? According to the structure of CCA and considering the effect of intracellular phosphate on CCA cell growth and salidroside production, a structured mathematical model was developed to describe the compact callus aggregate (CCA) suspension culture of Rhodiola sachalinensis. Five pools of compounds (intracellular phosphate, structural biomass, starch, meristic dots and salidroside) were included in this model. The results show that this model provides a good description of the CCA suspension culture syste...