Could participate in a signal transduction pathway that controls cytoskeletal organization. Inactive GDP-bound Rho GTPases reside in the cytosol, are found in a complex with Rho GDP-dissociation inhibitors (Rho GDIs), and are released from the GDI protein in order to translocate to membranes upon activation. Associated with the membrane when activated. Highly enhanced expression in developing cotton fibers, with maximal expression occurring at the time of transition between primary and secondary wall synthesis. Belongs to the small GTPase superfamily. Rho family.