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The Role of Pyoluteorin from Pseudomonas protegens Pf-5 in Suppressing the Growth and Pathogenicity of Pantoea ananatis on Maize

文献类型： 外文期刊

作者： Gu, Qin 1 ; Qiao, Junqing 2 ; Wang, Ruoyi 1 ; Lu, Juan 1 ; Wang, Zhengqi 1 ; Li, Pingping 1 ; Zhang, Lulu 1 ; Ali, Qurban 1 ; Khan, Abdur Rashid 1 ; Gao, Xuewen 1 ; Wu, Huijun 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Plant Protect, Dept Plant Pathol, Key Lab Integrated Management Crop Dis & Pests, Nanjing 210095, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Plant Protect, Nanjing 210014, Peoples R China

关键词： Pseudomonas protegens; Pantoea ananatis; pyoluteorin; orfamide; biofilm; biocontrol

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：6.208； 五年影响因子：6.628 ）

ISSN：

年卷期： 2022 年 23 卷 12 期

页码：

收录情况： SCI

摘要： The rhizospheric bacterium Pseudomonas protegens Pf-5 can colonize the seed and root surfaces of plants, and can protect them from pathogen infection. Secondary metabolites, including lipopeptides and polyketides produced by Pf-5, are involved in its biocontrol activity. We isolated a crude extract from Pf-5. It exhibited significant surface activity and strong antibacterial activity against Pantoea ananatis DZ-12, which causes maize brown rot on leaves. HPLC analysis combined with activity tests showed that the polyketide pyoluteorin in the crude extract participated in the suppression of DZ-12 growth, and that the lipopeptide orfamide A was the major biosurfactant in the crude extract. Further studies indicated that the pyoluteorin in the crude extract significantly suppressed the biofilm formation of DZ-12, and it induced the accumulation of reactive oxygen species in DZ-12 cells. Scanning electron microscopy and transmission electron microscopy observation revealed that the crude extract severely damaged the pathogen cells and caused cytoplasmic extravasations and hollowing of the cells. The pathogenicity of DZ-12 on maize leaves was significantly reduced by the crude extract from Pf-5 in a dose-dependent manner. The polyketide pyoluteorin had strong antibacterial activity against DZ-12, and it has the potential for development as an antimicrobial agent.

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