The Anion and Calcium Requirement of the Photosynthetic Water Splitting Complex

  • Peter H. Homann
  • Yorinao Inoue


Considerable evidence has accumulated which suggests that Cl and Ca2+ are essential participants in the process of photosynthetic water oxidation. However, without special treatments of membrane preparations from chloroplast thylakoids, neither anions, nor Ca2+, need to be provided to assure water oxidizing activity. Apparently, these ions are very strongly held at the water ozidizing site of the thylakoid membrane. An alternative, albeit less likely, possibility would be that a need for any one of the ions is artifactual and a consequence of a perturbation caused by the “depletion” treatment.


Water Oxidation Emission Temperature PSII Membrane Chloroplast Thylakoid Luminescence Yield 
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Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • Peter H. Homann
    • 1
  • Yorinao Inoue
    • 2
  1. 1.Institute of Molecular BiophysicsFlorida State UniversityTallahasseeUSA
  2. 2.Solar Energy Research GroupThe Institute of Physical and Chemical Research (RIKEN)Wako-shi, Saitama 351Japan

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