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. Linoleic acid is the preferred substrate, but is also active with linolenic and arachidonic acids. (9Z,12Z)-octadecadienoate + O2 = (9S)-hydroperoxy-(10E,12Z)-octadecadienoate Binds 1 Fe cation per subunit. Iron is tightly bound. Optimum pH is 6.0. Lipid metabolism; oxylipin biosynthesis. Monomer. Highly expressed in tubers and roots. Detected in flower buds and leaves. Expressed in stolons and increases during early stages of tuber development. Up-regulated in roots 2 hours after jasmonate treatment and 24 hours after wounding. Not induced in the leaves. Belongs to the lipoxygenase family.