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. Author manuscript; available in PMC: 2022 Mar 5.
Published in final edited form as: Science. 2021 Mar 5;371(6533):1033–1037. doi: 10.1126/science.abd1515

Fig. 3. Phenazines solubilize P and promote P. aeruginosa growth on HFO-P.

Fig. 3.

(A) Results of reactions between HFO-P and phenazines after 5 hours of anoxic incubation: Fe(II) (ferrozine assay), total soluble iron (ICP-MS), and total soluble phosphorus (ICP-MS). Nd: not detected. Error bars: standard deviations for duplicates. See Fig. S2 for details on P adsorption. (B) Model of reductive dissolution. The reaction of phenazine with Fe(III) is a two electron transfer yielding 2Fe(II) (15). Solubilized P is variable (indicate by n) depending on the extent of P surface coordination as dictated by P concentration, mineral composition, and pH (26). (C) Growth (as a denitrifier) of a P. aeruginosa mutant unable to make phenazines on HFO-P. Additions: 100 μM (reduced phenazine), 7mM (phosphate). Shaded area represents the standard deviation for biological duplicates.