Figure 1. The 9-LOX metabolism of linolenic acid in response to AM fungal colonization in tomato roots. LOXA and AOS3 are induced when the AM colonization is well-established in roots. OPDA (a mixture of 10- and 12-OPDA) increased in response to AM colonization at this stage. The role of DES is controversial and its induction no dependent directly on the degree of colonization. The role of HPL and ketols are not known during AM colonization. LOX, lipoxygenase; AOS, allene oxide synthase; DES, divinyl ether synthase; HPL, hydroperoxide lyase; 9-HPOT, 9-hydroperoxy linolenic acid; 9–10-EOT, 9–10-epoxy octadecatrienoic acid; 10-OPDA, 10-oxo phytodienoic acid.