Cytochrome P450 of the CYP74B subfamily involved in the biosynthesis of traumatin and C6 aldehydes (PubMed:10923789, PubMed:10859201). Metabolizes 13- but not 9-hydroperoxides of linoleic and linolenic acids (PubMed:10923789, PubMed:10859201). Can use 15S-hydroperoxy-11(Z),13(E),17(Z)-eicosatrienoic acid (15-HPET) and 13S-hydroperoxy-9(Z),11(E),15(Z)-octadecatrienoic acid (13-HPOT) as substrates, but only 5% activity with 13S-hydroperoxy-9(Z),11(E)-octadecadienoic acid (13-HPOD) (PubMed:10859201). Produces n-hexanal and 12-oxo-9(Z)-dodecanoic acid from 13-HPOD (PubMed:10923789). Reversibly inhibited by nordihydroguaiaretic acid (NDGA) and irreversibly by salicylic acid. Optimum pH is 6.0. Highly expressed in developing flowers and in young leaves. Detected in stems and immature green fruits, but not in mature green and red fruits. Up-regulated by wounding. Belongs to the cytochrome P450 family.