Fig. 3: Volatile terpenoid (TP) biosynthesis in MeJA-primed fresh tea leaves.

Terpenoid volatile organic compounds are synthesized by the cytosolic mevalonic acid (MVA) and plastidial methylerythritol phosphate (MEP) pathways. Differentially expressed enzymes and metabolites were integrated into pathway-based maps. Mono-, sesqui-, and diterpenes are shown in the pink dashed box, and glycosidically bound derivatives are shown in the blue dashed box. Carotenoids and their derivatives were also derived through the pathway and map shown in the next figure. Cross-talk between both pathways is facilitated by the export of isopentenyl pyrophosphate (IPP) from the plastid to the cytosol. TPs terpenoids, CDP-ME 4-(cytidine 5′-diphospho)-2-C-methyl-D-erythritol, MEcDP 2-C-methyl-D-erythritol 2,4-cyclodiphosphate, IPP isopentenyl pyrophosphate, DMAPP dimethylallyl pyrophosphate, GPP geranyl diphosphate, FPP farnesyl diphosphate, GGPP geranyl geranyl diphosphate, DXS 1-deoxy-D-xylulose-5-phosphate synthase, DXR 1-deoxy-D-xylulose 5-phosphate reductoisomerase, atoB acetyl-CoA C-acetyltransferase, mvaK2 phosphomevalonate kinase, MVD diphosphomevalonate decarboxylase, ispE 4-diphosphocytidyl-2-C-methyl-D-erythritol kinase, ispF 2-C-methyl-D-erythritol 2,4-cyclodiphosphate synthase, ispG (E)-4-hydroxy-3-methylbut-2-enyl-diphosphate synthase, ispH 4-hydroxy-3-methylbut-2-enyl diphosphate reductase, GPS geranyl diphosphate synthase, FPS farnesyl diphosphate synthase, GGPS geranyl geranyl diphosphate synthase, FOLK farnesol kinase