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Plos One : Quality Control of Photosystem II ; Lipid Peroxidation Accelerates Photoinhibition Under Excessive Illumination, Volume 7

By Subramanyam, Rajagopal

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Book Id: WPLBN0003958955
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos One : Quality Control of Photosystem II ; Lipid Peroxidation Accelerates Photoinhibition Under Excessive Illumination, Volume 7  
Author: Subramanyam, Rajagopal
Volume: Volume 7
Language: English
Subject: Journals, Science, Medical Science
Collections: Periodicals: Journal and Magazine Collection
Historic
Publication Date:
Publisher: Plos

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Subramanyam, R. (n.d.). Plos One : Quality Control of Photosystem II ; Lipid Peroxidation Accelerates Photoinhibition Under Excessive Illumination, Volume 7. Retrieved from http://www.ebooklibrary.org/


Description
Description : Environmental stresses lower the efficiency of photosynthesis and sometimes cause irreversible damage to plant functions. When spinach thylakoids and Photosystem II membranes were illuminated with excessive visible light (100–1,000 mmol photons m21 s21) for 10 min at either 20uC or 30uC, the optimum quantum yield of Photosystem II decreased as the light intensity and temperature increased. Reactive oxygen species and endogenous cationic radicals produced through a photochemical reaction at and/or near the reaction center have been implicated in the damage to the D1 protein. Here we present evidence that lipid peroxidation induced by the illumination is involved in the damage to the D1 protein and the subunits of the light-harvesting complex of Photosystem II. This is reasoned from the results that considerable lipid peroxidation occurred in the thylakoids in the light, and that lipoxygenase externally added in the dark induced inhibition of Photosystem II activity in the thylakoids, production of singlet oxygen, which was monitored by electron paramagnetic resonance spin trapping, and damage to the D1 protein, in parallel with lipid peroxidation. Modification of the subunits of the light-harvesting complex of Photosystem II by malondialdehyde as well as oxidation of the subunits was also observed. We suggest that mainly singlet oxygen formed through lipid peroxidation under light stress participates in damaging the Photosystem II subunits.

 

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