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Selection and Antagonistic Mechanism of Pseudomonas fluorescens 4059 Against Phytophthora Blight Disease  

Jeong, Hui-Gyeong (Department of Applied Microbiology, College of Natural resources Yeungnam University)
Kim, Sang-Dal (Department of Applied Microbiology, College of Natural resources Yeungnam University)
Publication Information
Microbiology and Biotechnology Letters / v.32, no.4, 2004 , pp. 312-316 More about this Journal
Abstract
In oder to select the powerful rhizophere-dorminatable biocontrol agent, we had isolated an indigenous antagonistic bacterium which produced antibiotic and siderophore from a disease suppressive local field soil of Gyungsan, Korea. And we could select the Pseudomosp. 4059 which can strongly antagonize against Fusarium oxysporum and Phytophthora capsici by two kinds of antifungal mechanism that can be caused by the antibiotic of Phenazin, a siderophore and a auxin like subThe selected strain was identified as Pseudomonas fluorescens (biotype A) 4059 by biochemical tests, API $\textregistered$ test, MicroLog TM system and 16S rDNA analysis. The selected antagonistic microorganism, Pseudomosp. 4059 had an antifungal mechanism of antifungal antibiotic and sidrophore. And we were confirmed the antagonistic activity of P fluorescens 4059 with in vitro antifungal test against Phytophthora capsici and in vivo by red-pepper.
Keywords
Biocontrol; antifungal antibiotic; Phytophthora capsici; Pseudomonas fluorescens;
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