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PLANT PHYSIOLOGY , Vol 103, Issue 2 649-660, Copyright © 1993 by American Society of Plant Biologists

METABOLISM AND ENZYMOLOGY

Changes in P-700 Oxidation during the Early Stages of the Induction of Photosynthesis

J. Harbinson and C. L. Hedley
ATO-DLO, Postbus 17, 6700 AA Wageningen, The Netherlands (J.H.)

Following dark adaptation, the response to irradiance of chlorophyll (Chl) fluorescence, the light-induced absorbance change around 820 nm (to measure reaction center Chl of photosystem I [PSI] P-700 oxidation), and CO2 fixation were examined in pea (Pisum sativum L.) leaves under a range of conditions. Initially, P-700 oxidation is restricted by a lack of regeneration of PSI electron acceptors, and the increase of oxidized P-700 (P-700+) that occurs during approximately the first 60 s of irradiation is largely independent of the resistance to electron flow between the two photosystems. Under these conditions, the quantum efficiency for linear electron flow is directly positively related to P-700+ accumulation, which is in contrast to the direct negative correlation that is the most frequently reported relationship between P-700+ accumulation and the quantum efficiency for linear electron flow.


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M. Hager, M. Hermann, K. Biehler, A. Krieger-Liszkay, and R. Bock
Lack of the Small Plastid-encoded PsbJ Polypeptide Results in a Defective Water-splitting Apparatus of Photosystem II, Reduced Photosystem I Levels, and Hypersensitivity to Light
J. Biol. Chem., April 12, 2002; 277(16): 14031 - 14039.
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Copyright © 1993 by the American Society of Plant Biologists