Silica uptake from nanoparticles and silica condensation state in different tissues of Phragmites australis

Schaller, Jörg; Brackhage, Carsten; Paasch, Silvia; Brunner, Eike; Bäucker, Ernst; Dudel, E. Gert

doi:10.1016/j.scitotenv.2012.10.016

Cited by 67 publications

(48 citation statements)

References 35 publications

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“…Mucilage and exudates of plants or microorganisms acidify the environment of the rhizosphere Schaller et al, 2013), which promotes dissolution of NPs (Lv et al, 2015;Ma et al, 2011;Parsons et al, 2010;Vannini et al, 2014;Zhang et al, 2012b), even some that are normally insoluble (Battke et al, 2008;Schwabe et al, 2015;Zhang et al, 2012b). Nano-Au, for example, seems to dissolve in the rhizosphere, although it is unclear which exudates would be enough aggressive to protonate and oxidize gold (Taylor et al, 2014).…”

Section: Mucilage and Exudatesmentioning

confidence: 99%

“…The aquaporin channel diameter at the midpoint is 0.2-0.25 nm (Tyerman et al, 2002), and single Hg 2+ ions can block them (Sattelmacher & Horst, 2007). Uptake of insoluble NPs of 41 nm in diameter through these water channels (and similar protein pumps or channels in the cell membrane) is extremely unlikely (Hu et al, 2010;Schaller et al, 2013;Wang et al, 2011a). Indeed, no research found any protein channel including aquaporins to be the main pathway for insoluble NP uptake.…”

Section: Non-endocytic Pathwaysmentioning

confidence: 99%

“…All these agents are prone to form electron dense precipitates of shapes and sizes similar to the investigated NPs. Finally, the investigated NPs can dissolve (Badireddy et al, 2014) and re-precipitate in the plant Parsons et al, 2010;Schaller et al, 2013;Vannini et al, 2014;Zhang et al, 2012b). Chemical confirmation by micro-or preferably nanoanalytical techniques can identify the NPs, e.g.…”

Section: Cell-level Imaging Of Nanoparticle Interactionsmentioning

confidence: 99%

“…Indeed, accumulation of insoluble NPs near hydathodes was found in cucumbers, where radioactive 141 Ce, from largely insoluble nano-141 CeO 2 , was detected in leaf tips and serrations at the end of the vascular bundle . Similarly, nano-SiO 2 accumulated in ionic form, and was excreted as a salt near the tips of the leaves (Schaller et al, 2013).…”

Section: Hydathodes -Water Safety Valvesmentioning

confidence: 99%

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Barriers, pathways and processes for uptake, translocation and accumulation of nanomaterials in plants – Critical review

et al. 2015

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Uptake, transport and toxicity of engineered nanomaterials (ENMs) into plant cells are complex processes that are currently still not well understood. Parts of this problem are the multifaceted plant anatomy, and analytical challenges to visualize and quantify ENMs in plants. We critically reviewed the currently known ENM uptake, translocation, and accumulation processes in plants. A vast number of studies showed uptake, clogging, or translocation in the apoplast of plants, most notably of nanoparticles with diameters much larger than the commonly assumed size exclusion limit of the cell walls of ∼5-20 nm. Plants that tended to translocate less ENMs were those with low transpiration, drought-tolerance, tough cell wall architecture, and tall growth. In the absence of toxicity, accumulation was often linearly proportional to exposure concentration. Further important factors strongly affecting ENM internalization are the cell wall composition, mucilage, symbiotic microorganisms (mycorrhiza), the absence of a cuticle (submerged plants) and stomata aperture. Mostly unexplored are the roles of root hairs, leaf repellency, pit membrane porosity, xylem segmentation, wounding, lateral roots, nodes, the Casparian band, hydathodes, lenticels and trichomes. The next steps towards a realistic risk assessment of nanoparticles in plants are to measure ENM uptake rates, the size exclusion limit of the apoplast and to unravel plant physiological features favoring uptake.

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Section: Mucilage and Exudatesmentioning

confidence: 99%

Section: Non-endocytic Pathwaysmentioning

confidence: 99%

Section: Cell-level Imaging Of Nanoparticle Interactionsmentioning

confidence: 99%

Section: Hydathodes -Water Safety Valvesmentioning

confidence: 99%

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Barriers, pathways and processes for uptake, translocation and accumulation of nanomaterials in plants – Critical review

et al. 2015

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“…Silicon can also be found in many soil minerals that exist in the form of SiO 2 $nH 2 O upon weathering and the concentration of silica in the soil mixture varies among soils. Silica is beneficial or even essential for many organisms (Iler, 1977;Ingri, 1978;Schaller et al, 2013). For example, amorphous silica in grasses enhances biomass production (Eneji et al, 2008;Schaller et al, 2012), pathogen and herbivore defence (Fawe et al, 1998) and amelioration of abiotic stress (Matas et al, 2004).…”

Section: Introductionmentioning

confidence: 99%