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Formation of oxidized phosphatidylinositol and 12-oxo-phytodienoic acid containing acylated phosphatidylglycerol during the hypersensitive response in Arabidopsis

Journal article
Authors Anders K. Nilsson
Oskar N. Johansson
Per Fahlberg
Feray Steinhart
Mikael Gustavsson
Mats Ellerström
Mats X. Andersson
Published in Phytochemistry
Volume 101
Pages 65-75
ISSN 0031-9422
Publication year 2014
Published at Department of Biological and Environmental Sciences
Pages 65-75
Language en
Links dx.doi.org/10.1016/j.phytochem.2014...
https://gup.ub.gu.se/file/140444
Keywords Membrane lipid, Arabidopside, Hypersensitive response, 12-Oxo-phytodienoic acid, Lipid profiling, TANDEM MASS-SPECTROMETRY, PHOSPHATIDIC-ACID, MEMBRANE-LIPIDS, DISEASE, RESISTANCE, STRESS RESPONSES, TOBACCO-LEAVES, CELL-DEATH, THALIANA, GALACTOLIPIDS, HYDROPEROXIDES
Subject categories Biochemistry

Abstract

Plant membranes are composed of a wide array of polar lipids. The functionality of these extends far beyond a pure structural role. Membrane lipids function as enzyme co-factors, establish organelle identity and as substrates for enzymes such as lipases and lipoxygenases. Enzymatic degradation or oxidation (enzymatic or non-enzymatic) of membrane lipids leads to the formation of a diverse group of bioactive compounds. Plant defense reactions provoked by pathogenic microorganisms are often associated with substantial modifications of the lipidome. In this study, we profiled changes in phospholipids during the hypersensitive response triggered by recognition of the bacterial effector protein AvrRpm1 in Arabidopsis thaliana. A simple and robust LC-MS based method for profiling plant lipids was designed to separate all the major species of glycerolipids extracted from Arabidopsis leaf tissue. The method efficiently separated several isobaric and near isobaric lipid species, which otherwise are difficult to quantify in direct infusion based profiling. In addition to the previously reported OPDA-containing galactolipids found to be induced during hypersensitive response in Arabidopsis, three OPDA-containing sulfoquinovosyl diacylglycerol species, one phosphatidylinositol species as well as two acylated OPDA-containing phosphatidylglycerol species were found to accumulate during the hypersensitive response in Arabidopsis. Our study confirms and extends on the notion that the hypersensitive response in Arabidopsis triggers a unique profile of Allene Oxide Synthase dependent oxidation of membrane lipids. Primary targets of this oxidation seem to be uncharged and anionic lipid species. (C) 2014 Elsevier Ltd. All rights reserved.

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