Photobiosynthesis of Silver Nanoparticle Using Extract of Aspergillus flavus CR500: Its Characterization, Antifungal Activity and Mechanism Against Sclerotium rolfsii and Rhizoctonia solani
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Newly biosynthesized metallic nanoparticle with antimicrobial characteristic attracted its demand in the field of disease management. The present study deals with the synthesis of silver nanoparticle using the extract Aspergillus flavus CR500 under the presence of sunlight. The characterization via scanning and transmission electron microscope revealed their size distribution ranges from 60 to 130 nm with a high content of Ag, confirmed by energy dispersive X-ray spectroscopic analysis. X-ray diffraction and Fourier transform infrared analysis exposed the crystalline nature and active functional group availability on silver nanoparticle (AgNPs). Photobiosynthesized AgNPs have high antimicrobial property and completely inhibited the growth of plant pathogenic fungi Rhizoctonia solani GPB and Sclerotium rolfsii at the concentration of 150 and 300 µg/L respectively. AgNPs exposure increases the lipid peroxidation (via reactive oxygen species production) in R. solani and S. rolfsii, might be a primary cause of AgNPs toxicity to fungal cell. However, fungal cell responded to oxidative stress caused by AgNPs by increasing the catalase and peroxidase activity. In order to assess the AgNPs applicability in seed protection and its impact on germination, growth and development of the crop, Cicer arietinum and Vigna radiata seeds were used for growth and germination assay under AgNPs exposure.
KeywordsNanoparticle Shape and size of AgNPs, Antifungal mechanism Oxidative stress Antioxidants
The authors are thankful to the Head of the Department of Environmental Science, BBAU, Lucknow, India for providing Laboratory Facility. The authors are also thankful to National Centre for Microbial Resource (NCMR), Pune, India for providing Gene Sequencing Facility, the Director, USIC, BBAU, Lucknow for SEM and FTIR analysis and the support provided by Jiwaji University, Gwalior (M. P.) for XRD and TEM analysis. Two of us (Vinay Kumar and Ganesh Prasad) are grateful to UGC, New Delhi, India for providing fellowship.
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Conflict of interest
The authors declare that they have no conflict of interest.
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