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Light adaptation of cyclic electron transport through Photosystem I in the cyanobacterium Synechococcus sp. PCC 7942

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Abstract

Photosystem I-driven cyclic electron transport was measured in intact cells of Synechococcus sp PCC 7942 grown under different light intensities using photoacoustic and spectroscopic methods. The light-saturated capacity for PS I cyclic electron transport increased relative to chlorophyll concentration, PS I concentration, and linear electron transport capacity as growth light intensity was raised. In cells grown under moderate to high light intensity, PS I cyclic electron transport was nearly insensitive to methyl viologen, indicating that the cyclic electron supply to PS I derived almost exclusively from a thylakoid dehydrogenase. In cells grown under low light intensity, PS I cyclic electron transport was partially inhibited by methyl viologen, indicating that part of the cyclic electron supply to PS I derived directly from ferredoxin. It is proposed that the increased PSI cyclic electron transport observed in cells grown under high light intensity is a response to chronic photoinhibition.

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Abbreviations

DBMIB:

2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone

DCMU:

3-(3,4-dichlorophenyl)-1,1-dimethylurea

ES:

energy storage

MV:

methyl viologen

PAm :

photoacoustic thermal signal with strong non-modulated background light added

PAs :

photoacoustic thermal signal without background light added

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Authors and Affiliations

  1. Department of Biological Sciences, University of Idaho, 83844-3051, Moscow, ID, USA

    Stephen K. Herbert & Rick E. Martin

  2. Department of Plant Biology, Carnegie Institution of Washington, 290 Panama St., 94305, Stanford, CA, USA

    David C. Fork

Authors
  1. Stephen K. Herbert
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  2. Rick E. Martin
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  3. David C. Fork
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CIW/DPB Publication No. 1205.

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Herbert, S.K., Martin, R.E. & Fork, D.C. Light adaptation of cyclic electron transport through Photosystem I in the cyanobacterium Synechococcus sp. PCC 7942. Photosynth Res 46, 277–285 (1995). https://doi.org/10.1007/BF00020441

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  • DOI: https://doi.org/10.1007/BF00020441

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