Abstract
The light-dependent rate of photosystem-II (PSII) damage and repair was measured in photoautotrophic cultures of Dunaliella salina Teod. grown at different irradiances in the range 50–3000 μmol photons · m−2· s−1. Rates of cell growth increased in the range of 50–800 μmol photons·m−2·s−1, remained constant at a maximum in the range of 800–1,500 μmol photons·m−2 ·s−1, and declined due to photoinhibition in the range of 1500–3000 μmol photons·m−2·s−1. Western blot analyses, upon addition of lincomycin to the cultures, revealed first-order kinetics for the loss of the PSII reaction-center protein (D1) from the 32-kDa position, occurring as a result of photodamage. The rate constant of this 32-kDa protein loss was a linear function of cell growth irradiance. In the presence of lincomycin, loss of the other PSII reaction-center protein (D2) from the 34-kDa position was also observed, occurring with kinetics similar to those of the 32-kDa form of D1. Increasing rates of photodamage as a function of irradiance were accompanied by an increase in the steady-state level of a higher-molecular-weight protein complex (≈ 160-kDa) that cross-reacted with D1 antibodies. The steady-state level of the 160-kDa complex in thylakoids was also a linear function of cell growth irradiance. These observations suggest that photodamage to D1 converts stoichiometric amounts of D1 and D2 (i.e., the D1/D2 heterodimer) into a ≈160-kDa complex. This complex may help to stabilize the reaction-center proteins until degradation and replacement of D1 can occur. The results indicated an intrinsic half-time of about 60 min for the repair of individual PSII units, supporting the idea that degradation of D1 after photodamage is the rate-limiting step in the PSII repair process.
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Abbreviations
- Chl:
-
chlorophyll
- PSI:
-
photosystem I
- PSII:
-
photosystem II
- D1:
-
the 32-kDa reaction-center protein of PSII, encoded by the chloroplast psbA gene
- D2:
-
the 34-kDa reactioncenter protein of PSII, encoded by the chloroplast psbD gene
- QA :
-
primary electron-accepting plastoquinone of PSII
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The work was supported by grant 94-37100-7529 from the US Department of Agriculture, National Research Initiative Competitive Grants Program.
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Baroli, I., Melis, A. Photoinhibition and repair in Dunaliella salina acclimated to different growth irradiances. Planta 198, 640–646 (1996). https://doi.org/10.1007/BF00262653
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DOI: https://doi.org/10.1007/BF00262653