Hierarchy amongst photosynthetic acclimation responses for plant fitness

Authors

  • Martin Frenkel,

    1. Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-901 87 Umeå, Sweden
    2. Department of Ecology and Environmental Science, University of Umeå, 901 87 Umeå, Sweden
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  • Stephane Bellafiore,

    1. Department of Molecular Biology and Department of Plant Biology, University of Geneva, 30 Quai Ernest Ansermet, 1211 Geneva 4, Switzerland
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  • Jean-David Rochaix,

    1. Department of Molecular Biology and Department of Plant Biology, University of Geneva, 30 Quai Ernest Ansermet, 1211 Geneva 4, Switzerland
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  • Stefan Jansson

    Corresponding author
    1. Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-901 87 Umeå, Sweden
      e-mail: stefan.jansson@plantphys.umu.se
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  • This work was supported by the Swedish Research Council and the Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning and by the Swiss National Foundation.

e-mail: stefan.jansson@plantphys.umu.se

Abstract

We have compared the seed production of Arabidopsis wild-type and mutant plants impaired in the regulation of the photosynthetic light reactions grown under natural conditions in the field. Mutant plants (npq4) lacking feedback de-excitation were, as previously demonstrated, severely affected in seed production. Seed sets of plants deficient in state transitions (stn7) were 19% smaller than those of wild-type plants, whereas plants missing the STN8 kinase required for the phosphorylation of the core photosystem II reaction centre polypeptides (stn8) had a normal seed production. Plants lacking both STN7 and STN8 kinases were strongly affected, indicating that these mutations act synergistically. In contrast, npq4×stn7 double mutants had the same seed set as npq4 mutants.

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