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

Autor: Raven JA; Division of Plant Sciences, University of Dundee at the James Hutton Institute, Invergowrie, Dundee, DD2 5DA, UK.; Climate Change Cluster, University of Technology, Ultimo, Sydney, NSW, 2007, Australia.; School of Biological Science, University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia.
Jazyk: angličtina
Zdroj: The New phytologist [New Phytol] 2020 Jul; Vol. 227 (2), pp. 334-342. Date of Electronic Publication: 2020 Apr 19.
DOI: 10.1111/nph.16541
Abstrakt: 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 shows 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 + , in 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 resynthesis after photodamage, requires significantly higher Cl - concentrations than would satisfy the function of assembled PSII O 2 evolution of the synthesised PSII with the OEC. The low Cl - affinity of OEC (re-)assembly could be a component limiting the rate of OEC (re-)assembly.
(© 2020 The Author. New Phytologist © 2020 New Phytologist Trust.)
Databáze: MEDLINE
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