The action spectrum of Photosystem II photoinactivation in visible light

Alonso Zavafer, Wah Soon Chow, Mun Hon Cheah*

*Corresponding author for this work

    Research output: Contribution to journalReview articlepeer-review

    39 Citations (Scopus)

    Abstract

    Photosynthesis is always accompanied by light induced damage to the Photosystem II (PSII) which is compensated by its subsequent repair. Photoinhibition of PSII is a complex process, balancing between photoinactivation, protective and repair mechanisms. Current understanding of photoinactivation is limited with competing hypotheses where the photosensitiser is either photosynthetic pigments or the Mn4CaO5 cluster itself, with little consensus on the mechanisms and consequences of PSII photoinactivation. The mechanism of photoinactivation should be reflected in the action spectrum of PSII photoinactivation, but there is a great diversity of the action spectra reported thus far. The only consensus is that PSII photoinactivation is greatest in the UV region of the electromagnetic spectrum. In this review, the authors revisit the methods, technical constraints and the different action spectra of PSII photoinactivation reported to date and compare them against the diverse mechanisms proposed. Upon critical examination of the reported action spectra, a hybrid mechanism of photoinactivation, sensitised by both photosynthetic pigments and the Mn4CaO5 appears to be the most plausible rationalisation.

    Original languageEnglish
    Pages (from-to)247-260
    Number of pages14
    JournalJournal of Photochemistry and Photobiology B: Biology
    Volume152
    DOIs
    Publication statusPublished - 1 Nov 2015

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