Changes in P-700 oxidation during the early stages of the induction of photosynthesis

J. Harbinson*, C.L. Hedley

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    64 Citations (Scopus)

    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 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.
    Original languageEnglish
    Pages (from-to)649-660
    JournalPlant Physiology
    Volume103
    Issue number2
    DOIs
    Publication statusPublished - Oct 1993

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