Effects of silver nanoparticles on soil microorganisms and maize biomass are linked in the rhizosphere

Sillen, Wouter; Thijs, Sofie; Abbamondi, Gennaro Roberto; Janssen, Jolien; Weyens, Nele; White, Jason C.; Vangronsveld, Jaco

doi:10.1016/j.soilbio.2015.08.019

Cited by 133 publications

(47 citation statements)

References 31 publications

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“…Interestingly, Sharma et al (2012) reported that the AgNPs treatment improved the growth by modulating the antioxidant status of 7-day-old Brassica seedlings under in vitro conditions, also as reported by Karimi et al (2012) AgNPs application did not reduce germinability of wheat seed. Similar to our findings, Sillen et al (2015) reported that on applying AgNPs to soil, maize plant biomass was significantly enhanced. Increased nodulation was observed in cowpea in case of 50 ppm treatment; however, the exact mechanism behind this cannot be explained on the basis of the current study.…”

Section: Resultssupporting

confidence: 92%

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Impact assessment of silver nanoparticles on plant growth and soil bacterial diversity

et al. 2016

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The present study was carried out to investigate the impact of silver nanoparticles (AgNPs) on the growth of three different crop species, wheat (Triticum aestivum, var. UP2338), cowpea (Vigna sinensis, var. Pusa Komal), and Brassica (Brassica juncea, var. Pusa Jai Kisan), along with their impact on the rhizospheric bacterial diversity. Three different concentrations (0, 50 and 75 ppm) of AgNPs were applied through foliar spray. After harvesting, shoot and root parameters were compared, and it was observed that wheat was relatively unaffected by all AgNP treatments. The optimum growth promotion and increased root nodulation were observed at 50 ppm treatment in cowpea, while improved shoot parameters were recorded at 75 ppm in Brassica. To observe the impact of AgNPs on soil bacterial community, sampling was carried out from the rhizosphere of these crops at 20 and 40 days after the spraying of AgNPS. The bacterial diversity of these samples was analyzed by both cultural and molecular techniques (denaturing gradient gel electrophoresis). It is clearly evident from the results that application of AgNPs changes the soil bacterial diversity and this is further influenced by the plant species grown in that soil. Also, the functional bacterial diversity differed with different concentrations of AgNPs.Electronic supplementary materialThe online version of this article (doi:10.1007/s13205-016-0567-7) contains supplementary material, which is available to authorized users.

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Section: Resultssupporting

confidence: 92%

“…The dose-dependent effect of AgNPs on soil microbial community was also reported by Chunjaturas et al (2014). Sillen et al (2015) in their study suggested a link in increased biomass in maize only when there was a change in soil bacterial community, indicating that the microbial population was altered in a way to promote plant growth.…”

Section: Resultsmentioning

confidence: 99%

Impact assessment of silver nanoparticles on plant growth and soil bacterial diversity

et al. 2016

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“…Judy et al () found enriched Ag concentrations in Medicago truncatula grown on biosolid‐amended soils compared with control soils, coinciding with lower shoot biomass and lower nodulation; however, the biosolid also contained ZnNPs and TiO 2 ‐NPs, so results cannot be attributed solely to AgNPs. In contrast, in the study by Sillen et al () a higher biomass was obtained in maize grown on AgNP‐amended soils compared with control soils with no added AgNPs, although changes in microbial community and activity were noted. The importance of organic matter, and thus also the use of “real” soil, as a factor affecting AgNP toxicity was also investigated by several researchers: Calder et al () observed a mitigation of AgNP toxicity to Pseudomonas bacteria in soil compared with sand attributed to particle aggregation caused by humics; Peyrot et al () also observed alleviation of AgNP toxicity, assessed using enzyme activity, in organic matter–amended soils compared with unamended soils at equal AgNP doses; however, no mode of action was found.…”

Section: Introductionmentioning

confidence: 66%

Transformation‐dissolution reactions partially explain adverse effects of metallic silver nanoparticles to soil nitrification in different soils

Bollyn

Willaert

Kerré

et al. 2018

Enviro Toxic and Chemistry

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Risk assessment of metallic nanoparticles (NPs) is critically affected by the concern that toxicity goes beyond that of the metallic ion. The present study addressed this concern for soils with silver nanoparticles (AgNPs) using the Ag-sensitive nitrification assay. Three agricultural soils (A, B, and C) were spiked with equivalent doses of either AgNP (diameter = 13 nm) or AgNO . Soil solution was isolated and monitored over 97 d with due attention to accurate Ag fractionation at low (∼10 μg L ) Ag concentrations. Truly dissolved (<1 kDa) Ag in the AgNO -amended soils decreased with reaction half-lives of 4 to 22 d depending on the soil, denoting important Ag-aging reactions. In contrast, truly dissolved Ag in AgNP-amended soils first increased by dissolution and subsequently decreased by aging, the concentration never exceeding that in the AgNO -amended soils. The half-lives of AgNP transformation-dissolution were approximately 4 d (soils A and B) and 36 d (soil C). The Ag toxic thresholds (10% effect concentrations, milligrams of Ag per kilogram of soil) of nitrification, evaluated at 21 or 35 d after spiking, were similar between the 2 Ag forms (soils A and B) but were factors of 3 to 8 lower for AgNO than for AgNP (soil C), largely corroborating dissolution differences. This fate and bioassay showed that AgNPs are not more toxic than AgNO at equivalent total soil Ag concentrations and that differences in Ag dissolution at least partially explain toxicity differences between the forms and among soils. Environ Toxicol Chem 2018;37:2123-2131. © 2018 SETAC.

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“…The ability to produce metabolites enables the hyphae of the fungus to grow even on microbial-resistant polymers surface (Lugauskas et al, 2003). Since these microbes use oxidation products as a carbon source (Corti et al, 2010) they can cope with metal-stress more effectively than bacteria (Sillen et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Silver effect on the biodegradation process of styrene-ethylene/butylene-styrene based thermoplastic elastomers compounds upon weathering exposure

Tomacheski¹,

Pittol²,

Vier³

et al. 2018

Ecotoxicol. Environ. Contam.

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The incorporation of antibacterial additives in polymeric materials has become common to reduce the colonization of microorganisms in daily household items. This kind of product can be helpful to prevent diseases, but following the end of its useful lifetime, it might become an environmental problem, causing hazards also to the beneficial soil-borne microbes. This study aims to evaluate the effect of thermoplastic elastomers (TPEs) compounds loaded with silver ions (Ag + _bentonite, Ag + _phosphate) and nanoparticles (AgNp_silica) in the soil microbiota. Samples were exposed to weathering for 3, 6, 9 and 12 months, and monitored by carbon dioxide (CO 2 ) production in the soil for 4 months. Standard sample exposed to weather by 6, 9 and 12 months showed higher CO 2 production than samples unexposed or exposed for 3 months. By contrast, silver-loaded samples had higher CO 2 production in samples pre-aged for 3 months, but the values decreased in samples pre-aged for 6, 9 and 12 months. Moreover, soil microbial counts were lower in samples that had lower CO 2 production. Though the amount of silver in the soil has been lower than the limit of detection, after intense exposure to weather, the degradation of the polymer may have facilitated the release of silver from the TPE matrix, and on these terms, silver may have caused a harmful effect on soil fungi and bacterial population.

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Effects of silver nanoparticles on soil microorganisms and maize biomass are linked in the rhizosphere

Cited by 133 publications

References 31 publications

Impact assessment of silver nanoparticles on plant growth and soil bacterial diversity

Impact assessment of silver nanoparticles on plant growth and soil bacterial diversity

Transformation‐dissolution reactions partially explain adverse effects of metallic silver nanoparticles to soil nitrification in different soils

Silver effect on the biodegradation process of styrene-ethylene/butylene-styrene based thermoplastic elastomers compounds upon weathering exposure

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