Free fatty acids and methyl jasmonate trigger defense reactions in Laminaria digitata

Frithjof C. Kuepper, Emmanuel Gaquerel, Audrey Cosse, Fadi Adas, Akira F. Peters, Dieter G. Mueller, Bernard Kloareg, Jean-Pierre Salauen, Philippe Potin

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90 Citations (Scopus)


Arachidonic acid, linolenic acid and methyl jasmonate (MeJA) were found to be strong triggers of an oxidative burst in the kelp Laminaria digitata. These findings constitute the first report of an oxidative burst in an algal system induced by free fatty acids. The source of reactive oxygen species can be at least partially inhibited by diphenylene iodonium (DPI). Treatment with arachidonic acid increases the levels of a number of free fatty acids [including myristic (C14:0), linoleic (C18:2), linolenic (C18:3) and eicosapentaeneoic (C20:5) acids] and hydroxylated derivatives [such as 15-hydroxyeicosate-traenoic acid (15-HETE), 13-hydroxyoctadecatrienoic acid (13-HOTE) and 15-hydroxyeicosapentaenoic acid (15-HEPE)]. Similar to a previous report of the function of an alginate oligosaccharide-triggered oxidative burst in the establishment of resistance in L. digitata against infection by its brown algal endophyte Laminariocolax tomentosoides, C20:4- and MeJA-induced oxidative bursts seem to be involved in establishing the same protection in L. digitata. Altogether, this study supports the notion that lipid oxidation signaling plays a key role in defense induction in marine brown algae.

Original languageEnglish
Pages (from-to)789-800
Number of pages12
JournalPlant and cell physiology
Issue number4
Early online date11 Feb 2009
Publication statusPublished - Apr 2009


  • archidonic acid
  • endophyte
  • laminariocolax
  • linolenic acid
  • methyl jasmonate
  • oxidative burst
  • polyinsaturated fatty acids
  • resistance


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