微塑料和硼过量对铜绿微囊藻的联合效应。
Combined effects of microplastics and excess boron on Microcystis aeruginosa.
机构信息
Tianjin Key Laboratory of Animal and Plant Resistance, College of Life Sciences, Tianjin Normal University, Tianjin 300387, China.
Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
出版信息
Sci Total Environ. 2023 Sep 15;891:164298. doi: 10.1016/j.scitotenv.2023.164298. Epub 2023 May 24.
Both microplastics (MPs) and excess boron (B) have adverse effects on microalgae. However, the combined toxic effects of MPs and excess B on microalgae have not been studied. The aim of this study was to investigate the combined effects of excess B and three types of surface-modified microplastics, including plain polystyrene (PS-Plain), amino-modified polystyrene (PS-NH), and carboxyl-modified polystyrene (PS-COOH), on chlorophyll a content, oxidative damage, photosynthetic activity and microcystin (MC) production in Microcystis aeruginosa. The results showed that PS-NH inhibited the growth of M. aeruginosa, with the maximum inhibition rate of 18.84 %, while PS-COOH and PS-Plain showed stimulatory effects with the maximum inhibition rates of -2.56 % and - 8.03 % respectively. PS-NH aggravated the inhibition effects of B, while PS-COOH and PS-Plain alleviated the inhibition effects. Furthermore, the combined exposure of PS-NH and excess B had a much greater effect on oxidative damage, cell structure, and production of MCs in algal cells than the combined effects of PS-COOH and PS-Plain. The charges on microplastics affected both B adsorption on microplastics and the aggregation of microplastics with algal cells, indicating that the charge on microplastics is a dominant factor influencing the combined effects of microplastics and excess B on microalgae. Our findings can provide direct evidence for the combined effects of microplastics and B on freshwater algae and improve the understanding of the potential risks of microplastics in aquatic ecosystems.
微塑料（MPs）和过量硼（B）都对微藻有不良影响。然而，MPs 和过量 B 对微藻的联合毒性作用尚未得到研究。本研究旨在研究过量 B 和三种表面改性微塑料（包括普通聚苯乙烯（PS-Plain）、氨基改性聚苯乙烯（PS-NH）和羧基改性聚苯乙烯（PS-COOH））对铜绿微囊藻叶绿素 a 含量、氧化损伤、光合作用和微囊藻毒素（MC）产生的联合影响。结果表明，PS-NH 抑制了铜绿微囊藻的生长，最大抑制率为 18.84%，而 PS-COOH 和 PS-Plain 则表现出刺激作用，最大抑制率分别为-2.56%和-8.03%。PS-NH 加剧了 B 的抑制作用，而 PS-COOH 和 PS-Plain 则减轻了 B 的抑制作用。此外，PS-NH 和过量 B 的联合暴露对藻类细胞的氧化损伤、细胞结构和 MC 产生的影响比 PS-COOH 和 PS-Plain 的联合暴露大得多。微塑料上的电荷既影响 B 在微塑料上的吸附，又影响微塑料与藻类细胞的聚集，表明微塑料上的电荷是影响微塑料和过量 B 对微藻联合作用的主导因素。我们的研究结果可为微塑料和 B 对淡水藻类的联合作用提供直接证据，并提高对水生生态系统中微塑料潜在风险的认识。
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