Functions as downstream effector of Rho-related GTP binding proteins of the 'Rho of Plants' (ROPs) family. Participates in the propagation of ROP GTPase signals in specific cellular responses. Functions as downstream effector of active ARAC4/ROP2 GTPase which is involved in the prevention of excessive stomatal opening upon light stimulation. Is involved in pollen tube growth regulation through its interaction with ARAC11/ROP1. Interacts with ARAC4/ROP2 and ARAC11/ROP1. In guard cells in the dark localizes predominantly in the nucleus, but upon light irradiation, it is found at the plasma membrane and in the cytoplasm. Expressed in roots, leaves, guard cells, stems, flowers, siliques and pollen. Over-expression of RIC7 in tobacco germinating pollen reduces pollen tube elongation.