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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/20494

Title: Effects of silver nanoparticles on soil microorganisms and maize biomass are linked in the rhizosphere
Authors: Sillen, Wouter M. A.
Thijs, Sofie
Abbamondi, Gennaro Roberto
Janssen, Jolien
Weyens, Nele
White, Jason C.
Vangronsveld, Jaco
Issue Date: 2015
Citation: Soil biology & biochemistry, 91, p. 14-22
Abstract: Silver nanoparticles hold great promise as effective anti-microbial compounds in a myriad of applications but may also pose a threat to non-target bacteria and fungi in the environment. Because microorganisms are involved in extensive interactions with many other organisms, these partner species are also prone to indirect negative effects from silver nanoparticles. Here, we focus on the effects of nanosilver exposure in the rhizosphere. Specifically, we evaluate the effect of 100 mg kg(-1) silver nanoparticles on maize plants, as well as on the bacteria and fungi in the plant's rhizosphere and the surrounding bulk soil. Maize biomass measurements, microbial community fingerprints, an indicator of microbial enzymatic activity, and carbon use diversity profiles are used. Hereby, it is shown that 100 mg kg(-1) silver nanoparticles in soil increases maize biomass, and that this effect coincides with significant alterations of the bacterial communities in the rhizosphere. The bacterial community in nanosilver exposed rhizosphere shows less enzymatic activity and significantly altered carbon use and community composition profiles. Fungal communities are less affected by silver nanoparticles, as their composition is only slightly modified by nanosilver exposure. In addition, the microbial changes noted in the rhizosphere were significantly different from those noted in the bulk soil, indicated by different nanosilver-induced alterations of carbon use and community composition profiles in bulk and rhizosphere soil. Overall, microorganisms in the rhizosphere seem to play an important role when evaluating the fate and effects of silver nanoparticle exposure in soil, and not only is the nanosilver response different for bacteria and fungi, but also for bulk and rhizosphere soil. Consequently, assessment of microbial populations should be considered an essential parameter when investigating the impacts of nanoparticle exposure. (C) 2015 Elsevier Ltd. All rights reserved.
Notes: [Sillen, Wouter M. A.; Thijs, Sofie; Abbamondi, Gennaro Roberto; Janssen, Jolien; Weyens, Nele; Vangronsveld, Jaco] Hasselt Univ, Ctr Environm Sci, B-3590 Diepenbeek, Belgium. [Abbamondi, Gennaro Roberto] Natl Res Council Italy, Inst Biomol Chem, I-80078 Naples, Italy. [White, Jason C.] Connecticut Agr Expt Stn, Dept Analyt Chem, New Haven, CT 06504 USA.
URI: http://hdl.handle.net/1942/20494
DOI: 10.1016/j.soilbio.2015.08.019
ISI #: 000364502900002
ISSN: 0038-0717
Category: A1
Type: Journal Contribution
Validation: ecoom, 2016
Appears in Collections: Research publications

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