Possible role in the continued mobilization of sucrose to sink organs. Hydrolysis of terminal non-reducing beta-D-fructofuranoside residues in beta-D-fructofuranosides. Glycan biosynthesis; sucrose metabolism. Present in two forms, a 70 kDa monomer and a heterodimer of the 30 kDa and 38 kDa subunits. The ratio of the levels of the two forms within cells appears to be regulated developmentally. May be released into the lumen of the vacuole from the tonoplast through a proteolytic processing. Appears after germination and maintained at high levels in rapidly growing tissues. Regulation of synthesis appears to be related to the growth of seedlings. Belongs to the glycosyl hydrolase 32 family.