Journal of Food, Agriculture and Environment

Phosphate solubilization and screening for biosynthesis of silver nanoparticles by Aspergillus awamori isolated from rhizosphere soil of medicinal plant Coleus aromaticus 

Author(s):

V. Jyothi, S. Akarsh, H. V. Sowmya, Basaiah Thippeswamy

Recieved Date: 2022-07-06, Accepted Date: 2022-09-22

Abstract:

In this study a typical fungus was isolated from rhizosphere soil by serial dilution method using Pikovskaya’s medium and characterized based on morphological characters and confirmed by molecular characterization done by 18s r-RNA sequence as Aspergillus awamori and sequence was deposited at GenBank, NCBI (MN904869). The fungus showed good results in solubilization index (3.96), decreased pH (from 6.89 to 3.0), colour change from blue to yellow on agar plate and red to yellow in broth due to reduced acidic condition, titrable acidity (33.89 g/L) and phosphate (20 μg). The fungus produced catecholate nature of siderophore and indole acetic acid. In screening of silver nanoparticles synthesized by A. awamori, colour change from colourless to red and was visually observed and confirmed by UV-spectroscopy. Anti bacterial activity of silver nanoparticles against pathogens was tested by well diffusion assay. The diameter of the inhibition zone of was for Pseudomonas syringae 19.5 mm) , P. aeruginosa 18.5 mm, Klebsiella pneumonia 17.5 mm, Xanthomonas compestris 16 mm and E. coli 20.5 mm. E. coli was most susceptible to silver nanoparticles. Thus, due to the phosphate solubilization capacity of the fungus A. awamori, can be recommended as phosphate solubilizer in agricultural field and as able to promote plant growth due to production of plant growth promoting substances.

Keywords:

Phosphate, solubilization index, organic acid, siderophore, indole acetic acid

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Journal: Journal of Food, Agriculture and Environment
Year: 2022
Volume: 20
Issue: 3&4
Category: Environment
Pages: 105-111

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