Organic Matter Complexation Promotes Fe(II) Oxidation by the Photoautotrophic Fe(II)-Oxidizer Rhodopseudomonas palustris TIE-1
Organic Matter Complexation Promotes Fe(II) Oxidation by the Photoautotrophic Fe(II)-Oxidizer Rhodopseudomonas palustris TIE-1
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DOI：
10.1021/acsearthspacechem.9b00024
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发表时间：
2019-02
影响因子：
3.4
通讯作者：
Chao Peng;C. Bryce;Anneli Sundman;T. Borch;A. Kappler
中科院分区：
文献类型：
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作者：
Chao Peng;C. Bryce;Anneli Sundman;T. Borch;A. Kappler
Fe(II)-有机物 (Fe(II)-OM) 复合物存在于水生环境的透光区，由于其反应性，可能在生物地球化学循环中发挥重要作用。 Fe 的络合已被证明会影响许多化学和微生物氧化还原反应的速率和程度。然而，目前尚不清楚 Fe(II)-OM 复合物是否可以、多快以及在多大程度上可以被缺氧光自养型 Fe(II) 氧化微生物氧化，这些微生物广泛存在于光生境中，并利用 Fe(II) 的电子来固定 CO2。在这里，我们使用光合自养 Fe(II) 氧化剂沼泽红假单胞菌 TIE-1 来证明，与非有机结合的游离 Fe(II) 的氧化相比，OM 与 Fe(II) 的络合显着加速了菌株 TIE-1 氧化 Fe(II) 的速率，尽管以 Fe(II)-OM 络合物形式存在的一小部分 Fe(II) 似乎能够抵抗微生物氧化。对 Fe-OM 聚集体尺寸的分析表明，剩余的未氧化的 Fe(II) 和几乎所有的...
Fe(II)–organic matter (Fe(II)–OM) complexes are present in the photic zone of aquatic environments and due to their reactivity may play an important role in biogeochemical cycling. Complexation of Fe has been shown to influence the rates and extent of many chemical and microbial redox reactions. However, it is currently unknown whether, how fast, and to which extent Fe(II)–OM complexes can be oxidized by anoxygenic photoautotrophic Fe(II)-oxidizing microorganisms which are widespread in photic habitats and use electrons from Fe(II) to fix CO2. Here, we used the photoautotrophic Fe(II)-oxidizer Rhodopseudomonas palustris TIE-1 to demonstrate that Fe(II) complexation by OM significantly accelerated the rates of Fe(II) oxidation by strain TIE-1 compared to the oxidation of nonorganically bound, free Fe(II), although a fraction of the Fe(II) present as Fe(II)–OM complexes seemed to resist microbial oxidation. Analysis of Fe–OM aggregate sizes showed that the remaining, nonoxidized Fe(II) and almost all of the...