Enzymatic, but not non-enzymatic, 1O2-mediated peroxidation of polyunsaturated fatty acids forms part of the EXECUTER1-dependent stress response program in the flu mutant of Arabidopsis thaliana

The Plant Journal : for Cell and Molecular Biology
Dominika PrzybylaKlaus Apel

Abstract

The conditional flu mutant of Arabidopsis accumulates excess amounts of protochlorophyllide within plastid membranes in the dark and generates singlet oxygen upon light exposure. By varying the length of the dark period, the level of the photosensitizer protochlorophyllide may be modulated, and conditions have been established that either endorse the cytotoxicity of (1)O(2) or reveal its signaling role. Two criteria have been used to distinguish between these two modes of activity of (1)O(2): the impact of the EXECUTER1 mutation and the prevalence of either non-enzymatic or enzymatic lipid peroxidation. During illumination of etiolated flu seedlings, toxic effects of (1)O(2) prevail and non-enzymatic lipid peroxidation proceeds rapidly. In contrast, in light-grown flu plants that were subjected to an 8 h dark/light shift, lipid peroxidation occurred almost exclusively enzymatically. The resulting oxidation product, 13-hydroperoxy octadecatrienoic acid (13-HPOT), serves as a substrate for synthesis of 12-oxo phytodienoic acid (OPDA) and jasmonic acid (JA), both of which are known to control various metabolic and developmental processes in plants. Inactivation of the EXECUTER1 protein abrogates not only (1)O(2)-mediated cell deat...Continue Reading

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Citations

Jul 22, 2009·Proceedings of the National Academy of Sciences of the United States of America·Dhriti KhandalChristiane Reinbothe
Apr 25, 2012·Proceedings of the National Academy of Sciences of the United States of America·Beat B FischerKrishna K Niyogi
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Jun 11, 2015·Antioxidants & Redox Signaling·Pavel KerchevFrank Van Breusegem
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Jun 16, 2016·Proceedings of the National Academy of Sciences of the United States of America·Liangsheng WangKlaus Apel
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Dec 24, 2009·Physiologia Plantarum·Gregorio Galvez-Valdivieso, Philip M Mullineaux
Aug 12, 2009·The FEBS Journal·Christiane ReinbotheSteffen Reinbothe

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