Photoinhibition of PSII Secondary Donors: Relevance to Photoactivation and Sites of Electron Donation

  • Danny J. Blubaugh
  • George M. Cheniae


In the absence of either a functional water-oxidizing complex or artificial PSII electron donors, the secondary donors to P680 + are susceptible to weak-light photoinhibition by a mechanism not yet established [1–3]. The ability to restore O2 evolution through the photoactivation process is also weak-light sensitive [4]. We have studied these phenomena in attempts to identify factors which prohibit complete photoactivation, to determine if D+ is specifically required in this process, and to gain some insights into the specificity of Z+ and D+ for the photooxidation of exogenous PSII donors.


Electron Donation Residual Rate Secondary Donor Forward Rate Constant Slow Loss 
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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Danny J. Blubaugh
    • 1
  • George M. Cheniae
    • 1
  1. 1.University of KentuckyLexingtonUSA

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