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Inhibition of CO2-fixation and its effect on the activity of Photosystem II, on D1-protein synthesis and phosphorylation

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Abstract

To study the effects of limitations in the Calvin-cycle on Photosystem (PS) II function and on its repair by D1-protein turnover, glycerinaldehyde (DLGA) was applied to 1 h dark-adapted pea leaves via the petiole. The application resulted in a 90% inhibition of photosynthetic oxygen evolution after 90 min illumination at either 120 or 500 µmol m−2 s−1. In the control leaves an increase of light-dependent oxygen production to 147 and 171% was observed after 90 min illumination. According to chlorophyll fluorescence quenching analysis the inhibition of photosynthetic electron transport by DLGA led to a substantial increase in the reduction state of the primary quinone acceptor of PS II, QA, and to a rise in membrane energetisation. However, PS II functionality was hardly affected by DLGA at the low light intensity as indicated by the constant high yield of variable fluorescence, Fv/Fm. Only at 500 µmol m−2 s−1 a 15% loss of Fv/Fm was observed in the presence of DLGA indicating that inactivated PS II centres had accumulated. The control leaves also showed a slight loss of Fv/Fm which did not affect photosynthetic electron transport due to a faster reoxidation of QA. The relative stability of PS II function in the presence of DLGA could not be ascribed to an increased repair by the rapid turnover of the D1-protein. Radioactive pulse-labelling studies with [14C] leucine in combination with immunological determination of the protein content revealed that both synthesis and degradation of the protein were inhibited in DLGA-treated leaves whereas in the control leaves a stimulation of D1-protein turnover was observed. The changes of D1-protein turnover could be explained by differences in the occupancy state of the QB-binding niche. A relation between the phosphorylation status of the PS II polypeptides and the turnover of the D1-protein could not be established. As shown by radioactive labelling with [32P]i, addition of DLGA led to an increase in the phosphorylation level of the PS II polypeptides D1 and D2 at the low light intensity when compared to the non-treated control. At the higher light intensity the phosphorylation level of the PS II polypeptides in control and DLGA-treated leaves were identical in spite of the substantial differences in D1-protein turnover.

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Authors and Affiliations

  1. Lehrstuhl für Biochemie der Pflanzen, Ruhr-Universität Bochum, D-44780, Bochum, Germany

    Reinhard Hollinderbäumer, Volker Ebbert & Doris Godde

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  1. Reinhard Hollinderbäumer
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  2. Volker Ebbert
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  3. Doris Godde
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Hollinderbäumer, R., Ebbert, V. & Godde, D. Inhibition of CO2-fixation and its effect on the activity of Photosystem II, on D1-protein synthesis and phosphorylation. Photosynthesis Research 52, 105–116 (1997). https://doi.org/10.1023/A:1005802623823

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