This suggests that sucrose in the OPT sap was decomposed to the two sugars at this period as sucrose is a disaccharide composed of glucose and fructose. However, the figures clearly showed that the increase of glucose and fructose exceeded the loss of sucrose at 30 and 60 days of storage. The sum of concentrations of three main sugars in the OPT sap was presented in Fig. 6. The changing pattern during the storage shown here is almost identical with