Journal
JOURNAL OF FUNGI
Volume 6, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/jof6040294
Keywords
endophytic bacteria; silver nanoparticles; Magnaporthe oryzae; antifungal activity
Categories
Funding
- Shanghai Agriculture Applied Technology Development Program [2019-02-08-00-08-F01150]
- Zhejiang Provincial Natural Science Foundation of China [LZ19C140002]
- National Natural Science Foundation of China [31872017, 32072472, 31571971, 31801787, 31901925]
- Zhejiang Provincial Project [2017C02002, 2019C02006, 2020C02006]
- Key Scientific Technological Project of Ningbo [2016C11017, 2019B10004]
- National Key Research and Development Program of China [2018YFD0300900, 2017YFD0201104]
- Dabeinong Funds for Discipline Development and Talent Training in Zhejiang University
- State Key Laboratory for Managing Biotic and Chemical Treats to the Quality and Safety of Agro-products [2010DS700124-ZZ1907]
- Fundamental Research Funds for the Central Universities
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Biosynthesis of silver nanoparticles (AgNPs) using endophytic bacteria is a safe alternative to the traditional chemical method. The purpose of this research is to biosynthesize AgNPs using endophytic bacterium Bacillus endophyticus strain H3 isolated from onion. The biosynthesized AgNPs with sizes from 4.17 to 26.9 nm were confirmed and characterized by various physicochemical techniques such as Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), UV-visible spectroscopy, transmission electron microscopy (TEM) and scanning electron microscopy (SEM) in addition to an energy dispersive spectrum (EDS) profile. The biosynthesized AgNPs at a concentration of 40 mu g/mL had a strong antifungal activity against rice blast pathogen Magnaporthe oryzae with an inhibition rate of 88% in mycelial diameter. Moreover, the biosynthesized AgNPs significantly inhibited spore germination and appressorium formation of M. oryzae. Additionally, microscopic observation showed that mycelia morphology was swollen and abnormal when dealing with AgNPs. Overall, the current study revealed that AgNPs could protect rice plants against fungal infections.
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