Ferrihydrite Reduction by Photosynthetic Synechocystis sp. PCC 6803 and Its Correlation With Electricity Generation.
Ferrihydrite Reduction by Photosynthetic Synechocystis sp. PCC 6803 and Its Correlation With Electricity Generation.
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DOI：
10.3389/fmicb.2021.650832
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发表时间：
2021
影响因子：
5.2
通讯作者：
Nakanishi S
中科院分区：
文献类型：
--
作者：
Tanaka K;Shimakawa G;Kusama S;Harada T;Kato S;Nakanishi S
微生物胞外电子转移（EET）是微生物产电和金属地球化学循环的关键过程，最初发现于异化金属还原菌中。虽然现在已知光合微生物也可以通过EET产生（光）电流，这在生物光子学领域引起了很大的兴趣，但是关于通过光合微生物EET还原金属（氢）氧化物知之甚少。目前的工作定量评估还原的水铁矿结合EET的光合微生物集胞藻属PCC 6803。微生物还原的水铁矿被认为是在响应于光，但在更高的速率进行时，外源性葡萄糖被添加，即使在黑暗的条件下。这些结果表明，集胞藻细胞的当前世代并不总是需要光照射。在各种条件下的水铁矿还原率所表现出的定性趋势与微生物电流的相关性显着。值得注意的是，在黑暗条件下，在葡萄糖的存在下，由蓝藻细胞产生的Fe（II）的最大浓度与富Fe微生物垫的透光层中观察到的水平相当。
Microbial extracellular electron transfer (EET) to solid-state electron acceptors such as anodes and metal oxides, which was originally identified in dissimilatory metal-reducing bacteria, is a key process in microbial electricity generation and the biogeochemical cycling of metals. Although it is now known that photosynthetic microorganisms can also generate (photo)currents via EET, which has attracted much interest in the field of biophotovoltaics, little is known about the reduction of metal (hydr)oxides via photosynthetic microbial EET. The present work quantitatively assessed the reduction of ferrihydrite in conjunction with the EET of the photosynthetic microbe Synechocystis sp. PCC 6803. Microbial reduction of ferrihydrite was found to be initiated in response to light but proceeded at higher rates when exogenous glucose was added, even under dark conditions. These results indicate that current generation from Synechocystis cells does not always need light irradiation. The qualitative trends exhibited by the ferrihydrite reduction rates under various conditions showed significant correlation with those of the microbial currents. Notably, the maximum concentration of Fe(II) generated by the cyanobacterial cells under dark conditions in the presence of glucose was comparable to the levels observed in the photic layers of Fe-rich microbial mats.
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