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  Cyanobacteria in Sulfidic Spring Microbial Mats Can Perform Oxygenic and Anoxygenic Photosynthesis Simultaneously during an Entire Diurnal Period

Klatt, J., de Beer, D., Hausler, S., & Polerecky, L. (2016). Cyanobacteria in Sulfidic Spring Microbial Mats Can Perform Oxygenic and Anoxygenic Photosynthesis Simultaneously during an Entire Diurnal Period. Frontiers in Microbiology, 7:, pp. 1-10.

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アイテムのパーマリンク: https://hdl.handle.net/21.11116/0000-0001-C226-9 版のパーマリンク: https://hdl.handle.net/21.11116/0000-0003-0909-A
資料種別: 学術論文

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F_Klatt_2016_02_7.pdf (出版社版), 4MB
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https://hdl.handle.net/21.11116/0000-0003-090A-9
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F_Klatt_2016_02_7.pdf
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 作成者:
Klatt, J.1, 著者           
de Beer, D.1, 著者           
Hausler, S.1, 著者           
Polerecky, L.1, 著者           
所属:
1Permanent Research Group Microsensor, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481711              

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 要旨: We used microsensors to study the regulation of anoxygenic and oxygenic photosynthesis (AP and OP, respectively) by light and sulfide in a cyanobacterium dominating microbial mats from cold sulfidic springs. Both photosynthetic modes were performed simultaneously over all H2S concentrations (1-2200 mu M) and irradiances (4-52 mu mol photons m(-2) s(-1)) tested. AP increased with H2S concentration while the sum of oxygenic and anoxygenic photosynthetic rates was constant at each light intensity. Thus, the total photosynthetically driven electron transport rate was solely controlled by the irradiance level. The partitioning between the rates of these two photosynthetic modes was regulated by both light and H2S concentration. The plastoquinone pool (PQ) receives electrons from sulfide:quinone:reductase (SQR) in AP and from photosystem II (PSII) in OR It is thus the link in the electron transport chain where both pathways intersect, and the compound that controls their partitioning. We fitted our data with a model of the photosynthetic electron transport that includes the kinetics of plastoquinone reduction and oxidation. The model results confirmed that the observed partitioning between photosynthetic modes can be explained by a simple kinetic control based on the affinity of SQR and PSII toward PQ. The SQR enzyme and PSII have similar affinities toward PQ, which explains the concurrent OP and AP over an astonishingly wide range of H2S concentrations and irradiances. The elegant kinetic control of activity makes the cyanobacterium successful in the fluctuating spring environment. We discuss how these specific regulation mechanisms may have played a role in ancient H2S-rich oceans.

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言語: eng - English
 日付: 2016-12-15
 出版の状態: 出版
 ページ: -
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 査読: 査読あり(内部)
 識別子(DOI, ISBNなど): eDoc: 728838
ISI: 000389780000001
 学位: -

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出版物 1

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出版物名: Frontiers in Microbiology
種別: 学術雑誌
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出版社, 出版地: -
ページ: - 巻号: 7 通巻号: 1973 開始・終了ページ: 1 - 10 識別子(ISBN, ISSN, DOIなど): ISSN: 1664-302X