Effect of biologically synthesized silver nanoparticles on Bacopa monnieri (Linn.) Wettst. plant growth metabolism

► This method of nanoparticles synthesis is advantageous over other biobased protocols. ► Characterization studies highly supported the formation of silver nanoparticles. ► Due to high toxicity of silver nitrate at 100ppm plant germination was very much affected. ► Interestingly, silver nanoparticle...

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Bibliographic Details
Published in:Process biochemistry (1991) 2012-04, Vol.47 (4), p.651-658
Main Authors: Krishnaraj, C., Jagan, E.G., Ramachandran, R., Abirami, S.M., Mohan, N., Kalaichelvan, P.T.
Format: Article
Language:English
Subjects:
Acalypha indica
AgNO3
antioxidants
atomic absorption spectrometry
Bacopa monnieri
Bacopa monnieri (Linn.) Wettst
Catalase
hydroponics
leaf extracts
medicinal plants
metabolism
nanosilver
Peroxidase
phenols
plant growth
reducing agents
scanning electron microscopy
silver
Silver nanoparticles
silver nitrate
tissues
toxicity
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Summary:► This method of nanoparticles synthesis is advantageous over other biobased protocols. ► Characterization studies highly supported the formation of silver nanoparticles. ► Due to high toxicity of silver nitrate at 100ppm plant germination was very much affected. ► Interestingly, silver nanoparticles treated plant showed no toxic effects at higher concentration. In this present study, interactions of biologically synthesized silver nanoparticles on hydroponically grown Bacopa monnieri (Linn.) Wettst. plant growth metabolism were documented. Estimates of protein, carbohydrate, total phenols, in addition antioxidant enzymes, catalase and peroxidise were assayed in various parts of the plants grown in hydroponic solution. The silver nanoparticles used in this study were synthesized by treating AgNO3 with aqueous leaves extracts of Acalypha indica Linn., a medicinal herb as a source of reductants. Enhanced peroxidase and catalase activity, simulated the stress conditions induced by the silver nitrate treatment. No severe toxic effects were observed in silver nanoparticles treated plants in the morphological studies under scanning electron microscopy (SEM) while structural aberrations were observed in the light microscopic evaluation of root and stem anatomy. Further, the uptake of silver in the root and stem tissues of B. monnieri (Linn.) Wettst. was confirmed using atomic absorption spectrophotometer (AAS).
ISSN:1359-5113
1873-3298
DOI:10.1016/j.procbio.2012.01.006