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Plastid terminal oxidase acts as an alternative electron sink in a marine cyanobacterium Arthrospira sp.

  • Litao Zhang

    Litao Zhang is an Assistant Researcher in the Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, China. His study focuses on plant photosynthesis, bio-energy and micro-algal biotechnology.

    and Jianguo Liu

    Jianguo Liu is a Professor in the Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, China. His research interests include micro-algal biotechnology, cultivation and physiology of marine red algae and plant stress physiology.

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Published/Copyright: May 24, 2016

Abstract

In the marine cyanobacterium Arthrospira sp. under high light, the electron transport activity of photosystem (PS) II was much higher than the activities of PSI and the whole chain, indicating the existence of an alternative electron sink in PSII. Under high light, the addition of n-propyl gallate (PG), an inhibitor of plastid terminal oxidase (PTOX), decreased photosynthetic electron transport significantly as compared with that under low light. A significant residual level of photosynthetic electron transport remained in the presence of 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone (DBMIB) under high light. The extent of DBMIB insensitive electron transport was close to that of PG sensitive electron transport, suggesting that the PTOX acted as an alternative electron sink, accounting for 27% of total PSII electron transport in Arthrospira sp. cells under high light.

Award Identifier / Grant number: 31300330

Award Identifier / Grant number: BK2011009

Funding statement: We are grateful to the China National Nature Science Foundation (31300330) and the Key Project of Jiangsu Natural Science Foundation (BK2011009) for their financial support of this study.

About the authors

Litao Zhang

Litao Zhang is an Assistant Researcher in the Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, China. His study focuses on plant photosynthesis, bio-energy and micro-algal biotechnology.

Jianguo Liu

Jianguo Liu is a Professor in the Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, China. His research interests include micro-algal biotechnology, cultivation and physiology of marine red algae and plant stress physiology.

Acknowledgments:

We are grateful to the China National Nature Science Foundation (31300330) and the Key Project of Jiangsu Natural Science Foundation (BK2011009) for their financial support of this study.

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Received: 2016-2-16
Accepted: 2016-4-19
Published Online: 2016-5-24
Published in Print: 2016-6-1

©2016 by De Gruyter

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