Toxicological effects of AgNPs on duckweed (Landoltia punctata).

Autor: Lalau CM; Laboratory of Environmental Toxicology, Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina State, Florianópolis, Santa Catarina CEP: 88040-970, Brazil., Simioni C; Plant Cell Biology Laboratory, Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina State, Florianópolis, Santa Catarina CEP: 88049-900, CP 476, Brazil., Vicentini DS; Laboratory of Environmental Toxicology, Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina State, Florianópolis, Santa Catarina CEP: 88040-970, Brazil., Ouriques LC; Plant Cell Biology Laboratory, Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina State, Florianópolis, Santa Catarina CEP: 88049-900, CP 476, Brazil. Electronic address: luciane.ouriques@ufsc.br., Mohedano RA; Laboratory of Environmental Toxicology, Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina State, Florianópolis, Santa Catarina CEP: 88040-970, Brazil. Electronic address: rodrigo.mohedano@ufsc.br., Puerari RC; Laboratory of Environmental Toxicology, Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina State, Florianópolis, Santa Catarina CEP: 88040-970, Brazil., Matias WG; Laboratory of Environmental Toxicology, Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina State, Florianópolis, Santa Catarina CEP: 88040-970, Brazil. Electronic address: william.g.matias@ufsc.br.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2020 Mar 25; Vol. 710, pp. 136318. Date of Electronic Publication: 2019 Dec 28.
DOI: 10.1016/j.scitotenv.2019.136318
Abstrakt: Silver nanoparticles (AgNPs) are widely applied in several types of products since they act as a biocide. However, their high level of release into the environment can bring risks to ecosystems. Thus, the toxicity of AgNPs toward duckweed (Landoltia punctata) was investigated by monitoring the growth rate inhibition and the effect on the photosynthetic metabolism through morphological and ultrastructural analysis. The AgNPs were characterized by transmission electron microscopy and the effective diameter (dynamic light scattering) and zeta potential were determined. Plants were grown according to the environmental conditions recommended in ISO/DIS 20079 and then exposed to different concentrations of AgNPs. Inhibition of the growth rate was measured based on the EC 50 and changes in the morphology, cellular structures and photosynthetic pigments were evaluated along with the silver accumulation. Although the results showed low growth inhibition when compared to other studies, significant damage to the ultrastructure, decreases in the photosynthetic pigments and starch grains, an increase in the phenolic compounds and physiological changes, such as a loss of color, were observed. Moreover, the accumulation of silver ions was noted and this could lead to bioamplification in consumer organisms, since duckweed belongs to the first level of the food chain.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2019. Published by Elsevier B.V.)
Databáze: MEDLINE
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