Root pressure
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Root pressure is the transverse osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves.
Primary and secondary roots in a cotton plant
Guttation
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Guttation is the exudation of drops of internal liquid out of the tips or edges of leaves of some vascular plants, and also a number of fungi. Ancient Latin gutta means "a drop of fluid", whence moder
Root pressure
…is high, xylem sap is usually under tension, rather than under pressure, due to transpirational pull. At night in some plants, root pressure causes guttation or exudation of drops of xylem sap from the tips or edges of leaves. Root pressure is studied by removing the shoot of a plant near the soil level…
Guttation on Equisetum sp.
Crimson guttation droplets on the tooth fungus, Hydnellum peckii
Guttation on a strawberry leaf
Guttation on a prayer plant