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Vol. 4 No. 3 (2012)

Effect of Silver Nanoparticles on Growth of Eukaryotic Green Algae

https://doi.org/10.1007/BF03353707
Anjali Dash
Department of Biochemistry, Institute of Medical Sciences, Banaras Hindu University, Varanasi-221005, India
Anand P. Singh
Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi-221005, India
Bansh R. Chaudhary
Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi-221005, India
Sunil K. Singh
Department of Biochemistry, Institute of Medical Sciences, Banaras Hindu University, Varanasi-221005, India
Debabrata Dash
Department of Biochemistry, Institute of Medical Sciences, Banaras Hindu University, Varanasi-221005, India

Corresponding Author: Anjali Dash

ddass@sify.com

Nano-Micro Letters, Vol. 4 No. 3 (2012), Article Number: 158-165

Abstract

Silver nanoparticles, endowed with powerful antimicrobial property, are the most widely used nanomaterial in consumer products, with associated risk of their easy access to environment and freshwater ecosystems by surface runoff. Although toxic effects of nanosilver on bacterial, fungal and mammalian cells have been documented, its impact on algal growth remains unknown. Pithophora oedogonia and Chara vulgaris are predominant members of photosynthetic eukaryotic algae, which form major component of global aquatic ecosystem. Here we report for the first time that nanosilver has significant adverse effects on growth and morphology of these filamentous green algae in a dose-dependent manner. Exposure of algal thalli to increasing concentrations of silver nanoparticles resulted in progressive depletion in algal chlorophyll content, chromosome instability and mitotic disturbance, associated with morphological malformations in algal filaments. SEM micrographs revealed dramatic alterations in cell wall in nanoparticle-treated algae, characterized with cell wall rupture and degradation in Pithophora. Although these observations underscore severe deleterious effects of nanosilver on aquatic environment, the information can also be exploited as a bioengineering strategy to control unwanted and persistent growth of noxious algal weeds that clog the municipal water supply and water channels and produce fouling of water bodies.

Keywords

Silver nanoparticles Green algae Algal growth Photosynthetic pigment Nanotoxicity
Dash, Anjali, Anand P. Singh, Bansh R. Chaudhary, Sunil K. Singh, and Debabrata Dash. 2012. “Effect of Silver Nanoparticles on Growth of Eukaryotic Green Algae”. Nano-Micro Letters 4 (3):158-65. https://doi.org/10.1007/BF03353707.
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