root pressure

noun Botany.
osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves.

Origin:
1870–75

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American Heritage
Science Dictionary
root pressure  
Pressure produced in the roots of plants, causing exudation of sap from cut stems and guttation of water from leaves. The pressure is generated by the concentration of solutes in the xylem of the root and stem, which in turn causes water to move into the xylem by osmosis.
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Example sentences
Root growth pressure will be directly measured through the development of root pressure collars for lab and field use.
Develop root pressure system and secure reliable source of rootstock material for the greenhouse studies of hormone flux in apple.
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