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

Abstract

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 COz fixation were examined in pea (Pisum sativum 1.) leaves under a range of conditions. Initially, P700 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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@inproceedings{Harbinson2002ChangesIP, title={Changes in P - 700 Oxidation during the Early Stages of the lnduction of Photosynthesis '}, author={Jeremy Harbinson}, year={2002} }