Physiological effects of the herbicide glyphosate on the cyanobacterium Microcystis aeruginosa

Wu, Liang; Qiu, Zhihao; Zhou, Ya; Du, Yang; Liu, Chaonan; Ye, Jing; Hu, Xiaojun

doi:10.1016/j.aquatox.2016.07.010

Cited by 81 publications

(43 citation statements)

References 40 publications

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“…Glyphosate was also observed to inhibit cyanobacterial growth via the photosynthesis system, including preventing chlorophyll a synthesis and reducing photosynthetic activity (Wu et al. , Smedbol et al. ).…”

Section: Discussionmentioning

confidence: 99%

“…However, glyphosate was found to stimulate the synthesis of MCs (Wu et al. ). The present study observed similar results as reported in previous studies; that is, the synthesis of the MCs was reduced by H 2 O 2 at the highest exposure dose while enhanced by glyphosate.…”

Section: Discussionmentioning

confidence: 99%

“…, Wu et al. ). For instance, increased malondialdehyde (MDA) content and restrained activities of superoxide dismutase (SOD) were observed in Microcystis aeruginosa exposed to 5–20 mg · L −1 H 2 O 2 for 72 h (Chen et al.…”

mentioning

confidence: 99%

“…Exposure to 40–60 mg · L −1 glyphosate increased the MDA content and activity of SOD in M. aeruginosa (Wu et al. ). Recent studies have indicated that antibiotics could also affect the antioxidant system of cyanobacteria (Liu et al.…”

mentioning

confidence: 99%

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Influence of mixed antibiotics on Microcystis aeruginosa during the application of glyphosate and hydrogen peroxide algaecides

Liu

Zhang

et al. 2019

Journal of Phycology

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Antibiotics regulate various physiological functions in cyanobacteria and may interfere with the control of cyanobacterial blooms during the application of algaecides. In this study, Microcystis aeruginosa was exposed to H2O2 and glyphosate for 7 d in the presence of coexisting mixed antibiotics (amoxicillin, spiramycin, tetracycline, ciprofloxacin, and sulfamethoxazole) at an environmentally relevant concentration of 100 ng · L−1. The mixed antibiotics significantly (P < 0.05) alleviated the growth inhibition effect of 15–45 μM H2O2 and 40–60 mg · L−1 glyphosate. According to the increased contents of chlorophyll a and protein, decreased content of malondialdehyde, and decreased activities of superoxide dismutase and glutathione S‐transferase, antibiotics may reduce the toxicity of the two algaecides through the stimulation of photosynthesis and the reduction in oxidative stress. The presence of coexisting antibiotics stimulated the production and release of microcystins in the M. aeruginosa exposed to low concentrations of algaecides and posed an increased threat to aquatic environments. To eliminate the secondary pollution caused by microcystins, high algaecide doses that are ≥45 μM for H2O2 and ≥60 mg · L−1 for glyphosate are recommended. This study provides insights into the ecological hazards of antibiotic contaminants and the best management practices for cyanobacterial removal under combined antibiotic pollution conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Influence of mixed antibiotics on Microcystis aeruginosa during the application of glyphosate and hydrogen peroxide algaecides

Liu

Zhang

et al. 2019

Journal of Phycology

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“…According to our previous studies [35,38], MC-LR is released from cells after 48 h of exposure. Therefore, this time point has been chosen in the present work.…”

Section: Mc-lr Analysismentioning

confidence: 99%

Toxin Release of Cyanobacterium <em>Microsystis aeruginosa</em> after Exposure to Typical Tetracycline Antibiotic Contaminants

Wang

et al. 2017

Preprint

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The global usage of veterinary antibiotics is significant. Antibiotics can be released into aquatic environments and elicit toxic effects on non-target organisms. In this study, the growth characteristics and toxin release of the cyanobacterium Microcystis aeruginosa (M. aeruginosa) were examined to investigate the physiological effects of tetracycline antibiotics on aquatic life. Results showed that the degree of toxicities of the following target antibiotics was TC (tetracycline hydrochloride) > CTC (chlortetracycline hydrochloride) > OTC (oxytetracycline hydrochloride) in terms of growth parameters, EC10 (0.63, 1.86, and 3.02 mg/L, respectively), and EC20 (1.58, 4.09, and 4.86 mg/L, respectively) values. These antibiotics inhibited the production of microcystin-LR (MC-LR) to varying degrees. CTC interfered M. aeruginosa cells and decreased their ability to release MC-LR, but this antibiotic stimulated the ability of these cells to synthesize MC-LR at 2 and 5 mg/L. OTC elicited a relatively weaker toxicity than CTC did and reduced MC-LR release. TC was the most toxic among the three antibiotics, and this antibiotic simultaneously reduced intracellular and extracellular MC-LR equivalents. Our results helped elucidate the effects of tetracycline antibiotics on M. aeruginosa, which is essential for environmental evaluation and protection. Our results are also helpful for guiding the application of veterinary antibiotics in agricultural settings.

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Impacts of Potassium Permanganate and Powdered Activated Carbon on Cyanotoxin Release

2018

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Bench-scale trials were performed to (1) expose Microcystis aeruginosa cells to potassium permanganate (KMnO 4 ) doses of 1, 3, and 5 mg/L at contact times (CTs) of 15, 30, and 90 min, pH levels of 7 and 9, and turbidities of 0.1, 5, and 20 ntu, respectively;(2) compare the impacts of oxidation alone and oxidation plus powdered activated carbon (PAC) for the final 60 min of CT; and (3) evaluate the impact of these treatment conditions on extracellular microcystins (MCs), extra-plus intracellular (combined) MCs, cell membrane integrity, and chlorophyll a concentrations. Toxin releases from the cells were observed at both pH levels. The greatest toxin releases were observed at the lowest KMnO 4 doses. The toxin releases were accompanied by relatively stable total cell counts, increases in membrane-compromised cells, and decreases in chlorophyll a. The application of 10 mg/L PAC resulted in extracellular toxin concentrations that were markedly lower than those observed in oxidant-only situations.

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Physiological effects of the herbicide glyphosate on the cyanobacterium Microcystis aeruginosa

Cited by 81 publications

References 40 publications

Influence of mixed antibiotics on Microcystis aeruginosa during the application of glyphosate and hydrogen peroxide algaecides

Influence of mixed antibiotics on Microcystis aeruginosa during the application of glyphosate and hydrogen peroxide algaecides

Toxin Release of Cyanobacterium <em>Microsystis aeruginosa</em> after Exposure to Typical Tetracycline Antibiotic Contaminants

Impacts of Potassium Permanganate and Powdered Activated Carbon on Cyanotoxin Release

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