Enzymes involved in the precursor biosynthesis for mono-(C10), sesqui-(C15) and di-(C20) terpenes . An explanation of the abbreviations used in the pathways and the GAII reads for each enzyme are shown in Tables 4 and 5, respectively. ER; endoplasmic reticulum, TPS; terpene synthase, SPS; solanesyl diphosphate synthase. The grey oval circles between organelles and at the cell membrane represent putative transporter systems. Peroxisomal localization of precursor enzymes of the MVA pathway has been previously reported in Arabidopsis thaliana and Catharanthus roseus[42–44].