Size-dependent cellular internalization and effects of polystyrene microplastics in microalgae P. helgolandica var. tsingtaoensis and S. quadricauda

Chen, Yingxin; Ling, Yun; Li, Xinyu; Hu, Jiani; Cao, Chengjin; He, Defu

doi:10.1016/j.jhazmat.2020.123092

Cited by 111 publications

(21 citation statements)

References 65 publications

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“…The size of microplastics is also a very relevant interference factor in the process of internalization by cells. Microspheres of 1 and 2 lm of PS were found in the algae cells, while in the same study microplastics with sizes between 3 and 5 lm were not detected inside S. quadricauda cells (Chen et al 2020b). Considering that the microplastics currently in the environment are undergoing a constant process of fragmentation and that the cellular internalization in microalgae can facilitate the transfer of these fragments to the food chain, it is concluded that studies in greater depth need to be carried out urgently to detail and elucidate the events involved in these processes.…”

Section: Photosynthetic Activitymentioning

confidence: 56%

“…The response of algae to exposure to contaminants was quite variable, as there were no significant changes in photosynthetic efficiency in some studies (Chen et al 2020b;Lin et al 2020;Sjollema et al 2016), whereas Li et al and Yang et al (2020) observed inhibition in photosynthesis regardless of concentration and time of exposure. Finally, the impairment was evidenced significantly (Mao et al 2018;Wu et al 2019), including a decrease in the expression of genes involved in the photosynthetic process (Lagarde et al 2016).…”

Section: Photosynthetic Activitymentioning

confidence: 99%

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Microplastics and freshwater microalgae: what do we know so far?

2021

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The constant entry of microplastics in several environmental matrices has been of great concern to the scientific community and to society in general, mainly due to the mysteries that surround the implications of this pollutant in the environment. Freshwater ecosystems are resources especially susceptible to variations in environmental quality, and the lack of data on the impacts caused by plastic fragments exacerbates the vulnerability of this environment. Considering the results of other studies, which demonstrate the increasing entry of polymeric fragments in the aquatic environment can lead to algae growth inhibition, an investigation was carried out to determine the current state of research on the interaction between microplastics and freshwater microalgae. In total, 20 scientific articles were analyzed. Different species were subjected to toxicological tests under controlled conditions in the laboratory with small microplastics (size range between 0.1 and 1000 lm), primary and secondary microplastics of different types of polymer. Four toxicity class of indicators were chosen to assess the microalgae response to exposure to microplastic in the selected studies: growth inhibition; photosynthetic activity; pigment analysis; and enzymatic activity and oxidative stress. In this review, a critical analysis is made on the effects of the shape, size, concentration, and duration of exposure to microplastics and research gaps are identified to guide future research priorities in this area of study.

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Section: Photosynthetic Activitymentioning

confidence: 56%

Section: Photosynthetic Activitymentioning

confidence: 99%

Microplastics and freshwater microalgae: what do we know so far?

2021

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“…inclusions of MPs in algae cells were found. 6,7 Within the collected APP samples from seawater, the occurrence of micronized rubber powder (MRP), often referred to as tyre wear particles, has also been reported. 8 MRP is an umbrella name for the abrasion of thermoset polymers.…”

Section: Water Impactmentioning

confidence: 99%

Filter-less separation technique for micronized anthropogenic polymers from artificial seawater

Grob

Zeneli

Ott

et al. 2021

Environ. Sci.: Water Res. Technol.

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“…The occurrence of engulfment of MP (1.0 to 2.0 µm) in microalgal cells of both marine Platymonas helgolandica var. tsingtaoensis and freshwater microalgae Scenedesmus quadricauda resulted in a significant reduction in the density of microalgae [14]. Microplastic beads can wrap around the surface of microalgae Chlamydomonas reinhardtii and damage their membranes, thus affecting their growth and photosynthetic efficiency [15].…”

Section: Introductionmentioning

confidence: 99%

Effects of Polystyrene Microplastics on Growth and Toxin Production of Alexandrium pacificum

Liu

Qiu

Tang

et al. 2021

Toxins

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Microplastics (MP) widely distributed in aquatic environments have adverse effects on aquatic organisms. Currently, the impact of MP on toxigenic red tide microalgae is poorly understood. In this study, the strain of Alexandriumpacificum ATHK, typically producing paralytic shellfish toxins (PST), was selected as the target. Effects of 1 and 0.1 μm polystyrene MP with three concentration gradients (5 mg L−1, 25 mg L−1 and 100 mg L−1) on the growth, chlorophyll a (Chl a), photosynthetic activity (Fv/Fm) and PST production of ATHK were explored. Results showed that the high concentration (100 mg L−1) of 1 μm and 0.1 μm MP significantly inhibited the growth of ATHK, and the inhibition depended on the size and concentration of MP. Contents of Chl a showed an increase with various degrees after MP exposure in all cases. The photosynthesis indicator Fv/Fm of ATHK was significantly inhibited in the first 11 days, then gradually returned to the level of control group at day 13, and finally was gradually inhibited in the 1 μm MP treatments, and promotion or inhibition to some degree also occurred at different periods after exposure to 0.1 μm MP. Overall, both particle sizes of MP at 5 and 25 mg L−1 had no significant effect on cell toxin quota, and the high concentration 100 mg L−1 significantly promoted the PST biosynthesis on the day 7, 11 and 15. No significant difference occurred in the cell toxin quota and the total toxin content in all treatments at the end of the experiment (day 21). All MP treatments did not change the toxin profiles of ATHK, nor did the relative molar percentage of main PST components. The growth of ATHK, Chl a content, Fv/Fm and toxin production were not affected by MP shading. This is the first report on the effects of MP on the PST-producing microalgae, which will improve the understanding of the adverse impact of MP on the growth and toxin production of A. pacificum.

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Size-dependent cellular internalization and effects of polystyrene microplastics in microalgae P. helgolandica var. tsingtaoensis and S. quadricauda

Cited by 111 publications

References 65 publications

Microplastics and freshwater microalgae: what do we know so far?

Microplastics and freshwater microalgae: what do we know so far?

Filter-less separation technique for micronized anthropogenic polymers from artificial seawater

Effects of Polystyrene Microplastics on Growth and Toxin Production of Alexandrium pacificum

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