What is diffusion pressure deficit (DPD) - Biology - Transport in Plants

Question

What is diffusion pressure deficit? (DPD)

Shivali · Accepted Answer

To understand the diffusion
pressure deficit, first understand the terms osmotic pressure and
turgor pressure
Osmotic pressure is the pressure required to prevent solvent
from passing through a semipermeable membrane from a region of
higher concentration of solute to a region of lower concentration
of solute
Turgor pressure is the pressure of the cell contents against the
cell wall in plant cells In hypotonic solution, water
diffuses into the cell and cells enlarge and extension growth
occurs As water diffuses in, cytoplasm builds up a pressure against
the cell wall This pressure is called turgor pressure 
Diffusion pressure deficit is the pressure which opposes the
diffusion of water from the region of higher chemical potential to lower chemical potential The
two factors which determine the DPD are Osmotic pressure and the
turgor pressure It can be represented by a relation DPD = OP-wall
pressure( turgor pressure)