Chromosome positions of KGM synthesis-related genes and putative biosynthetic pathway of KGM. (A) Positions of KGM synthesis-related genes distributed on chromosomes 5 and 11. (B) Putative biosynthetic pathway of KGM. Group 1, group 2 and group 3 are highlighted in green, orange and red, respectively. Dash lines represent speculative pathways. Sucrose synthase (SuS), invertase (INV), phosphoglucose isomerase (PGI), phosphoglucomutase (PGM), phosphomannose isomerase (PMI), phosphomannomutase (PMM), starch synthase (SS), GDP-mannose pyrophosphorylase (GMPP), UDP-glucose pyrophosphorylase (UGP), ADP-glucose pyrophosphorylase (AGP), fructokinase (FRK), hexokinase (HXK), starch branching enzyme (SBE), cellulose synthase-like A (CSLA), Cellulose synthase-like D (CSLD), mannan-synthesis related 1 (MSR1).