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The PSI-H subunit of photosystem I is essential for state transitions in plant photosynthesis

Author

Listed:
  • Christina Lunde

    (Plant Biochemistry Laboratory, The Royal Veterinary and Agricultural University)

  • Poul Erik Jensen

    (Plant Biochemistry Laboratory, The Royal Veterinary and Agricultural University)

  • Anna Haldrup

    (Plant Biochemistry Laboratory, The Royal Veterinary and Agricultural University)

  • Juergen Knoetzel

    (Plant Biochemistry Laboratory, The Royal Veterinary and Agricultural University)

  • Henrik Vibe Scheller

    (Plant Biochemistry Laboratory, The Royal Veterinary and Agricultural University)

Abstract

Photosynthesis in plants involves two photosystems responsible for converting light energy into redox processes. The photosystems, PSI and PSII, operate largely in series, and therefore their excitation must be balanced in order to optimize photosynthetic performance1. When plants are exposed to illumination favouring either PSII or PSI they can redistribute excitation towards the light-limited photosystem. Long-term changes in illumination lead to changes in photosystem stoichiometry2,3. In contrast, state transition is a dynamic mechanism that enables plants to respond rapidly to changes in illumination. When PSII is favoured (state 2), the redox conditions in the thylakoids change and result in activation of a protein kinase4,5,6. The kinase phosphorylates the main light-harvesting complex (LHCII) and the mobile antenna complex is detached from PSII. It has not been clear if attachment of LHCII to PSI in state 2 is important in state transitions. Here we show that in the absence of a specific PSI subunit, PSI-H, LHCII cannot transfer energy to PSI, and state transitions are impaired.

Suggested Citation

  • Christina Lunde & Poul Erik Jensen & Anna Haldrup & Juergen Knoetzel & Henrik Vibe Scheller, 2000. "The PSI-H subunit of photosystem I is essential for state transitions in plant photosynthesis," Nature, Nature, vol. 408(6812), pages 613-615, November.
    • Handle: RePEc:nat:nature:v:408:y:2000:i:6812:d:10.1038_35046121
    DOI: 10.1038/35046121
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    Cited by:

    1. Yulei Zhang & Dong Chen & Ning Zhang & Feng Li & Xiaoxia Luo & Qianru Li & Changling Li & Xianghu Huang, 2021. "Transcriptional Analysis of Microcystis aeruginosa Co-Cultured with Algicidal Bacteria Brevibacillus laterosporus," IJERPH, MDPI, vol. 18(16), pages 1-14, August.
    2. Xiuxiu Li & Guoqiang Huang & Lixia Zhu & Chenyang Hao & Sen-Fang Sui & Xiaochun Qin, 2024. "Structure of the red-shifted Fittonia albivenis photosystem I," Nature Communications, Nature, vol. 15(1), pages 1-14, December.

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