Toxicological effects of AgNPs on duckweed (Landoltia punctata)

Lalau, Cristina Moreira; Simioni, Carmen; Vicentini, Denice Schulz; Ouriques, Luciane Cristina; Mohedano, Rodrigo A.; Puerari, Rodrigo Costa

doi:10.1016/j.scitotenv.2019.136318

Cited by 37 publications

(20 citation statements)

References 47 publications

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“…Silver nanoparticle-inhibited growth also stimulated the accumulation of starch in a local clone of La. punctata from Brazil, but the authors evaluated only stained cross sections of fronds (Lalau et al 2020).…”

Section: The Effects Of Heavy Metalsmentioning

confidence: 99%

Accumulation of starch in duckweeds (Lemnaceae), potential energy plants

Appenroth¹,

Ziegler

Sree

2021

Physiol Mol Biol Plants

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Starch can accumulate in both actively growing vegetative fronds and over-wintering propagules, or turions of duckweeds, small floating aquatic plants belonging to the family of the Lemnaceae. The starch synthesizing potential of 36 duckweed species varies enormously, and the starch contents actually occurring in the duckweed tissues are determined by growth conditions, various types of stress and the action of growth regulators. The present review examines the effects of phytohormones and growth retardants, heavy metals, nutrient deficiency and salinity on the accumulation of starch in duckweeds with a view to obtaining high yields of starch as a feedstock for biofuel production. Biotechnological approaches to degrading duckweed starch to its component sugars and the fermentation of these sugars to bio-alcohols are also discussed.

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Section: The Effects Of Heavy Metalsmentioning

confidence: 99%

Accumulation of starch in duckweeds (Lemnaceae), potential energy plants

Appenroth¹,

Ziegler

Sree

2021

Physiol Mol Biol Plants

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“…Glyphosate (96%) was purchased from Sigma‐Aldrich. The methodology described by Lalau et al (2020) was used to prepare 100 mL of the AgNP suspension, with minor modifications in the amounts of reagents utilized. The procedure involved the chemical reduction of silver nitrate (AgNO 3 ) with sodium borohydride (NaBH 4 ; Sigma‐Aldrich) in the presence of stabilizing agent polyvinyl alcohol (Neon).…”

Section: Methodsmentioning

confidence: 99%

Multigenerational Toxic Effects on Daphnia magna Induced by Silver Nanoparticles and Glyphosate Mixture

Silva

Nogueira

Köerich

et al. 2021

Enviro Toxic and Chemistry

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Multigenerational toxicological effects of a binary mixture of silver nanoparticles (AgNPs) with glyphosate were identified in Daphnia magna using acute and chronic toxicity tests. Acute toxicity interactions were analyzed with the Abbott method. In the chronic tests, the survival, growth, reproduction, and age at first brood were evaluated for the parents and the exposed (F1E) and non-exposed (F1NE) descendants. The scales tested for binary mixture, at the acute level, presented antagonistic and additive interactions, possibly associated with the complexation of the AgNPs by glyphosate. Multigenerational chronic effects related to the parameters, reproduction, and age at first brood were observed in the descendants tested with the individual compounds, with no recovery for F1E and F1NE. In organisms exposed to binary mixture, there was a delay in the age at first brood and also a significant change in the reproduction parameter, with a strong reduction for the parents, F1E, and F1NE, indicating a higher toxicity than the compounds tested individually. Although the results for acute interactions between AgNP and glyphosate did not provide clear evidence, multigenerational chronic binary mixture trials have resulted in unexpected toxicity compared with individual treatments, increasing the concerns associated with this co-exposure in other scenarios. Therefore, the interaction of binary mixture with the organisms merits further investigation and the results reported in the present study will be useful in this regard.

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“…Effects on growth reflect changes in the biochemical metabolism of the plant (Lalau et al, 2020). Since chlorophyll content is a significant biomarker that reflects the status of plant growth, the results may indicate AgNP effects on the photosynthetic metabolism.…”

Section: Chlorophylls and Total Carotenoids Contentmentioning

confidence: 99%

Phyto-Synthesized Silver Nanoparticle Toxicity Effect on Aquatic Plant Lemna minor L.

KOÇER¹,

Ayisigi²,

HASEKİ³

et al. 2021

European Journal of Science and Technology

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Silver nanoparticles (AgNPs) are made up about 55% of all nanomaterials produced and are widely used in consumer products. Its is inevitable that these particles are released to the aquatic environment during production, use and disposal. In this study, subacute toxicity of AgNPs obtained by phyto-synthesis was investigated on Lemna minor L. (duckweed) plants. The formation of AgNPs obtained from laurel (Laurus nobilis L.) extract was determined by UV-VIS spectrophotometric measurements. The AgNPs synthesized by the phytosynthesis method were characterized by Fourier transform infrared spectroscopy (FT-IR), Zeta size and potential, Inductively Coupled Plasma Mass Spectrometry and Scanning electron microscopy (SEM-EDS) analysis. The analysis results show that AgNPs are homogeneously distributed, spherical in shape with an average size of 34 nm and coated with phyto-content. For toxicity tests, plant stock cultures were grown in the climate room according to OECD 221 guidelines. After 8 weeks of acclimation, the plants were treated with AgNP concentrations ranging from 0.005 to 50 mg L −1 for 7-and 14-days. The increase in AgNP concentration caused a decrease in frond numbers. Growth inhibition data showed that the EC50 value of phyto-synthesized AgNP was 4.78 mg L -1 and the lowest observed effect concentration (LOEC) was 0.5 mg L -1 for 7-days. AgNP concentrations below LOEC level (0.05, to 0.5 mg L -1 ) caused a significant decrease in growth rate by 20.07% after 7 days of exposure while it was found 4.03% for 14-days treatment at the highest AgNP concentration (0.5 mg L -1 ). Similar trend was observed in fresh-and dry weight of plants indicating prolonged exposure time triggering tolerance mechanism which was corroborated by chlorophyll a/b and carotenoids content results. Based on higher NOEC, LOEC and EC50 values, phyto-synthesized AgNP usage may lead less environmental toxicity.

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Toxicological effects of AgNPs on duckweed (Landoltia punctata)

Cited by 37 publications

References 47 publications

Accumulation of starch in duckweeds (Lemnaceae), potential energy plants

Accumulation of starch in duckweeds (Lemnaceae), potential energy plants

Multigenerational Toxic Effects on Daphnia magna Induced by Silver Nanoparticles and Glyphosate Mixture

Phyto-Synthesized Silver Nanoparticle Toxicity Effect on Aquatic Plant Lemna minor L.

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