Probably involved in the biosynthesis or metabolism of oxylipin signaling molecules. In vitro, reduces cis(-)-12-oxophytodienoic acid (cis(-)-OPDA) and to cis(-)-OPC-8:0. NADP(+) + OPC-8 = (10Z,15Z)-12-oxophytodienoate + H(+) + NADPH Lipid metabolism; oxylipin biosynthesis. By wounding, jasmonate, salicylate, salt, drought and cold stresses, sucrose, copper, cadmium, mercury, UV-C, fungal elicitor and ozone. Belongs to the NADH:flavin oxidoreductase/NADH oxidase family. Truncated N-terminus.