Fig 1. Siderophore synthesis under iron limitation in B. xenovorans LB400.

A, Siderophore activity determined in supernatants of LB400 cells grown under iron-rich condition (a) and under iron limitation (b) and by the CAS assay of supernatants of LB400 cells grown under iron-rich condition (c) and under iron limitation (d). B, Effect of ornithine on LB400 growth and siderophore activity under iron limitation. LB400 cells were grown under iron-limitation in absence (control) or presence of ornithine (ornithine 5 mM), or under iron-rich condition (FeSO₄ 45 μM).