期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 796, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.148750
关键词
Polystyrene nanoplastics and microplastics; Crop species; Phytotoxicity; Oxidative stress; Uptake
资金
- National Natural Science Foundation of China [21806014]
- Special Projects of Construction of Science and Technology Innovation Ability of Beijing Academy of Agri-culture and Forestry Sciences [KJCX20190405, KJCX20200422]
- Project of Beijing Excellent Talents
The study found that different plant species had varying responses to exposure to nano-PS and micro-PS, with Italian lettuce being the most sensitive crop. Root growth of Italian lettuce and corn was significantly inhibited by polystyrene exposure, while radish and wheat were hardly affected. Antioxidant enzymatic activities, lipid peroxidation, and biomarker indexes confirmed that the toxic effects of nanoplastics on crops are likely due to oxidative stress.
This study investigated the early responses of four common food crops (Italian lettuce, radish, wheat and corn) by exposing their seeds to suspensions of polystyrene nanoparticles (nano-PS) and microspheres (micro-PS). We found that the crop responses to exposure to nano-PS and micro-PS at different doses were dependent on the plant species. Among the four species, Italian lettuce was the most sensitive crop in terms of seed germination and its germination index after polystyrene exposure for 7 days was inhibited by 18.2%-36.0% compared with that of the control (p < 0.05). The root growth (root dry weight, root/shoot ratio and root length) of Italian lettuce and corn was significantly inhibited by the exposure treatment (p < 0.05), whereas that of radish and wheat was hardly affected. Analyses of antioxidant enzymatic activities, lipid peroxidation, and integrated biomarker indexes confirmed that the toxic effects of nano-PS and micro-PS on crops are likely due to oxidative stress. The observed distribution of fluorescent nano-PS in the roots or germs of the tested crops suggests that nanoplastics can be taken up by plants even at a very early growth stage (<7 days after sowing). Future research is needed in order to obtain more insights into their implications for agricultural sustainability and food safety. (c) 2021 Elsevier B.V. All rights reserved.
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