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Agronomy 2019, 9(3), 140; https://doi.org/10.3390/agronomy9030140

Effects of Nanoparticles on Plant Growth-Promoting Bacteria in Indian Agricultural Soil

1
Caius Research Laboratory, St. Xavier’s College, Mumbai 400 001, India
2
Nanotechnology Research Group, Central Institute for Research on Cotton Technology, Mumbai 400 019, India
*
Author to whom correspondence should be addressed.
Received: 2 February 2019 / Revised: 11 March 2019 / Accepted: 13 March 2019 / Published: 18 March 2019
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Abstract

Soil bacteria are some of the key players affecting plant productivity. Soil today is exposed to emerging contaminants like metal engineered nanoparticles. The objective of this study was to evaluate the toxicological effects of silver and zinc oxide nanoparticles on bacteria classified as plant growth-promoting bacteria. Three types of bacteria—nitrogen fixers, phosphate solubilizers, and biofilm formers—were exposed to engineered nanoparticles. Initially, the effect of silver and zinc oxide nanoparticles was determined on pure cultures of the bacteria. These nanoparticles were then applied to soil to assess changes in composition of bacterial communities. Impacts of the nanoparticles were analyzed using Illumina MiSeq sequencing of 16S rRNA genes. In the soil used, relative abundances of the dominant and agriculturally significant phyla, namely, Proteobacteria, Actinobacteria, and Firmicutes, were altered in the presence of silver nanoparticles. Silver nanoparticles changed the abundance of the three phyla by 25 to 45%. Zinc oxide nanoparticles showed negligible effects at the phylum level. Thus, silver nanoparticles may impact bacterial communities in soil, and this in turn may influence processes carried out by soil bacteria. View Full-Text
Keywords: Ag nanoparticles; bacterial community composition; next generation sequencing; soil bacteria; ZnO nanoparticles Ag nanoparticles; bacterial community composition; next generation sequencing; soil bacteria; ZnO nanoparticles
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Chavan, S.; Nadanathangam, V. Effects of Nanoparticles on Plant Growth-Promoting Bacteria in Indian Agricultural Soil. Agronomy 2019, 9, 140.

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