what is relationship between dpd osmotic potential and

water potential.

DPD: It is diffusion pressure deficit..It can be understood by its defintion. It is the deficit of diffusion pressure of water in solution as compared to a pure water.

If we consider to containers: A and B in which A has pure water and B has NaCl solution so water will move from A to B. B has a deficit therefore its water isnt able to move from B to A due to presence of solute in conatiner B.
DPD is indirectly proportional to Water potential and directly proportional to OP