Abstract
This study provides new information on the Fe uptake system capable of supporting growth of the organism. Pseudomonas fluorescens isolated from the rhizosphere of barley, a gramineous plant, produced a siderophore under iron-limiting conditions. Its chemical structure was identified as pyochelin, on the basis of 1H and 13C NMR data of a stable methyl ester derivative. The same iron-limiting conditions induced a new set of outer membrane proteins (75 and 55 kDa), consistent with a siderophore-mediated iron-uptake system.
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