FIG 8.

The regulation of NFS by gacS-gacA is through the Gac/Rsm signaling cascade. (A) Siderophore production in wild-type HYS and the genetically modified strains was detected on CAS agar plates. (B) Siderophore production in wild-type HYS and the derivative strains in liquid MKB medium was determined as siderophore units (percent) by the CAS liquid assay. (C) Absorption spectra of filtered supernatants of 24-h MKB cultures of wild-type HYS and the derivative strains. The error bars indicate standard deviations.