Acidic vacuolar invertase involved in light-induced bud burst (PubMed:22505690, PubMed:27083698). Hydrolysis of terminal non-reducing beta-D-fructofuranoside residues in beta-D-fructofuranosides. Optimum pH is 4.5. Monomer (PubMed:27083698). May be present in two forms, a 70 kDa monomer and a heterodimer of the 30 kDa and 38 kDa subunits (By similarity). The ratio of the levels of the two forms within cells appears to be regulated developmentally (By similarity). May be released into the lumen of the vacuole from the tonoplast through a proteolytic processing. Expressed in buds, stems, roots and leaves (PubMed:22505690). Expressed in the epidermal cells of young leaves and of primordial leaves (PubMed:25108242). Strongly up-regulated synergistically by light and sugars during bud burst (PubMed:22505690, PubMed:20374536, PubMed:25108242). Up-regulated synergistically by the combination of light and gibberellin (PubMed:25108242). Glycosylated. Belongs to the glycosyl hydrolase 32 family. On light, buds and bursts - Issue 224 of April 2020