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. Is involved in pollen tube growth regulation through its interaction with ARAC11/ROP1. Interacts with ARAC11/ROP1. Expressed in roots, leaves, stems, flowers, siliques and pollen. Over-expression of RIC2 in tobacco germinating pollen reduces pollen tube elongation. Extended N-terminus.