NOM mitigates the phytotoxicity of AgNPs by regulating rice physiology, root cell wall components and root morphology

Huang, Xitong; Li, Yong; Chen, Ke; Chen, Haiyan; Wang, Fei; Han, Xiaomin; Zhou, Beihai; Chen, Huilun; Yuan, Rongfang

doi:10.1016/j.envpol.2020.113942

Cited by 16 publications

(9 citation statements)

References 57 publications

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“…In general, lower concentrations of AgNPs increase seed germination, photosynthesis, and overall growth. In contrast, at higher concentrations, the growth and development are impaired in different species [40–46].…”

Section: Discussionmentioning

confidence: 99%

Biosynthesis of silver nanoparticles using actinomycetes, phytotoxicity on rice seeds, and potential application in the biocontrol of phytopathogens

et al. 2022

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To find effective silver nanoparticles (AgNPs) for control of phytopathogens, in this study, two strains of actinomycetes isolated from the soil of the Brazilian biome Caatinga (Caat5–35) and from mangrove sediment (Canv1–58) were utilized. The strains were identified by using the 16S rRNA gene sequencing as Streptomyces sp., related to Streptomyces mimosus species. The obtained AgNPs were coded as AgNPs 35 and AgNPs58 and characterized by size and morphology using dynamic light scattering, zeta potential, transmission electron microscopy, and Fourier transformed infrared (FTIR). The antifungal activity of the AgNPs35 and AgNPs58 was evaluated in vitro by the minimal inhibitory concentration (MIC) assay on the phytopathogens, Alternaria solani, Alternaria alternata, and Colletotrichum gloeosporioides. The phytotoxic effect was evaluated by the germination rate and seedling growth of rice (Oryza sativa). AgNPs35 and AgNPs58 showed surface plasmon resonance and average sizes of 30 and 60 nm, respectively. Both AgNPs presented spherical shape and the FTIR analysis confirmed the presence of functional groups such as free amines and hydroxyls of biomolecules bounded to the external layer of the nanoparticles. Both AgNPs inhibited the growth of the three phytopathogens tested, and A. alternate was the most sensible (MIC ≤ 4 µM). Moreover, the AgNPs35 and AgNPs58 did not induce phytotoxic effects on the germination and development of rice seedlings. In conclusion, these AgNPs are promising candidates to biocontrol of these phytopathogens without endangering rice plants.

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Section: Discussionmentioning

confidence: 99%

Biosynthesis of silver nanoparticles using actinomycetes, phytotoxicity on rice seeds, and potential application in the biocontrol of phytopathogens

et al. 2022

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“…To express the measured concentration correctly, the diluted concentration was multiplied 10 times. Therefore, using two types of ultra-4-centrifugal filters, 3 and 30 kDa, we could determine whether aqueous complexes were formed [47,48].…”

Section: Analysis Of Ionic Effectmentioning

confidence: 99%

Influence of NOM on the Stability of Zinc Oxide Nanoparticles in Ecotoxicity Tests

et al. 2020

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Nanomaterials are known to aggregate in the presence of ions. Similarly, the aggregation of zinc oxide nanoparticles (ZnO NPs) exposed to various ions such as sodium chloride and calcium chloride in water systems increases with the ionic strength. Therefore, for accurate toxicity studies, it is necessary to conduct a test using natural organic matters (NOMs) as additional dispersants that strengthen stability with increased repulsive forces. The three types of ecotoxicity tests based on the dispersion stability test using NOM showed that the toxicities of the three test samples decreased in the presence of NOM. To determine how NOM improved dispersion and reduced toxicities, we analyzed the ionization degree of ZnO NPs with and without NOM and found that the solubility was below 2 mg/L with a negligible change over time, implying that the ionization effect was low. The absolute value of the surface charge of particles increased in the presence of NOM, resulting in increased repulsive electrostatic forces and steric hindrance, causing less aggregation and more dispersion. Additionally, although the NOM used in the test is considered an effective dispersant that does not have a toxicological effect on aquatic organisms, the presence of NOM resulted in reduced toxicities and should be further investigated to establish it as a standard test method.

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“…The EPS-Ag-NPs and EPS-Ag 2 S-NPs complexes were also therefore negatively charged, and not easily be accessed to the negatively charged root cell membrane surfaces of plant due to electrostatic repulsion (Wang et al, 2018). The formation EPS-nanoparticles complexes will thus reduce the bioavailability of nanoparticles (Ding et al, 2019), which also support the alleviated phytotoxicity of Ag-NPs in this study (Gao et al, 2012;Huang et al, 2020).…”

Section: Interaction Mechanism Between Ag and Epsmentioning

confidence: 52%

“…The variation tendency of H 2 O 2 contents was generally consistent with that for MDA content. Similarly, it was also reported that NOM could mitigates the seed germination and root elongation of rice stressed by AgNO 3 /Ag-NPs (Huang et al, 2020). These findings suggest that B. subtilis EPS could alleviate the toxicity of AgNO 3 and Ag-NPs, but aggravate the toxicity of Ag 2 S-NPs.…”

Section: Ag Bioaccumulation and Phytotoxicity To Wheat Affected By Epsmentioning

confidence: 60%

Effects of extracellular polymeric substances on silver nanoparticle bioaccumulation and toxicity to Triticum aestivum L.

Zhong

Qing

et al. 2021

Chemosphere

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NOM mitigates the phytotoxicity of AgNPs by regulating rice physiology, root cell wall components and root morphology

Cited by 16 publications

References 57 publications

Biosynthesis of silver nanoparticles using actinomycetes, phytotoxicity on rice seeds, and potential application in the biocontrol of phytopathogens

Biosynthesis of silver nanoparticles using actinomycetes, phytotoxicity on rice seeds, and potential application in the biocontrol of phytopathogens

Influence of NOM on the Stability of Zinc Oxide Nanoparticles in Ecotoxicity Tests

Effects of extracellular polymeric substances on silver nanoparticle bioaccumulation and toxicity to Triticum aestivum L.

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