Journal
GEOMICROBIOLOGY JOURNAL
Volume 31, Issue 9, Pages 835-843Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01490451.2014.901439
Keywords
carbon flow; iron redox cycling; phototrophic Fe(II) oxidation
Funding
- Deutsche Forschungsgemeinschaft (DFG) [KA1736/16-1]
- Marie Curie ERG grant [PERF04-GA-2008-239252]
- Landesgraduiertenforderung fellowship [Gz 11.2_7631.2/Melton]
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It is unknown to which extent phototrophic Fe(II) oxidation takes place in the simultaneous presence of organic electron donors (e.g., acetate/lactate). Therefore, the photoferrotrophic strain Rhodopseudomonas palustris TIE-1 was inoculated with various combinations of Fe(II), acetate and lactate to understand metabolic substrate preference. When acetate was provided together with Fe(II), TIE-1 consumed acetate first before Fe(II). When provided lactate plus Fe(II), TIE-1 consumed both substrates in parallel. When all three substrates were provided in one culture, TIE-1 used all substrates simultaneously. Our study suggests that the availability of alternative electron donors in addition to ferrous iron limits phototrophic iron oxidation.
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