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Five strains ofEnterobacter cloacae that are biological control agents ofPythium damping-off diseases produced the hydroxamate siderophore aerobactin under iron-limiting conditions. Genes determining aerobactin biosynthesis of the biocontrol strainE. cloacae EcCT-501 were localized to a 12.3-kb region, which conferred aerobactin production toEscherichia coli DH5α. The aerobactin biosynthesis genes ofE. cloacae hybridized to those of the pColV-K30 plasmid ofE. coli , but restriction patterns of the aerobactin regions of pColV-K30 andE. cloacae differed. A derivative strain with a deletion in the aerobactin biosynthesis locus was as effective as strain EcCT-501 in biological control ofPythium damping-off of cucumber. Thus, aerobactin production did not contribute significantly to the biological control activity of EcCT-501 under the conditions of this study.

Cloning and Characterization of Aerobactin Biosynthesis Genes of the Biological Control Agent Enterobacter cloacae