Plant lipoxygenases may be involved in a number of diverse aspects of plant physiology including growth and development, pest resistance, and senescence or responses to wounding. Catalyzes the hydroperoxidation of lipids containing a cis,cis-1,4-pentadiene structure. (9Z,12Z)-octadecadienoate + O2 = (9S)-hydroperoxy-(10E,12Z)-octadecadienoate Binds 1 Fe cation per subunit. Iron is tightly bound. Lipid metabolism; oxylipin biosynthesis. Monomer. Expressed in tubers. Detected in sprouts and flowers. but not in leaves or stems. Up-regulated by pathogen infection, and by jasmonate or arachidonate treatments. No induction by linoleic acid. Belongs to the lipoxygenase family.