Protein transport. Probably involved in vesicular traffic (By similarity). Its expression is weak in leaves, higher in stems and roots, but highest in petals, stigma and stamens. Belongs to the small GTPase superfamily. Rab family. This sequence does not have the CYS-CYS motif at the C-terminal as do homologous sequences from yeast species. It may be either geranylgeranylated at an alternative motif or it may be subject to farnesylation on CYS-215.