes often occurring during a bloom event. Our results confirm the link between light and microcystin content and variations of microcystin contents appear as a consequence of photosynthetic activity. These findings could be of particular interest regarding water quality management, especially the use of H2O2 as a potential algaecide which seems to be more effective to use during periods of high light.
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More information
Submitted date: 3 January 2022
Accepted/In Press date: 25 February 2022
e-pub ahead of print date: 11 March 2022
Published date: May 2022
Additional Information:
Funding Information:
This work was supported by the National Oceanography Centre Southampton at the University of Southampton and Clermont Auvergne University .
Publisher Copyright:
© 2022 Elsevier B.V.
Keywords:
Hydrogen peroxide, Light and oxidative stress, Microcystis, Photochemical efficiency, mcyB-knockout mutant, microcystin
Identifiers
Local EPrints ID: 455935
URI: http://eprints.soton.ac.uk/id/eprint/455935
ISSN: 1568-9883
PURE UUID: 337832a7-1db1-47e3-889c-49cc10155c85
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Date deposited: 08 Apr 2022 17:54
Last modified: 17 Mar 2024 02:32
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Author:
Delphine Latour
Author:
Fanny Perriere
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