Toxin release in response to oxidative stress and programmed cell death in the cyanobacterium Microcystis aeruginosa

Ross, Cliff; Santiago-Vázquez, Lory Z.; Paul, Valerie J.

doi:10.1016/j.aquatox.2006.02.007

Cited by 215 publications

(120 citation statements)

References 62 publications

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“…A similar finding has been reported for KMnO 4 preoxidation with subsequent extended transportation time (Qi et al, 2016). This result can be explained by the programmed cell death (PCD) theory (Ross et al, 2006), which can induce the rapid collapse of algae (Kaneko et al, 2007;Frangeul et al, 2008). PCD can be caused by oxidative stress, ultraviolet irradiation, nutrient deprivation, salt stress, and heat (Bidle and Falkowski, 2004;Bidle et al, 2007), and finally lead the cells to perform genetically controlled cell suicide (Ameisen, 2002).…”

Section: Effects Of Simulated Transportation Time On Cell Integrity Asupporting

confidence: 62%

Prechlorination of algae-laden water: The effects of transportation time on cell integrity, algal organic matter release, and chlorinated disinfection byproduct formation

Lan

Liu

et al. 2016

Water Research

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a b s t r a c tThe prechlorination-induced algal organic matter (AOM) released from Microcystis aeruginosa (M. aeruginosa) cells has been reported to serve as a source of precursors for chlorinated disinfection byproducts (DBPs). However, previous studies have mainly focused on the precursors either extracted directly from the cell suspension or derived immediately after algal suspension prechlorination. This study aims to investigate the impacts of water transportation time after algal suspension prechlorination on cell integrity, AOM release, and DBP formation during the dissolved phase chlorination. The damage to cell integrity after prechlorination was indicated to depend not only on chlorine dose but also on transportation time. The highest dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) values were observed at 2 mg/L chlorine preoxidation before transportation, but were obtained at 0.4 mg/L chlorine after 480-min simulated transportation. The variation of DON with transportation time was indicated to be mainly influenced by the small molecular weight nitrogenous organic compounds, such as amino acids. Additionally, formation of the corresponding chlorinated carbonaceous disinfection byproducts (C-DBPs) and nitrogenous disinfection byproducts (N-DBPs) during the dissolved phase chlorination showed the same variation tendency as DOC and DON respectively. The highest C-DBP (98.4 mg/L) and N-DBP (5.5 mg/L) values were obtained at 0.4 mg/L chlorine preoxidation after 480-min simulated transportation. Therefore, when prechlorination is applied for algae-laden water pretreatment, not only chlorine dose but also transportation time needs to be considered with regard to their effects on cell integrity, AOM release, and chlorinated DBP formation.

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Section: Effects Of Simulated Transportation Time On Cell Integrity Asupporting

confidence: 62%

Prechlorination of algae-laden water: The effects of transportation time on cell integrity, algal organic matter release, and chlorinated disinfection byproduct formation

Lan

Liu

et al. 2016

Water Research

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“…five-times that of dissolved (extracellular) concentrations. Extracellular concentrations did approximate or exceed (up to fourtimes that of) intracellular concentrations at select offshore stations, signifying a localized release of cellular toxin within a senescing cyanobacterial community (e.g., Ross et al 2006). Alternatively, as suggested by Kaebernick et al (2000), an increase in extracellular microcystin may arise from active toxin release upon cell exposure to an unidentified (high) irradiance threshold.…”

Section: Cyanobacterial Toxicitymentioning

confidence: 99%

Late-summer phytoplankton in western Lake Erie (Laurentian Great Lakes): bloom distributions, toxicity, and environmental influences

et al. 2009

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Phytoplankton abundance and composition and the cyanotoxin, microcystin, were examined relative to environmental parameters in western Lake Erie during late-summer (2003)(2004)(2005). Spatially explicit distributions of phytoplankton occurred on an annual basis, with the greatest chlorophyll (Chl) a concentrations occurring in waters impacted by Maumee River inflows and in Sandusky Bay. Chlorophytes, bacillariophytes, and cyanobacteria contributed the majority of phylogenetic-group Chl a basin-wide in 2003, 2004, and 2005, respectively. Water clarity, pH, and specific conductance delineated patterns of group Chl a, signifying that water mass movements and mixing were primary determinants of phytoplankton accumulations and distributions. Water temperature, irradiance, and phosphorus availability delineated patterns of cyanobacterial biovolumes, suggesting that biotic processes (most likely, resource-based competition) controlled cyanobacterial abundance and composition. Intracellular microcystin concentrations corresponded to Microcystis abundance and environmental parameters indicative of conditions coincident with biomass accumulations. It appears that environmental parameters regulate microcystin indirectly, via control of cyanobacterial abundance and distribution.

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“…For example, the use of paraquat (1 mM) resulted in a 90 % increase in detectable toxins (Ross et al 2006). This is a potential general drawback of cyanocide application.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…While these algicides are very effective as non-specific cyanocides, a warning has been published that the use of paraquat (at 1 mM final concentration) resulted in a 90 % increase in detectable cyanotoxins in the water (Ross et al 2006). This potential cyanotoxin release from dying cells of cyanobacteria after treatment with algicides is a general problem (cf.…”

Section: Herbicidesmentioning

confidence: 99%

Existing and emerging cyanocidal compounds: new perspectives for cyanobacterial bloom mitigation

et al. 2016

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To help ban the use of general toxic algicides, research efforts are now directed towards the discovery of compounds that are specifically acting as cyanocides. Here, we review the past and look forward into the future, where the less desirable general algicides like copper sulphate, diuron or endothall may become replaced by compounds that show better specificity for cyanobacteria and are biodegradable or transform into non-toxic products after application. For a range of products, we review the activity, the mode of action, effectiveness, durability, toxicity towards non-target species, plus costs involved, and discuss the experience with and prospects for small water volume interventions up to the mitigation of entire lakes; we arrive at recommendations for a series of natural products and extracted organic compounds or derived synthetic homologues with promising cyanocidal properties, and briefly mention emerging nanoparticle applications. Finally, we detail on the recently introduced application of hydrogen peroxide for the selective killing of cyanobacteria in freshwater lakes.

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Toxin release in response to oxidative stress and programmed cell death in the cyanobacterium Microcystis aeruginosa

Cited by 215 publications

References 62 publications

Prechlorination of algae-laden water: The effects of transportation time on cell integrity, algal organic matter release, and chlorinated disinfection byproduct formation

Prechlorination of algae-laden water: The effects of transportation time on cell integrity, algal organic matter release, and chlorinated disinfection byproduct formation

Late-summer phytoplankton in western Lake Erie (Laurentian Great Lakes): bloom distributions, toxicity, and environmental influences

Existing and emerging cyanocidal compounds: new perspectives for cyanobacterial bloom mitigation

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