JA tubers contain 13–23 g dry matter (DM) per 100 g
fresh weight (FW) of which 7.4–12.0 g is inulin, and
1.6–2.2 g is fructose, glucose and sucrose making up the
total sugars (Table 12.1). The main sugar in JA tubers is
sucrose, whereas tubers contain very little fructose and
hardly any glucose (Figure 12.2A). This is true for most
of the season except for just before sprouting where a