期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 642, 期 -, 页码 1378-1385出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2018.06.141
关键词
Nanoplastics; Microplastics; Marine bacterium; ROS generation; Extracellular polymeric
资金
- NSFC - Shandong Joint Fund for Marine Ecology and Environmental Sciences [U1406404]
- Creative Team Project of the Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology [LMEES-CTSP-2018-4]
- Special Scientific Research Funds for Central Non-profit Institutes, Yellow Sea Fisheries Research Institutes [20603022016015, 20603022018011]
- National Natural Science Foundation of China [41206100, 31170113, 41706130]
- Scientific and Technological Innovation Project - Qingdao National Laboratory for Marine Science and Technology [2016ASKJ14]
Nano- and microplastics have been shown to cause negative effects on marine organisms. However, the toxicities of nano- and microplastics toward marine bacteria are poorly understood. In this study, we investigated the toxic effects of polystyrene nano- and microplastics on the marine bacterium Halomonas alkaliphila by determining growth inhibition, chemical composition, inorganic nitrogen conversion efficiencies and reactive oxygen species (ROS) generation. The results showed that both nano- and microplastics inhibited the growth of H. alkaliphila in high concentrations, while nanoplastics rather than microplastics influenced the growth inhibition, chemical composition and ammonia conversion efficiencies of H. alkaliphila at concentration of 80 mg/L.The ROS generation indicated oxidative stress induced by nano- but not microplastics, and the oxidative stress induced by nanoplastics may provide a significant effect on bacteria. Furthermore, the positively charged nanoplastics (amine-modified 50 nm) induced higher oxidative stress toward bacteria than that induced by negatively charged nanoplastics (non-modified 55 nm). The increased extracellular polymeric substances as evidenced by transmission electron microscope (TEM) observation suggested the possible bacterial protective mechanisms. The present study illustrates for the first time the impact of plastics debris on the inorganic nitrogen conversion efficiencies of marine bacteria. Our findings highlight the effects of microplastics on the ecological function of marine organisms. (C) 2018 Elsevier B.V. All rights reserved.
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