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Role of Vfr in the regulation of antifungal compound production by Pseudomonas fluorescens FD6

文献类型： 外文期刊

作者： Zhang, Qingxia 1 ; Ji, Yanyan 1 ; Xiao, Qi 1 ; Chng, Soonie 2 ; Tong, Yunhui 1 ; Chen, Xijun 1 ; Liu, Fengquan 3 ;

作者机构： 1.Yangzhou Univ, Coll Plant Protect & Hort, Yangzhou 225009, Jiangsu, Peoples R China

2.Plant & Food Res Private Bag 4704, Christchurch 8140, New Zealand

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

关键词： Vfr;Antifungal compound;Pseudomonas;Biocontrol

期刊名称：MICROBIOLOGICAL RESEARCH （ 影响因子：5.415； 五年影响因子：6.038 ）

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收录情况： SCI

摘要： Pseudomonas fluorescens FD6 has been shown to possess many beneficial traits involved in the biocontrol of fungal plant pathogens, such as Botrytis cinerea and Monilinia fructicola. Vfr (virulence factor regulator) a highly conserved global regulator of gram-negative bacteria, such as the human pathogen Pseudomonas aeruginosa, is required for the expression of many important virulence traits. The role of Vfr in the regulation of biocontrol traits, such as the production of antibiotics to control fungal pathogens by antagonistic bacteria, has not been elucidated. This study investigated the effect of a vfr mutant derived from P. fluorescens FD6 to better understand the regulation of some important biocontrol traits associated with the bacterium. Biochemical studies indicated that the production of the antibiotics 2,4-diacetylphloroglucinol, pyrrolnitrin and pyoluteorin, was markedly enhanced in the vfr mutant. The vfr mutation also increased biofilm production, swimming motility and the expression of exopolysaccharide-associated gene (pelA, pslA and pslB) transcripts, but reduced protease production. Wheat rhizosphere and root tip colonization by the vfr mutant was higher than that by the wild type at 7 and 21 days after inoculation. These findings demonstrate that Vfr modulates the expression of several key traits and the production of important antibiotics involved in the biocontrol potential of P. fluorescens FD6. (C) 2016 Elsevier GmbH. All rights reserved.

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