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ApcD is required for state transition but not involved in blue-light induced quenching in the cyanobacterium Anabaena sp. PCC7120

  • Brief Communication/Plant Physiology
  • Published:
Chinese Science Bulletin

Abstract

Pbycobilisomes (PBS) are able to transfer absorbed energy to photosystem I and II, and the distribution of light energy between two photosystems is regulated by state transitions. In this study we show that energy transfer from PBS to photosystem I (PSI) requires ApcD. Cells were unable to perform state transitions in the absence of ApcD. The apcD mutant grows more slowly in light mainly absorbed by PBS, indicating that ApcD-dependent energy transfer to PSI is required for optimal growth under this condition. The apcD mutant showed normal blue-light induced quenching, suggesting that ApcD is not required for this process and state transitions are independent of blue-light induced quenching. Under nitrogen fixing condition, the growth rates of the wild type and the mutant were the same, indicating that energy transfer from PBS to PSI in heterocysts was not required for nitrogen fixation.

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Authors and Affiliations

  1. State Key Lab of Protein and Plant Genetic Engineering, College of Life Sciences, Peking University, Beijing, 100871, China

    ChunXia Dong & JinDong Zhao

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  1. ChunXia Dong
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  2. JinDong Zhao
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Correspondence to JinDong Zhao.

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Supported by the National Natural Science Foundation of China (Grant No. 30230040) and National High-Tech Research and Development of China (Grant No. 2007AA021405)

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Dong, C., Zhao, J. ApcD is required for state transition but not involved in blue-light induced quenching in the cyanobacterium Anabaena sp. PCC7120. Chin. Sci. Bull. 53, 3422–3424 (2008). https://doi.org/10.1007/s11434-008-0482-3

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  • DOI: https://doi.org/10.1007/s11434-008-0482-3

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