Chloride involvement in the synthesis, functioning and repair of the photosynthetic apparatus in vivo

John A. Raven (Lead / Corresponding author)

    Research output: Contribution to journalReview article

    1 Citation (Scopus)

    Abstract

    Cl- has long been known as a micronutrient for oxygenic photosynthetic resulting from its role an essential cofactor for Photosystem II (PSII). Evidence on the in vivo Cl- distribution in Spinacia oleracea leaves and chloroplasts show that sufficient Cl- is present for the involvement in PSII function, as indicated by in vitro studies on, among other organisms, S. oleracea PsII There is also sufficient Cl- to function, with K+ , of parsing the H+ electrochemical potential difference (proton motive force) across the illuminated thylakoid membrane into electrical potential difference and pH difference components. However, recent in vitro work on PSII from S. oleracea shows that oxygen evolving complex (OEC) synthesis, and re-synthesis after photodamage, requires significantly higher Cl- concentrations than satisfy the function of assembled PSII O2 evolution of the synthesised PSII with OEC. The low Cl- affinity of OEC (re-)assembly could be a component of limiting the rate of OEC (re-) assembly.

    Original languageEnglish
    Pages (from-to)334-342
    Number of pages9
    JournalNew Phytologist
    Volume227
    Issue number2
    Early online date14 Mar 2020
    DOIs
    Publication statusPublished - 19 Apr 2020

    Keywords

    • Chloride
    • oxygen evolving complex (OEC)
    • photodamage repair
    • photosystem I
    • proton motive force
    • photosystem II
    • chloride

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