Mitochondrial invertase that cleaves sucrose into glucose and fructose and is involved in the regulation of aerial tissue development and floral transition. May be modulating hormone balance in relation to the radicle emergence. Hydrolysis of terminal non-reducing beta-D-fructofuranoside residues in beta-D-fructofuranosides. Optimum pH is 6.0. Expressed in seedlings, roots and flowers. Delayed germination time, reduced plant growth, delayed flowering and reduced oxygen consumption in the dark. Belongs to the glycosyl hydrolase 100 family. Truncated N-terminus.