Endodermis

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Endodermis

The single layer of plant cells that is located between the cortex and the vascular (xylem and phloem) tissues. It has its most obvious development in roots and subaerial stems. The endodermis has many apparent functions: absorption of water, selection of solutes and ions, and production of oils, antibiotic phenols, and acetylenic acids.

The endodermis has been found to have extra sets of chromosomes as compared with cortical and other cells in the plant. In some plants the chromosome numbers may be so high in the endodermis that four sets of chromosomes may occur in each endodermal cell. The larger amount of nuclear material and nucleic acid in the cells of the endodermis may in part account for the great capacity of endodermal cells to produce large amounts of chemical substances, such as acetylenic oils, high in caloric energy. See Cortex (plant)

McGraw-Hill Concise Encyclopedia of Bioscience. © 2002 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Endodermis

 

the innermost single-row layer of compact parenchymatous cells of the primary cortex adjacent to the central cylinder of the axial organs of higher plants. The endodermis is not highly differentiated in stems and usually contains secondary starch. In the roots, the radial and transverse walls of the endodermal cells have bandlike thickenings containing suberin and lignin. The cells involved in the exchange of molecules remain thin-walled. Thus, the endodermis is a physiological barrier that regulates the entry of water and ions from the primary cortex to the central cylinder of the root.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

endodermis

[¦en·dō¦dər·məs]
(botany)
The innermost tissue of the cortex of most plant roots and certain stems consisting of a single layer of at least partly suberized or cutinized cells; functions to control the movement of water and other substances into and out of the stele.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The location of chlorococci in an endodermal cell also suggests the unstable symbiosis of vulgaris group hydras (e.g., J7, J10, 105G).
The hydrophobic barrier that seals the extracellular apoplastic space between neighboring endodermal cells is called the Casparian strip (shown in red).
Thus, the aggressiveness and invasive capability could be present in endodermal cells, and the ability to reactivate their potentiality in a particular organ or tissue can occur as a result of a whole range of environmental and lifestyle influences from different countries such as Brazil and the United States.
After acquiring water by the velamen, the exodermis and endodermal cells do contribute to their channeling through cortex.
Once water reaches the endodermis layer, apoplastic water must pass through endodermal membranes because of a gasketlike band of suberin around each endodermal cell. Suberin is a waterproof waxy substance that seals off the route of water between cells.
It turns out that the gene regulates the formation of a certain type of embryonic cell, called endodermal cells, which in turn help direct the development of other tissue involved in facial development.
Lingual foregut duplication cysts are believed to arise from endodermal cells that become trapped during the fusion of the lateral lingual swelling (distal tongue bud) and the tuberculum impar (median tongue bud) in the 3- to 4-mm embryo.
(12) Either developmental rests or differentiation of multipotent endodermal cells can lead to the development of ciliated cysts.
Each can induce endodermal cells to become pancreatic, says Melton.
Newly mature endodermal cells always have a casparian strip (c.s.), the narrow to broad band of suberin encircling the anticlinal (radial or transverse) cell walls.
The formation of the mesodermal germ layer requires an inductive interaction between presumptive ecto- and endodermal cells. In mollusks (van den Biggelaar and Guerrier 1979; Martindale et al.1985; Boring 1989), ectodermal cells induce one of four equivalent presumptive endodermal cells to deviate from the original endodermal fate and to produce the mesodermal stem cell from which the two mesodermal bands arise.
Presence of ectopic thyroid tissues at uncommon locations may be due to abnormal migration of heterotrophic differentiation of uncommitted endodermal cells. [6] Over descent migration of the thyroglossal duct remnants have been proposed as the possible event leading to mediastinal ectopic thyroids.