cuy ot water w
thic above example the call sap OP equals to the solute OR, the pressure of the cells or their wall pressure.The DPD of the cell is a quantity like OP and TP and be expressed in Dynamics of the Osmotic Movement of Water in Plants
In order to simplify this dynamies, changes in the osmotic
pressure of the cell sap resulting from volume changes into the cells, as shown in the mentioned diagram will be disregarded as usually there are not great enough to modify seriously any generalized picture of the water relations of plant cells.Accordingly water will move (by diffusion) from cell to cell according to the gradual increase in the OP of cell sap, in other words from cell with lower OP to that of higher OP.
However, in the movement of water from cell to cell in plants, it is the diffusion-pressure deficits and not osmotic pressures which tend to equilibrate water movement, this is only a special aspect of the fundamental tendency of the diffusion-pressure of water to attain a uniform value throughout any system.23 When the DPD of lyo adjacent cells are dissimilar (and this naturally occur), a DID gradient exists between them Movement water from one cell to another can occur only whch such a gradient excises.Other conditions being equal the steeper this gradient, i.e. the greater the difference in DDs, the more rapidly one cell gains water from the other.atmospheres.