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Heat-stress Stimulation of Oxygen Uptake by Photosystem I Involves the Reduction of Superoxide Radicals by Specific Electron Donors

Overview
Journal Photosynth Res
Publisher Springer
Date 2013 Dec 10
PMID 24318751
Citations 8
Authors
N Boucher
R Carpentier
Affiliations
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Abstract

A Photosystem I submembrane fraction isolated from spinach was used to study the mechanism of heat-stress stimulation of oxygen uptake by the photosystem. Various artificial electron donors were shown to generate electron transport reactions with various degrees of thermally induced stimulation. A strong stimulation was observed with durohydroquinone as electron donor with a maximal effect at 50 °C. The degree of stimulation obtained was independent from the redox potential of the electron donors and from their oxidation site because the enzyme superoxide dismutase fully inhibited the stimulation. Instead, it is proposed that thermal stress causes the release of membrane bound superoxide dismutase from the thylakoids thus allowing the reduced form of electron donors with specific properties to reduce O2 (-) radicals to H2O2 besides the usual disproportionation of O2 (-) into O2 and H2O2.

Citing Articles

Pre-Acclimation to Elevated Temperature Stabilizes the Activity of Photosystem I in Wheat Plants Exposed to an Episode of Severe Heat Stress.

Filacek A, Zivcak M, Ferroni L, Barboricova M, Gasparovic K, Yang X Plants (Basel). 2022; 11(5).

PMID: 35270085 PMC: 8912596. DOI: 10.3390/plants11050616.

Effect of artificial redox mediators on the photoinduced oxygen reduction by photosystem I complexes.

Petrova A, Mamedov M, Ivanov B, Semenov A, Kozuleva M Photosynth Res. 2018; 137(3):421-429.

PMID: 29767343 DOI: 10.1007/s11120-018-0514-z.

Heat stress-induced effects of photosystem I: an overview of structural and functional responses.

Ivanov A, Velitchkova M, Allakhverdiev S, Huner N Photosynth Res. 2017; 133(1-3):17-30.

PMID: 28391379 DOI: 10.1007/s11120-017-0383-x.

The photoproduction of superoxide radicals and the superoxide dismutase activity of Photosystem II. The possible involvement of cytochrome b559.

Ananyev G, Renger G, Wacker U, Klimov V Photosynth Res. 2013; 41(2):327-38.

PMID: 24310115 DOI: 10.1007/BF00019410.

Variable thermal dissipation in a Photosystem I submembrane fraction.

Velitehkova M, Carpentier R Photosynth Res. 2013; 40(3):263-8.

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