The abbreviations for metabolites in the figure were as follows: glycerol (Gly), glucose (Glu), glucose-6-phosphate (G6P), glycerol-3-phosphate (G3P), dihydroxyacetone phosphate (DHAP), glyceraldehyde 3-phosphate (GAP), 1,3-biphospho-glycerate (G1,3P), 3-phospho-glycerate (3PG), 2-phospho-glycerate (2PG), phosphoenolpyruvate (PEP), the phosphotransferase system (PTS), pyruvate (PYR), oxaloacetate (OAA), tricarboxylic acid cycle (TCA), 1-deoxy-D-xylulose 5-phosphate (DXP), 2C-methyl-D-erythritol 4-phosphate (MEP), 4-diphosphocytidyl-2C-methyl D-erythritol (CDP-ME), 4-diphosphocytidyl-2C-methyl D-erythritol 2-phosphate (CDP-MEP), 2C-methyl-D-erythritol 2,4-diphosphate (MEC), hydroxylmethylbutenyl diphosphate (HMBPP), isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP), farnesyl pyrophosphate (FPP), geranylgeranyl pyrophosphate (GGPP), phosphate (PPi), carbohydrate phosphotransferase system (PTS). The abbreviations for enzyme-coding genes in the figure are as follows: PTS enzyme IIBC (ptsG), histidine protein (ptsH), PTS enzyme I (ptsI), PTS enzyme IIA(crr), glycerol facilitator (glpF), glycerol kinase (glpK), glycerol-3-phosphate dehydrogenase (glpK), triose phosphate isomerase (tpi), glyceraldehyde-3-phosphate dehydrogenase A (gapA), phosphoglycerate kinase (pgk), phosphoglycero mutase III (gpmM), phosphoglyceromutase I (gpmA), enolase (eno), PEP carboxylase (ppc), PEP carboxykinase (pck), phosphoenolpyruvate synthetase (ppsA), pyruvate kinase type I and II (pykFA), DXP synthase (dxs), DXP reductase (dxr), CDPME synthase (ispD), CDPME kinase (ispE), CDPMEP synthase (ispF), HMBPP synthase (ispG), HMBPP reductase (ispH), IPP isomerase (idi), farnesyl pyrophosphate (FPP) synthase (ispA), GGPP synthase (crtE), phytoene synthase (crtB) and phytoene desaturase (crtI) and amorpha-1,4-diene synthase (ADS).