Dear Santhosh Kumar,

Deformation implies the movement of crystallite parts on preferred crystallographic lattice planes or slip planes . The crystal parts shear along the slip planes in certain slip directions . The combination of a slip plane and a slip direction constitutes a slip system. This description does not need the concept of 'planar slip density'. The number of active slip systems increases with increasing temperature, e.g. due to cross slip.

Supposing that your question regards metals, deformation at the temperatures you indicated can probably taken as hot forming, i.e. low stresses yielding (nearly) instantaneous deformation above the recrystallization temperature. Again, the concept of 'planar slip density' seems unnecessary to describe the deformation at the temperatures you indicated. 

planar slip is essentially on a single (or limited) slip systems eg in basal slip in HCP at room temperature.Same HCP may give way to wavy slip on multiple slip systems at some appropriate higher temperature. 

Short range ordering at high temperature triggers planar slip.