mannitol as well as sucrose are well known (Table 1).
Each translocation sugar is converted to several sugars
in fruit. For example, sucrose is converted to glucose
and fructose by invertase or to fructose and UDPglucose
by sucrose synthase. Sorbitol is converted to fructose or
glucose by sorbitol dehydrogenase. Raffinose and
stachyose are converted to galactose, glucose, and
fructose by α-galactosidase and invertase. Mannitol is
converted to fructose by mannitol dehydrogenase. I will
review sucrose and sorbitol and recommend other
reviews for mannitol (Loescher and Everard, 1996) and
raffinose and stachyose (Keller and Pharr, 1996).