Bioengineered silver nanoparticles using Curvularia pallescens and its fungicidal activity against Cladosporium fulvum

Abstract

Microorganisms based biosynthesis of nanomaterials has triggered significant attention, due to their great potential as vast source of the production of biocompatible nanoparticles (NPs). Such biosynthesized functional nanomaterials can be used for various biomedical applications. The present study investigates the green synthesis of silver nanoparticles (Ag NPs) using the fungus Curvularia pallescens (C. pallescens) which is isolated from cereals. The C. pallescens cell filtrate was used for the reduction of AgNO3 to Ag NPs. To the best of our knowledge C. pallescens is utilized first time for the preparation of Ag NPs. Several alkaloids and proteins present in the phytopathogenic fungus C. pallescens were mainly responsible for the formation of highly crystalline Ag NPs. The as-synthesized Ag NPs were characterized by using UV–Visible spectroscopy, X-ray diffraction and transmission electron microscopy (TEM). The TEM micrographs have revealed that spherical shaped Ag NPs with polydisperse in size were obtained. These results have clearly suggested that the biomolecules secreted by C. pallescens are mainly responsible for the formation and stabilization of nanoparticles. Furthermore, the antifungal activity of the as-prepared Ag NPs was tested against Cladosporium fulvum, which is the major cause of a serious plant disease, known as tomato leaf mold. The synthesized Ag NPs displayed excellent fungicidal activity against the tested fungal pathogen. The extreme zone of reduction occurred at 50 μL, whereas, an increase in the reduction activity is observed with increasing the concentration of Ag NPs. These encouraging results can be further exploited by employing the as synthesized Ag NPs against various pathogenic fungi in order to ascertain their spectrum of fungicidal activity.

Plant performance of enhancing licorice with dual inoculating dark septate endophytes and Trichoderma viride mediated via effects on root development

“…P. radicina was isolated in the root surfaces of soybean [27]. C. pallescens was found on the surfaces of banana fruits [28], in cereals [29], and on the Fig. 4 The causal relationships among DSE species, T. viride, root morphology and plant aboveground morphology based on structural equation model (SEM).…”

“…P. radicina was isolated in the root surfaces of soybean [ 27 ]. C. pallescens was found on the surfaces of banana fruits [ 28 ], in cereals [ 29 ], and on the leaves of Lippia sidoides and Humboldtia brunonis [ 30 , 31 ]. P. herbarum was observed in the roots of salt-stressed soybean plants [ 32 ].…”

<p>Antibacterial activity and mechanism of silver nanoparticles against multidrug-resistant <em>Pseudomonas aeruginosa</em></p>

“…Nowadays, nanoparticles have achieved remarkable attention as novel antimicrobial products as they possess high surface area-to-volume ratio and unique physical and chemical properties. [7][8][9][10] The different metals including silver, copper, titanium, zinc, and gold are used as antimicrobial materials. Hernándezsierra et al compared the anti-Streptococcus mutans activity of nano scale silver, gold, and zinc oxide and found that silver nanoparticles (AgNPs) worked best.…”

Silver nanoparticles synthesized by Nigrospora oryzae showed antifungal activity

“…The successful formation of Ag NPs was verified using various analytical techniques UV–vis, XRD, TEM, and EDS measurements. Myco-synthesis Ag NPs was tested for antifungal effect against eight species of Fusaria causing damping-off of cotton seedlings ( Elgorban et al, 2017 , Yassin et al, 2017a , Yassin et al, 2017b ). The study aimed to eradicate pathogenic plant microorganisms without using synthetic chemical.…”