Metabolic Flexibility and Substrate Preference by the Fe(II)-Oxidizing Purple Non-Sulphur Bacterium Rhodopseudomonas palustris Strain TIE-1 |
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Authors: | E D Melton C Schmidt S Behrens B Schink |
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Institution: | 1. Department of Geomicrobiology, Center for Applied Geosciences, University of Tübingen, Tübingen, Germany;2. Department of Biology, University of Konstanz, Constance, Germany |
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Abstract: | 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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Keywords: | carbon flow iron redox cycling phototrophic Fe(II) oxidation |
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