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. 2017 Apr;11(3):236-240.
doi: 10.1049/iet-nbt.2015.0121.

In vitro and in vivo antifungal properties of silver nanoparticles against Rhizoctonia solani, a common agent of rice sheath blight disease

Meysam Soltani Nejad  1 , Gholam Hosein Shahidi Bonjar  2 , Mehrdad Khatami  3 , Abbas Amini  4 , Sonia Aghighi  5
Affiliations

In vitro and in vivo antifungal properties of silver nanoparticles against Rhizoctonia solani, a common agent of rice sheath blight disease

Meysam Soltani Nejad et al. IET Nanobiotechnol. 2017 Apr.

Abstract

Sheath blight disease in rice has caused major crop losses worldwide. Managing the causal agent of disease Rhizoctonia solani Kühn is difficult because of its broad host range and formation of sclerotia which can survive in harsh environmental conditions; therefore developing innovative disease management methods without application of hazardous chemicals has been considered as the main concern to maintain sustainable agriculture. This presented research has revealed the negative impact of silver nanoparticles (SNPs) on R. solani and disease progress both in vitro and in vivo. The adverse effects of the SNPs on R. solaniare significantly dependent on the quantity of SNPs, sprayed at different concentrations in vitro. The highest inhibition level against sclerotia formation and mycelia growth are 92 and 85%, respectively, at a SNPs concentration of 50 ppm. In vivo glasshouse experiments also showed that SNPs at the same concentration favourably affects both the fresh and dry weight of rice plants with a remarkable suppressive effect on the lesion development in leaves.

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Figures

Fig. 1
Fig. 1
In vitro inhibitory effects of different concentrations of SNPs (indicated in the top right of left column) on R. solani AG1 Mycelia growth stage [left column (a) – (e) ], Sclerotia formation [middle column (f) –(j) ], Sclerotia germination [right column (k) –(o) ]
Fig. 2
Fig. 2
In vitro RH of SNPs effects on mycelia growth, sclerotia germination and sclerotia formation of R. solani AG1‐IA
Fig. 5
Fig. 5
Effect of SNPs on the lesion development by R. solani on rice sheath (a) Pathogen alone, (b) Pathogen + SNPs (5 ppm), (c) Pathogen + SNPs (10 ppm), (d) Pathogen + SNPs (25 ppm), (e) Pathogen + SNPs (50 ppm), (f) Untreated control
Fig. 4
Fig. 4
Effect of SNPs treatment on the lesion development by R. solani on rice leaves (a) Pathogen alone, (b) Pathogen + SNPs (5 ppm), (c) Pathogen + SNPs (10 ppm), (d) Pathogen + SNPs (25 ppm), (e) Pathogen + SNPs (50 ppm), (f) Untreated control
Fig. 3
Fig. 3
Rice seedlings after 90 days under greenhouse conditions, with a temperature of 30°C and constant humidity of 85–95%
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