期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 662, 期 -, 页码 697-702出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.01.275
关键词
Cadmium; Duckweed; IC50; Nano-ZnO; Physiological parameters
资金
- Zhejiang Provincial Natural Science Foundation [LY19C030003]
- National Natural Science Foundation of China [31670511]
- Shandong Provincial Natural Science Foundation [ZR2018PC003]
Release of nanoparticles into the aquatic environment will inevitably influence the behavior and toxicities of other existing pollutants. In the present study, 10 mg/L of nano-ZnO (diameter 20-30 nm) was used to evaluate its impacts on cadmium(Cd) toxicity on duckweed Lemnaminor based on IC50 values and four biological parameters including percent inhibition of growth rate (I-r), ratio of chlorophyll/pheophytin (D665/D665a), antioxidant enzymes, and H+-ATPase. Results of the 96-h IC50 values of Cd with or without nano-ZnO indicate no additional toxicological effects of nano-ZnO to plants. Further examinations using two Cd concentrations (0.1 and 1 mg/L) showed that nano-ZnO did not influence the inhibitory effect of 0.1 mg/L Cd, but significantly (P < 0.05) reduced the stress of 1 mg/L Cd to the duckweed. The index D665/D665a reflected that the toxic effect of 1 mg/L Cd was significantly (P < 0.05) suppressed by nano-ZnO. H+-ATPase was also sensitive to reveal the protective effects of nano-ZnO on the duckweed under Cd exposure. However, the responses of the antioxidant enzymes SOD and CAT failed to reflect the effects of nano-ZnO on Cd toxicity. Hysteretic addition of nano-ZnO for 24 h showed that the protective effects of nano-ZnO were weakened. Our results suggest that the adsorption of Cd to nano-ZnO may result in lower Cd uptake by L. minor, thus reducing its toxicity. (C) 2019 Published by Elsevier B.V.
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