Mostly expressed in young floral buds, flowers and roots, and, to a later extent, in stems and leaves. Circadian-regulated, with a peak in expression just before the light period in short day conditions. Belongs to the glycosyl hydrolase 14 family. In contrast to other members of the family, lacks the conserved Glu active site in position 449, which is replaced by a Gln residue, suggesting it is inactive.