Cell Sap

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cell sap

[′sel ‚sap]
(cell and molecular biology)
The liquid content of a plant cell vacuole.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Cell Sap


a fluid manufactured by the cytoplasm of the living plant cell and filling the cell’s vacuoles.

Cell sap consists of water and various substances that are often in the form of a colloidal suspension. On the average, cell sap has twice the viscosity of water. In dormant seeds and spores the cell sap dehydrates, hydrating again upon germination. Young cells have less cell sap than older ones. The composition of cell sap is specific to families and even to species, depending also on growth conditions, the age of the plant, and the age of the individual cells. Cell sap contains the carbohydrates glucose, fructose, sucrose (grapes, apples, pears, sugar beets), and inulin (dahlia, Jerusalem artichoke), pectins (citrus, currants, apples), and glycosides (hesperidin, amygdalin); tannins; a number of amino acids (leucine, tyrosine); alkaloids (nicotine, anabasine, caffeine); organic acids (oxalic, citric, malic); and inorganic acids. Calcium oxalate crystals are found as inclusions. The cell sap of some marine algae contains iodine and bromine. The color of cell sap is determined by pigments: blue, violet, and red, by anthocyanins; yellow, by anthochlorins; and brown, by anthophaeinin.

The cell sap contributes to the osmotic properties and turgor of the cell and, consequently, to the elasticity of plant tissues and organs. It also serves as a receptacle for the water and various substances that participate in cell metabolism and as a place for the deposit of the end products of metabolism.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Ion concentrations in cell sap of drought-preconditioned (Pre) and non-preconditioned (Non) Kentucky bluegrass exposed to 7, 14, and 21 d of heat stress.
Among those ion solutes of cell sap, the predominant solute was [K.sup.+], which accounted for about 59 to 65% of total ion concentration.
Yoshida and her co-workers studied blue dayflowers, cornflowers, and salvia, which are blue despite the fact that the pigment cell sap of their petals is weakly acidic.
At booting stage, the highest Na+ concentration (50.3 ppm) in leaf cell sap was recorded for the control treatment followed by GA-20 (50.1 ppm), while the lowest Na+ (44.3 ppm) was recorded for HP-12 and GA-10 treatments (Table 3).
The aphids suck cell sap mostly from spikes, rolled flag leaves and cause considerable reduction in the plant vigor (Kauffman and Laroche, 1994).