Water moves through the SYMPLAST - the continuous cytoplasm of the living plant cells that is connected through the plasmodesmata - by osmosis. The root hair cell has a higher water potential then the next cell along. This is result of water diffusing in from the soil, which has made the cytoplasm more dilute. So water moves from the root hair cell into the next door cell by osmosis. This process continues until the xylem is reached.
As water leaves the root hair cell by osmosis, the water potential of the cytoplasm falls again, and this maintains a steep water potential gradient to ensure that as much water as possible continues to move into the cell from the soil.
Comments
No comments have yet been made