Path of water across the root

Path of water across the root:

The root hairs are unicellular extensions of the roots found expanding into the pore spaces of the soil particles. The pore spaces include water and dissolved minerals in the form of soil solution. This water initially gets adsorbed to the wall of the root hair, by imbibition therefore wetting it. This forms a channel for further absorption of water by the living cells of the root in an active way. From the root hair water reaches the cells of the rhizodermis, then via the cortical layers the water reaches the passage cells of the endodermis that are opposite to the protoxylem points. The water then passes via the parenchymatous pericycle and reaches the protoxylem.

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 Figure: Path of water across the root

The path of water is in a lateral direction and therefore is termed as lateral transport of water. Once the water arrives at the xylem, it has to be transported in an upward direction to the shoot system and from there to the leaves. This is termed to as Ascent of Sap.

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