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KMID : 0545120120220060763
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Journal of Microbiology and Biotechnology
2012 Volume.22 No. 6 p.763 ~ p.770
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Colonizing Ability of Pseudomonas fluorescens 2112, Among Collections of 2,4-Diacetylphloroglucinol-Producing Pseudomonas fluorescens spp. in Pea Rhizosphere
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Kim Sang-Dal
Leonardo De La Fuente
David M. Weller
Linda S. Thomashow
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Abstract
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Pseudomonas fluorescens 2112, isolated in Korea as an indigenous antagonistic bacteria, can produce 2,4- diacetylphloroglucinol (2,4-DAPG) and the siderophore pyoveridin2112 for the control of phytophthora blight of red-pepper. P. fluorescens 2112 was classified into a new genotype C among the 17 genotypes of 2,4-DAPG producers, by phlD restriction fragment length polymorphism (RFLP). The colonizing ability of P. fluorescens 2112 in pea rhizosphere was equal to the well-known pea colonizers, P. fluorescens Q8r1 (genotype D) and MVP1-4 (genotype P), after 6 cycling cultivations for 18 weeks. Four tested 2,4- DAPG-producing Pseudomonas spp. could colonize with about a 96% dominance ratio against total bacteria in pea rhizosphere. The strain P. fluorescens 2112 was as good a colonizer as other Pseudomonas spp. genotypes in pea plant growth-promoting rhizobacteria.
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KEYWORD
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Pseudomonas fluorescens 2112, 2, 4-diacethylphloroglucinol (2, 4-DAPG), root colonization, plant growth promoting rhizobacteria (PGPR), Pea root
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