Inhibition of electron transport at the cytochrome b6f complex protects photosystem II from photoinhibition

A. Krieger-Liszkay, K. Kienzler, G. N. Johnson

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Photoinhibition of photosystem II (PS II) activity was studied in thylakoid membranes illuminated in the presence of the inhibitor of the cytochrome b6f complex 2'iodo-6-isopropyl-3-methyl-2',4,4'-trinitrodiphenylether (DNP-INT). DNP-INT was found to decrease photoinhibition. In the absence of DNP-INT, anaerobosis, superoxide dismutase and catalase protected against photoinhibition. No effect of these treatments was observed in the presence of DNP-INT. These data demonstrate that photoinhibition under these conditions is caused by reactive oxygen species which are formed most probably by the reduction of oxygen at photosystem I. The results are discussed in terms of the importance of photosynthetic control in protection against photoinhibition in vivo. Copyright (C) 2000 Federation of European Biochemical Societies.
    Original languageEnglish
    Pages (from-to)191-194
    Number of pages3
    JournalFEBS Letters
    Volume486
    Issue number3
    DOIs
    Publication statusPublished - 15 Dec 2000

    Keywords

    • 2'Iodo-6-isopropyl-3-methyl-2',4,4'-trinitrodiphenylether
    • Photoinhibition
    • Reactive oxygen species

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