Figure 2
The general pathway of starch biosynthesis beginning with sucrose as the product of photosynthesis. Activities are as follows. 1, sucrose synthase; 2, UDP-glucose pyrophosphorylase; 3, glycolytic enzymes including phosphoglucomutase; 4, ADPGlc pyrophosphorylase; 5, hexose phosphate transporters; 6, ADPGlc transporters.