Explanation

The difference between the diffusion pressure of the solution and its solvents at a particular temperature and atmospheric conditions is called DPD (Diffusion Pressure Deficit). DPD is also known as suction pressure. In fully turgid cells, turgor pressure is equal to osmotic pressure and hence diffusion pressure deficit becomes zero in such case. OP=TP(in turgid cell) $\therefore$ DPD= 0(zero)