Journal
FUNCTIONAL PLANT BIOLOGY
Volume 34, Issue 1, Pages 65-71Publisher
CSIRO PUBLISHING
DOI: 10.1071/FP06205
Keywords
hydroxy fatty acids; phytoprostanes
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The formation of non-enzymatic oxylipins is catalysed by reactive oxygen species. Reactive oxygen species are produced in response to pathogen attack. In this study, the accumulation of non-enzymatically formed hydroxy fatty acids and F-1-phytoprostanes in leaves of Arabidopsis thaliana ( L.) Heyhn upon infection with Pseudomonas syringae was investigated and compared with the accumulation of the enzymatically formed oxylipins jasmonic acid and 12-oxophytodienoic acid. Levels of all oxylipins increased after infection with a virulent and with an avirulent strain of P. syringae. Inoculation of the avirulent strain resulted in a biphasic accumulation with a first maximum around 5 h which was missing after inoculation of the virulent strain. Levels of free and esterified hydroxy fatty acids and F-1-phytoprostanes increased after pathogen treatment; however, esterified compounds were 30 times more abundant than free oxylipins. The increase of the free compounds occurred later than the increase of the esterified compounds suggesting that non-enzymatic lipid oxidation occurs predominantly in membranes from which oxidised lipids can be released.
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