Expressed at low levels in embryo, roots and leaves. In mature plants, expression is restricted to vascular tissues of roots, leaves, flowers and siliques. Mutant plants (Ds insertion) display reduced inflorescence height, silique number and seed yield. Belongs to the gamma-glutamyltransferase family. Could be the product of a pseudogene; it is missing regions at the N- and C-terminus compared to its paralogs.