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http://dx.doi.org/10.5423/PPJ.NT.01.2013.0013

The RpoS Sigma Factor Negatively Regulates Production of IAA and Siderophore in a Biocontrol Rhizobacterium, Pseudomonas chlororaphis O6  

Oh, Sang A (Institute of Environmentally-Friendly Agriculture, Chonnam National University)
Kim, Ji Soo (Institute of Environmentally-Friendly Agriculture, Chonnam National University)
Park, Ju Yeon (Institute of Environmentally-Friendly Agriculture, Chonnam National University)
Han, Song Hee (Institute of Environmentally-Friendly Agriculture, Chonnam National University)
Dimkpa, Christian (Department of Biology, Utah State University)
Anderson, Anne J. (Department of Biology, Utah State University)
Kim, Young Cheol (Institute of Environmentally-Friendly Agriculture, Chonnam National University)
Publication Information
The Plant Pathology Journal / v.29, no.3, 2013 , pp. 323-329 More about this Journal
Abstract
The stationary-phase sigma factor, RpoS, influences the expression of factors important in survival of Pseudomonas chlororaphis O6 in the rhizosphere. A partial proteomic profile of a rpoS mutant in P. chlororaphis O6 was conducted to identify proteins under RpoS regulation. Five of 14 differentially regulated proteins had unknown roles. Changes in levels of proteins in P. chlororaphis O6 rpoS mutant were associated with iron metabolism, and protection against oxidative stress. The P. chlororaphis O6 rpoS mutant showed increased production of a pyoverdine-like siderophore, indole acetic acid, and altered isozyme patterns for peroxidase, catalase and superoxide dismutase. Consequently, sensitivity to hydrogen peroxide exposure increased in the P. chlororaphis O6 rpoS mutant, compared with the wild type. Taken together, RpoS exerted regulatory control over factors important for the habitat of P. chlororaphis O6 in soil and on root surfaces. The properties of several of the proteins in the RpoS regulon are currently unknown.
Keywords
indole acetic acid; iron; oxidative stress; proteomic analysis; sigma factor RpoS;
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