Summary
The growth and siderophore production of a fluorescentPseudomonas species isolated from soil contaminated with chromium was found to be influenced by the presence of trivalent cations. Overproduction of pseudobactin occurred when the isolate was grown in media containing 1 mM Cr(III) under ironlimited conditions but not when Fe(III) was added at 10 μM Pseudobactin synthesis was derepressed in iron-limited cultures containing 1 mM Sc(III) or Y(III), examples of group III-B elements. We found that AI(III), Ga(III) or In(III), representative metals from group III-A, repressed synthesis of pseudobactin under iron-deficient conditions. Analogs of Fe(III) were found to inhibit growth of thePseudomonas isolate in iron-limited media and the trivalent metals listed in order of decreasing toxicity were as follows: Ga > In > Sc > Cr > Y > Al. The inhibition of growth by 1 mM In(III), Sc(III) and Ga(III) was greater during iron-limited growth than in media containing 10 μM Fe(III). These data show that, although the metal analogs of Fe(III) have similar chemical and physical characteristics, the physiological response of the fluorescent pseudomonad when grown in the presence of these metals varied markedly.
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Fekete, F.A., Barton, L.L. Effects of iron(III) analogs on growth and pseudobactin synthesis in a chromiumtolerantPseudomonas isolate. Biol Metals 4, 211–216 (1991). https://doi.org/10.1007/BF01141183
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DOI: https://doi.org/10.1007/BF01141183