"root pressure." YourDictionary, n.d. Web. 10 December 2018. <https://www.yourdictionary.com/root-pressure>.
root pressure. (n.d.). Retrieved December 10th, 2018, from https://www.yourdictionary.com/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.