High sensitivity of cyanobacterium <i>Microcystis aeruginosa</i> to copper and the prediction of copper toxicity

Zeng, Jin; Yang, Liuyan; Wang, Wen‐Xiong

doi:10.1002/etc.266

Cited by 14 publications

(2 citation statements)

References 41 publications

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“…Such concentrations are lethal to sensitive species of cyanobacteria and plants. 5,153 This type of contamination has drastically decreased due to better industrial practices and wastewater treatment. The second source of severe copper contamination, in aquatic ecosystems as well as in soils, however, remains (see Table 1).…”

Section: Toxicity Of Biologically Redox-active Metal Ionsmentioning

confidence: 99%

Mechanisms of metal toxicity in plants

2016

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Metal toxicity in plants is still a global problem for the environment, agriculture and ultimately human health. This review initially addresses the current state of the environmental/agricultural problem, and then discusses in detail the occurrence, mechanisms and relevance of toxicity of selected trace metals (Cd, Cu, Fe, Hg, Ni, and Zn). When discussing the mechanisms, special emphasis is laid on a critical review of their environmental/agricultural relevance, because even now many studies in this field of research are performed under highly artificial lab conditions. The main problems outlined in published studies are artificially high metal concentrations (which never occur even in highly polluted sites) combined with too short treatment times, as well as environmentally and agriculturally irrelevant growth conditions (e.g. constant light and submerged cultivation of seedlings). Furthermore, wherever possible an attempt is made to link the mechanisms published to date in terms of discussing which mechanisms are a direct cause of the observed disturbance of plant function and which are rather a consequence of the primary mechanisms, leading to a complicated toxicity phenotype and ultimately to diminished growth or even death of the plants.

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Section: Toxicity Of Biologically Redox-active Metal Ionsmentioning

confidence: 99%

Mechanisms of metal toxicity in plants

2016

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“…It has been generally accepted that phytoplankton absorb Cu from surrounding water following the free ion activity model (FLAM), the same pattern as the other trace metals (Sunda and Guillard, 1976). Therefore, Cu uptake in phytoplankton relies on many environmental conditions, including pH (Zeng et al, 2010), salinity (Gonzalez-Davila et al, 1995), nutrients (Miao and Wang, 2007) and so on. Previous studies usually focused on the toxic effects of Cu, in which the free Cu activities [Cu 2+ ] usually ranged from 10 -12 -10 -8 mol L -1 .…”

Section: Introductionmentioning

confidence: 99%

Copper uptake and subcellular distribution in five marine phytoplankton species

2022

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Copper (Cu) uptake and trophic transfer in marine plankton at the environmentally relevant levels have rarely been investigated. In this study, we investigated the Cu uptake and subcellular distribution in five phytoplankton (Isochrysis zhanjiangensis, Phaeocystis sp., Isochrysis galbana, Chaetoceros sp. and Phaeodactylum tricornutum) belonging to two taxa Chrysophyta and Bacillariophyta, and the following trophic transfer to rotifer Brachionus plicatilis by using stable isotope tracing method. In 2-hour exposure, Cu uptake rates were 20.8–60.3 amol h-1 cell-1 (amol = 10-18 mol) in the phytoplankton exposure to 4.82 × 10-13 mol L-1 free Cu activity ([Cu2+]). Cu uptake rates were increased with the increase of [Cu2+] in all the phytoplankton species. Generally, Cu uptake rate constants (kus) were lower in Bacillariophyta (Chaetoceros sp. and P. tricornutum) than Chrysophyta (I. zhanjiangensis, Phaeocystis sp. and I. galbana). While in long-term (6 day) exposure, more Cu was accumulated in the Bacillariophyta than in Chrysophyta, suggesting Bacillariophyta might have more Cu capacity than Chrysophyta. Size effects of cells on Cu uptake were not observed among these five phytoplankton. Cu was mainly distributed in the heat-denatured protein plus organelle fraction and head-stable protein fraction in all the five phytoplankton. The Cu assimilation efficiencies (AEs) in rotifer feeding I. zhanjiangensis, Phaeocystis sp., I. galbana, Chaetoceros sp. and P. tricornutum were 63.4%, 57.6%, 60.2%, 77.4% and 14.6%, respectively. These Cu AEs were positively correlated to the Cu distribution in the trophically available metal fraction (TAM) in different phytoplankton. These results herein demonstrated that different marine phytoplankton had different strategies to accumulate Cu that influence Cu transfer to the predators. Therefore, the variation of the phytoplankton community will change the Cu biogeochemistry in marine environment.

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The Effects of Three Chemical Algaecides on Cell Numbers and Toxin Content of the Cyanobacteria Microcystis aeruginosa and Anabaenopsis sp.

Greenfield

Duquette

Goodson

et al. 2014

Environmental Management

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Toxic cyanobacteria blooms are a growing concern for public health and safety, due in part to the production of the hepatotoxin microcystin by certain species, including Microcystis aeruginosa. Management strategies for controlling cyanobacteria blooms include algaecide treatments, often with copper sulfate, and more recently oxidizers such as sodium percarbonate that produce hydrogen peroxide. This study assessed the effects of two copper-containing algaecides and one sodium percarbonate-containing algaecide on mitigating cell numbers and toxin content of cultured M. aeruginosa and summer (July) bloom samples of Anabaenopsis sp. in a brackish stormwater detention pond. Monitoring of the bloom revealed that Anabaenopsis sp. was associated with elevated levels of orthophosphate compared to nitrogen (dissolved inorganic nitrogen to phosphorus ratios were 0.19-1.80), and the bloom decline (September-October) was likely due to lower autumn water temperatures combined with potential grazing by the dinoflagellate Protoperidinium quinquecorne. Laboratory-based algaecide experiments included three dose levels, and cyanobacteria cell numbers and microcystin concentrations (particulate and dissolved) were evaluated over 7 d. Following exposure, copper-containing treatments generally had lower cell numbers than either sodium percarbonate-containing or control (no algaecide) treatments. Addition of algaecides did not reduce overall microcystin levels, and a release of toxin from the particulate to dissolved phase was observed in most treatments. These findings indicate that algaecide applications may visibly control cyanobacteria bloom densities, but not necessarily toxin concentrations, and have implications for public health and safety.

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High sensitivity of cyanobacterium Microcystis aeruginosa to copper and the prediction of copper toxicity

Cited by 14 publications

References 41 publications

Mechanisms of metal toxicity in plants

Mechanisms of metal toxicity in plants

Copper uptake and subcellular distribution in five marine phytoplankton species

The Effects of Three Chemical Algaecides on Cell Numbers and Toxin Content of the Cyanobacteria Microcystis aeruginosa and Anabaenopsis sp.

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