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Light-stress-related changes in the properties of photosystem I


Light-stress-related changes in photosystem I (PS I) were analyzed in photoautotrophic cultured cells of Marchantia polymorpha L. High light treatment (30␣h; 1300 μmol photons · m−2 · s−1) reduced the PS I-mediated electron-transport rate by more than 50% and the photochemical efficiency of photosystem II (PS II) by about 35%. In photoinhibited cells, 76% of the PS II centers remained closed in low light, which is in agreement with a preferential impairment of PS I. Our data indicate that excessive linear electron transport is a cause of the loss in PS I activity. Two PS I forms could be isolated by sucrose-gradient ultracentrifugation of mildly solubilized thylakoid membranes. After high-light treatment one of these forms, which showed a larger light-harvesting complex (LHC) I antenna and a specific association of LHC IIb, was enriched. The effect could be suppressed by blockage of linear electron transport. It is suggested that PS I inactivation and state transitions caused the change in PS I organisation.

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Received: 19 August 1996 / Accepted: 24 October 1996

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Herrmann, B., Kilian, R., Peter, S. et al. Light-stress-related changes in the properties of photosystem I. Planta 201, 456–462 (1997).

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  • Key words: Light-harvesting complex I
  • Light stress
  • Marchantia (cell culture)
  • Photoinhibition
  • ␣Photosystem I