Biosynthesis of Silver Nanoparticles Using Onion Endophytic Bacterium and Its Antifungal Activity against Rice Pathogen Magnaporthe oryzae
文献类型： 外文期刊
作者： Ibrahim, Ezzeldin 1 ; Luo, Jinyan 3 ; Ahmed, Temoor 1 ; Wu, Wenge 4 ; Yan, Chenqi 5 ; Li, Bin 1 ;
作者机构： 1.Zhejiang Univ, Inst Biotechnol, State Key Lab Rice Biol, Minist Agr,Key Lab Mol Biol Crop Pathogens & Inse, Hangzhou 310058, Peoples R China
2.Agr Res Ctr, Plant Pathol Res Inst, Dept Vegetable Dis Res, Giza 12916, Egypt
3.Shanghai Extens & Serv Ctr Agr Technol, Dept Plant Quarantine, Shanghai 201103, Peoples R China
4.Anhui Acad Agr Sci, Rice Res Inst, Hefei 230001, Peoples R China
5.Ningbo Acad Agr Sci, Inst Biotechnol, Ningbo 315040, Peoples R China
关键词： endophytic bacteria; silver nanoparticles; Magnaporthe oryzae; antifungal activity
期刊名称：JOURNAL OF FUNGI （ 影响因子：5.816； 五年影响因子：6.499 ）
ISSN：
年卷期： 2020 年 6 卷 4 期
页码：
收录情况： SCI
摘要： 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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