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• W2995909256 endingPage "109925" @default.
• W2995909256 startingPage "109925" @default.
• W2995909256 abstract "Information on silver nanoparticle (AgNP) phytotoxicity on seagrasses is provided for the first time. Toxic effects of environmentally relevant AgNP concentrations on Halophila stipulacea were assessed to identify sensitive biomarkers, to determine threshold effect concentrations and to evaluate potential risks. Potential alterations in the cytoskeleton, endoplasmic reticulum, cell ultrastructure and viability, oxidative stress parameters and elongation in H. stipulacea leaves exposed to AgNP concentrations ranging from 0.0002 to 0.2 mg L-1 for 8 days were examined. The first signs of actin filament (AF) response in differentiating cells, exhibiting disorientation and slight bundling, were observed on the 4th day at 0.0002 mg L-1, while at the end of the experiment and at the higher concentrations, AFs were extremely bundled. Endoplasmic reticulum was affected in meristematic and differentiating cells; massive aggregations and loss of the grainy structure were observed, initially on the 6th day at 0.002 mg L-1. Effects on microtubules were detected on the last day at 0.2 mg L-1. An increase in H2O2 levels on the 4th and/or 6th day even at 0.0002 mg L-1 was followed by a decrease on, or up to the last day. On the 6th day at the lowest concentration, elevated malondialdehyde content, and superoxide dismutase and peroxidase activity were detected, indicating oxidative damage and antioxidant defense mechanism activation. Dead epidermal cells mainly occurred at 0.02 and 0.2 mg L-1, while no dead vein cells were detected. A significant inhibition in leaf elongation was observed only at 0.2 mg L-1. Therefore, AF disturbance in differentiating leaf cells, being a susceptible response parameter, could be regarded as an early warning indicator of risk posed by AgNPs to H. stipulacea meadows, while most of the remaining parameters examined also constitute useful biomarkers. The lowest observed effect concentration (0.0002 mg L-1), being within the range of environmentally relevant AgNPs concentrations, suggests the possibility of negative impacts of AgNPs on seagrass health. A risk quotient of 1.33 was calculated, indicating that AgNPs may pose a significant potential risk to the coastal environment. The data presented highlight the importance of future research to further investigate the seagrass-AgNP interactions, stress the need for a refinement of the environmental risk assessment of AgNPs and could be utilized for the design of biomonitoring programs for rational management of the coastal environment." @default.
• W2995909256 created "2019-12-26" @default.
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• W2995909256 date "2020-02-01" @default.
• W2995909256 modified "2023-10-18" @default.
• W2995909256 title "Silver nanoparticle toxicity effect on the seagrass Halophila stipulacea" @default.
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• W2995909256 doi "https://doi.org/10.1016/j.ecoenv.2019.109925" @default.
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