SEE PROFILE Mats Hamberg

Metabolism of polyenoic fatty acids through the plant lipoxygenase cascade is the source of numerous oxylipins [1, 2]. Many of them are involved in plant cell signaling and plant defense. The most abundant polyenoic fatty acids of higher plants, αlinolenic and linoleic acids, are the major lipoxygenase substrates and oxylipin precursors. Many plant species which are called “16:3plants ” possess another trienoic acid, namely (7Z,10Z,13Z)hexadeca trienoic acid (16:3) [3, 4]. As reported previously, the hexadecatrienoic acid is converted in some plants through the lipoxygenase pathway into the jasmonate congener dinor12oxo10,15phytodienoic acid [5], as well as into the divinyl ether dinor(ω5Z)etherolenic acid [6]. At the same time, the regio and stereospecificity of 16:3 dioxy genation by lipoxygenases has not yet been investigated