Xylem sap consists primarily of water, with hormones, mineral elements and other nutrients dissolved in it. Transport of sap in xylem is generally "basipetal", or upward from the roots toward the leaves. Over the past century, there has been some controversy regarding the mechanism of xylem sap transport; today, most plant scientists agree that the bulk of the evidence supports the cohesion-tension theory.
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Xylem sap consists primarily of water, with hormones, mineral elements and other nutrients dissolved in it. Transport of sap in xylem is generally "basipetal", or upward from the roots toward the leaves. Over the past century, there has been some controversy regarding the mechanism of xylem sap transport; today, most plant scientists agree that the bulk of the evidence supports the cohesion-tension theory.
Phloem sap consists primarily of water, with sugars, hormones, and mineral elements dissolved in it. Phloem sap transport occurs from sources (locations where carbohydrates are produced or stored) toward sinks (locations where carbohydrates are utilized). The pressure flow hypothesis proposes a mechanism for phloem sap transport.
Maple syrup is made from reduced sugar maple xylem sap. In some countries (e.g., Russia, Latvia or Finland) it is common to collect the early spring sap of birch trees (so called "birch juice") for human consumption; the sap can be used fresh or fermented.
See also
- Latex
- Resin
References
- Angeles, G., B.J. Bond, J.S. Boyer, T.J. Brodribb, J.R. Brooks, M.J. Burns, J.M. Cavender-Bares, M.J. Clearwater, H. Cochard, J.P. Comstock, S.D. Davis, J.-C. Domec, L.A. Donovan, F.W. Ewers, B.L. Gartner, U.G. Hacke, T.M. Hinckley, N.M. Holbrook, H.G. Jones, K.L. Kavanagh, B.fdsafdsfa
ar:نسغ bg:Мъзга es:Savia eo:Sevo fr:Sève id:Getah lt: Sula nl:Sap (plant) pl:Sok mleczny pt:Seiva bruta sv:Sav fi:Mahla
