Direct and indirect effects of zinc oxide and titanium dioxide nanoparticles on the decomposition of leaf litter in streams

Riyami, Sumaya Al; Mahrouqi, Dalal Al; Abed, Raeid M. M.; Elshafie, Abdulkadir E.; Sathe, Priyanka; Barry, Michael J.

doi:10.1007/s10646-019-02036-y

Cited by 5 publications

(7 citation statements)

References 61 publications

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“…At the class level, Gammaproteobacteria are enriched in Soil/ZnO/metalaxyl/grass with the highest LDA score (approximately 4.5). This result is consistent with previous reports, in which ZnO increased the relative abundance of Gammaproteobacteria …”

Section: Resultssupporting

confidence: 94%

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Impact of TiO₂ and ZnO Nanoparticles on Soil Bacteria and the Enantioselective Transformation of Racemic-Metalaxyl in Agricultural Soil with Lolium perenne: A Wild Greenhouse Cultivation

Zhou

Zhang

Wu³

2020

J. Agric. Food Chem.

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The effects of TiO2 and ZnO nanoparticles on soil bacteria and enantioselective transformation of racemic-metalaxyl (rac-metalaxyl) in agricultural soil with or without Lolium perenne were investigated in an outdoor greenhouse. After a 70-day exposure to 2‰ ZnO, microbial biomass carbon decreased by 66% and bacterial community composition significantly changed. Meanwhile, ZnO decreased chlorophyll cumulation in L. perenne by 34%. ZnO also inhibited the enantioselective transformation of metalaxyl enantiomers and changed the enantiomer fraction of metalaxyl. TiO2 showed similar effects but to a lesser extent. L. perenne promoted the transformation of rac-metalaxyl and ingested TiO2 and ZnO. L. perenne changed the bacterial co-occurrence networks and biomarkers in native soil and soil exposed to TiO2 and ZnO. L. perenne reduced the inhibition effects of TiO2 and ZnO on the transformation of rac-metalaxyl. The decrease in the relative abundance of soil keystone taxa such as Acidobacteria and Gemmatimonas might respond to the corresponding slow transformation of rac-metalaxyl in soils exposed to TiO2 and ZnO, regardless of L. perenne. Our results demonstrated the existence of mutual interactions among the impact of engineered nanoparticles on different components (microbes, plants, and coexisting pollutants) in the terrestrial ecosystem.

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Section: Resultssupporting

confidence: 94%

“…This result is consistent with previous reports, in which ZnO increased the relative abundance of Gammaproteobacteria. 43 3.5. Uptake of TiO 2 and ZnO in L. perenne and Their Effects on Chlorophyll Concentration.…”

Section: Effects Of Tio 2 or Zno On Soil Bacterialmentioning

confidence: 99%

Impact of TiO₂ and ZnO Nanoparticles on Soil Bacteria and the Enantioselective Transformation of Racemic-Metalaxyl in Agricultural Soil with Lolium perenne: A Wild Greenhouse Cultivation

Zhou

Zhang

Wu³

2020

J. Agric. Food Chem.

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“…85 nm) likely contributes to the discrepancy between studies. Two additional studies targeted the impact of nTiO 2 on leaf decomposition in freshwater systems: the microbial decomposition of Populus nigra and Ficus vasta was reduced by up to 30%, which could be linked to changes in the leaf-associated microbial community, respiration, and enzymatic activity (Al Riyami et al 2019;Du et al 2018). In contrast to the present study, the concentrations used by these authors were up to two orders of magnitude (up to 500 mg/L) above those applied here.…”

Section: Microbial Leaf Litter Decompositionmentioning

confidence: 53%

“…While the impact of nTiO 2 alone on leaf litter decomposition is documented elsewhere (Du et al 2018;Jain et al 2019), only one study assessed the combined effect of nTiO 2 and natural sunlight with unknown UV intensity. In this study, Al Riyami et al (2019) observed that sunlight mitigates the impact of nTiO 2 observed in darkness on microbial leaf mass loss, which the authors related to the release of ROS degrading structural polysaccharides in the leaves. Besides leaf decomposition, leaf-associated heterotrophic biofilmsin particular bacteria and fungiincrease leaves' palatability and nutritional value for leaf-shredding macroinvertebrates (Bärlocher 1985).…”

Section: Introductionmentioning

confidence: 73%

Photoactive titanium dioxide nanoparticles modify heterotrophic microbial functioning

Bundschuh

Zubrod

Konschak

et al. 2021

Environ Sci Pollut Res

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Nanoparticulate titanium dioxide (nTiO2) is frequently applied, raising concerns about potential side effects on the environment. While various studies have assessed structural effects in aquatic model ecosystems, its impact on ecosystem functions provided by microbial communities (biofilms) is not well understood. This is all the more the case when considering additional stressors, such as UV irradiation — a factor known to amplify nTiO2-induced toxicity. Using pairwise comparisons, we assessed the impact of UV (UV-A = 1.6 W/m2; UV-B = 0.7 W/m2) at 0, 20 or 2000 μg nTiO2/L on two ecosystem functions provided by leaf-associated biofilms: while leaf litter conditioning, important for detritivorous invertebrate nutrition, seems unaffected, microbial leaf decomposition was stimulated (up to 25%) by UV, with effect sizes being higher in the presence of nTiO2. Although stoichiometric and microbial analyses did not allow for uncovering the underlying mechanism, it seems plausible that the combination of a shift in biofilm community composition and activity together with photodegradation as well as the formation of reactive oxygen species triggered changes in leaf litter decomposition. The present study implies that the multiple functions a microbial community performs are not equally sensitive. Consequently, relying on one of the many functions realized by the same microbial community may be misleading for environmental management.

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“…Metallic nanoparticles may also impact the decomposition process. Previous studies show that both nano-Ti (nT) and nano-Zn (nZ) reduced the rate of leaf decomposition and that the effects of nano-Ti were strongest in the dark (Al Riyami et al, 2019). Similarly, nano-Zn decreased the activity of soil bacterial communities (Rashid et al 2017), while low concentrations of nZ (< 300 µg/L) initially promoted but later suppressed fungal biomass during leaf decomposition (Du et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Interactive Effects of Zinc and Titanium Nanoparticles of Leaf Decomposition in Freshwater Ecosystems

Jabri

Abed

Elshafie

et al. 2023

Preprint

Self Cite

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In conclusion, we observed that titanium nanoparticles inhibited leaf decomposition more strongly than zinc nanoparticles, and that the combination treatments reduced the effects of the titanium. This was opposite to what we initially expected. The nano-titanium reduced bacterial growth, suggesting that this may be one mechanism that could inhibit decomposition. Light may play a role in generation of reactive oxygen species that increase toxicity of the nanoparticles, but effects are complex. Overall, this study highlights the importance of testing the effects of mixtures that are likely to occur in the environment. Metallic nanoparticles are an emerging hazard that will continue to grow as their use expands in the future. Zinc and titanium nanoparticles are used in many consumer and industrial products. Consequently, they are increasingly being detected in the sediments of aquatic ecosystems. Despite their frequent co-occurrence, there is little information on how they interact, although previous studies on cells suggest that nano-titanium may inhibit nano-zinc toxicity by reducing Zn2+ bioavailability. Leaf decomposition is a major source of allochthanous energy in freshwater ecosystems. In this study we measured the effects of zinc and titanium nanoparticles, alone or in combination, on the rate of leaf decomposition. In Experiment 1, leaf discs, produced from senescent leaves of Ficus sycomorus were exposed to either 1, 10 or 100 mg/L of either ZnO or TiO2 nanoparticles, alone or in combination, for six weeks. Mass loss and microbial metabolism were measured at fortnightly intervals and bacterial community composition measured after six weeks using next generation Illumina MiSeq sequencing. In Experiment 2, F. sycomorus leaf discs were exposed for two weeks to10 mg/L ZnO or TiO2 nanoparticles, alone or in combination, both in the light or dark, and in presence or absence of chloramphenicol, a broad spectrum antibacterial, giving a total of 16 treatments. Mass loss, bacterial colony formation, and the C:N ratio of leaf tissue were measured. In experiment 1 there was no evidence that titanium nanoparticles reduced the concentration of Zn2+. After six weeks, there was significantly less mass loss in all titanium nanoparticle treatments, compared with controls, zinc nanoparticles alone, or the combination treatments. Microbial metabolism was initially low, but increased after four weeks, but there were no clear effects of the nanoparticles on oxygen consumption by the microbes. After six weeks, the bacterial communities of leaves treated with 10 and 100 mg/L of the combination treatment and the 100 mg/L zinc nanoparticle treatments, showed a clear separation from other treatments int terms of community composition. The dominant species in the three communities was Bacillus subtillus. In experiment 2, there was greater mass loss in the dark and lower mass loss in treatments containing chloramphenicol. Both nano-titanium and chloramphenicol inhibited bacterial growth, but there were complex three-way interactions between all three factors. The C:N ratio was lowest in controls and highest in the leaves exposed to nano-titanium. There was also an interaction between light and nanoparticle treatment.

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Direct and indirect effects of zinc oxide and titanium dioxide nanoparticles on the decomposition of leaf litter in streams

Cited by 5 publications

References 61 publications

Impact of TiO₂ and ZnO Nanoparticles on Soil Bacteria and the Enantioselective Transformation of Racemic-Metalaxyl in Agricultural Soil with Lolium perenne: A Wild Greenhouse Cultivation

Impact of TiO₂ and ZnO Nanoparticles on Soil Bacteria and the Enantioselective Transformation of Racemic-Metalaxyl in Agricultural Soil with Lolium perenne: A Wild Greenhouse Cultivation

Photoactive titanium dioxide nanoparticles modify heterotrophic microbial functioning

Interactive Effects of Zinc and Titanium Nanoparticles of Leaf Decomposition in Freshwater Ecosystems

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Direct and indirect effects of zinc oxide and titanium dioxide nanoparticles on the decomposition of leaf litter in streams

Cited by 5 publications

References 61 publications

Impact of TiO2 and ZnO Nanoparticles on Soil Bacteria and the Enantioselective Transformation of Racemic-Metalaxyl in Agricultural Soil with Lolium perenne: A Wild Greenhouse Cultivation

Impact of TiO2 and ZnO Nanoparticles on Soil Bacteria and the Enantioselective Transformation of Racemic-Metalaxyl in Agricultural Soil with Lolium perenne: A Wild Greenhouse Cultivation

Photoactive titanium dioxide nanoparticles modify heterotrophic microbial functioning

Interactive Effects of Zinc and Titanium Nanoparticles of Leaf Decomposition in Freshwater Ecosystems

Contact Info

Product

Resources

About

Impact of TiO₂ and ZnO Nanoparticles on Soil Bacteria and the Enantioselective Transformation of Racemic-Metalaxyl in Agricultural Soil with Lolium perenne: A Wild Greenhouse Cultivation

Impact of TiO₂ and ZnO Nanoparticles on Soil Bacteria and the Enantioselective Transformation of Racemic-Metalaxyl in Agricultural Soil with Lolium perenne: A Wild Greenhouse Cultivation