FIG. 6.
Absorption spectra of filtered thrice-diluted supernatants of 3-day GASN cultures of P. syringae pv. syringae LMG 1247 (curve a) and P. putida LMG 2257 (curve b), as well as of filtered undiluted supernatant of a 3-day GASN culture of P. syringae pv. aptata UPB 133 (curve c), containing Fe(III)-chelated siderophores.