Combined effects of microplastics and excess boron on Microcystis aeruginosa

Zhang, Chen; Lin, X.; Gao, Panpan; Xu, Zhenghao; Ma, Chunhua; Wang, Lei; Sun, Hongwen; Sun, Lianpeng

doi:10.1016/j.scitotenv.2023.164298

Cited by 9 publications

(2 citation statements)

References 56 publications

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“…Algae are essential component of aquatic ecosystems. 5 Microcystis aeruginosa is one of the most widely distributed algae, which plays a crucial role in the aquatic environment. 6 As primary producers, algae's photosynthetic activity aerates the aquatic ecosystem.…”

Section: ■ Introductionmentioning

confidence: 99%

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Repeated Exposure Enhanced Toxicity of Clarithromycin on Microcystis aeruginosa Versus Single Exposure through Photosynthesis, Oxidative Stress, and Energy Metabolism Shift

Mao,

Ye,

Yang

et al. 2024

Environ. Sci. Technol.

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Antibiotics are being increasingly detected in aquatic environments, and their potential ecological risk is of great concern. However, most antibiotic toxicity studies involve single-exposure experiments. Herein, we studied the effects and mechanisms of repeated versus single clarithromycin (CLA) exposure on Microcystis aeruginosa. The 96 h effective concentration of CLA was 13.37 μg/L upon single exposure but it reduced to 6.90 μg/L upon repeated exposure. Single-exposure CLA inhibited algal photosynthesis by disrupting energy absorption, dissipation and trapping, reaction center activation, and electron transport, thereby inducing oxidative stress and ultrastructural damage. In addition, CLA upregulated glycolysis, pyruvate metabolism, and the tricarboxylic acid cycle. Repeated exposure caused stronger inhibition of algal growth via altering photosynthetic pigments, reaction center subunits biosynthesis, and electron transport, thereby inducing more substantial oxidative damage. Furthermore, repeated exposure reduced carbohydrate utilization by blocking the pentose phosphate pathway, consequently altering the characteristics of extracellular polymeric substances and eventually impairing the defense mechanisms of M. aeruginosa. Risk quotients calculated from repeated exposure were higher than 1, indicating significant ecological risks. This study elucidated the strong influence of repeated antibiotic exposure on algae, providing new insight into antibiotic risk assessment.

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Section: ■ Introductionmentioning

confidence: 99%

“…Algae are essential component of aquatic ecosystems Microcystis aeruginosa is one of the most widely distributed algae, which plays a crucial role in the aquatic environment .…”

Section: Introductionmentioning

confidence: 99%

Repeated Exposure Enhanced Toxicity of Clarithromycin on Microcystis aeruginosa Versus Single Exposure through Photosynthesis, Oxidative Stress, and Energy Metabolism Shift

Mao,

Ye,

Yang

et al. 2024

Environ. Sci. Technol.

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Effects of PET and Gallic Acid on Growth, Photosynthesis, and Oxidative Stress of Microcystis aeruginosa

Wang,

Liu

2024

Water Air Soil Pollut

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The comparative effects of visible light and UV-A radiation on the combined toxicity of P25 TiO2 nanoparticles and polystyrene microplastics on Chlorella sp.

Rex M,

Mukherjee

2023

Environ Sci Pollut Res

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The ubiquitous presence of TiO 2 nanoparticles (nTiO 2 ) and microplastics (MPs) in marine ecosystems has raised serious concerns about their combined impact on marine biota. In the natural environment, marine microalgae can interact with mixtures of nTiO 2 and MPs under both visible light and UV-A radiation conditions. However, most of the previous toxicity studies employed visible light conditions, so the in uence of UV-A radiation on toxicity remains poorly understood. To address this gap, the current study aimed to compare the effects of visible light and UV-A radiation on the combined toxic effects of nTiO 2 and polystyrene microplastics (PSMPs) in the marine microalga Chlorella sp using arti cial seawater directly as the test medium. Our results demonstrated that under UV-A radiation the algal growth inhibition was signi cantly enhanced compared to that in visible light conditions. The mixtures of nTiO 2 and PSMPs exhibited signi cant enhanced toxicity than their pristine forms. Speci cally, the mixtures of nTiO 2 and NH 2 -functionalized PSMPs (10mg/L) showed higher toxicity to algae than the mixtures with COOH-functionalized PSMPs (10mg/L). Furthermore, UV-A radiation exacerbated the hetero aggregation between algae and pollutants. The photoactive nTiO 2 , promoted increased production of reactive oxygen species under UV-A exposure resulting in cellular damage, lipid peroxidation, and impaired photosynthesis. The effects were more pronounced in case of the mixtures where PSMPs added to the oxidative stress. The toxic effects of the binary mixtures of nTiO 2 and PSMPs were further con rmed through the Field Emission Electron Microscopy, revealing speci c morphological abnormalities. This study provides valuable insights into the potential risks associated with the combination of nTiO 2 and MPs in marine environments, considering the in uence of environmentally relevant light conditions and the test medium.

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Combined effects of microplastics and excess boron on Microcystis aeruginosa

Cited by 9 publications

References 56 publications

Repeated Exposure Enhanced Toxicity of Clarithromycin on Microcystis aeruginosa Versus Single Exposure through Photosynthesis, Oxidative Stress, and Energy Metabolism Shift

Repeated Exposure Enhanced Toxicity of Clarithromycin on Microcystis aeruginosa Versus Single Exposure through Photosynthesis, Oxidative Stress, and Energy Metabolism Shift

Effects of PET and Gallic Acid on Growth, Photosynthesis, and Oxidative Stress of Microcystis aeruginosa

The comparative effects of visible light and UV-A radiation on the combined toxicity of P25 TiO2 nanoparticles and polystyrene microplastics on Chlorella sp.

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