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)

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.

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.
References in periodicals archive ?
All tests for the presence of suberin were negative for the inner or outer cortex, but the overall result was positive for the endodermis, because of the presence of the Casparian bands.
endodermises endodermis around each vascular bundle (individual endodermises)" Sheath teeth "mostly ".
sativa roots were inhibited strongly, transverse growth was maintained regularly and was from outside to inside: root hairs, epidermis, cortex parenchyma, endodermis, pericycle, tissue conductors and parenchyma medulla.
2002), the pericycle of some Eriocaulaceae is also interrupted by protoxylem elements, which arrive until the endodermis.
From the endodermis, the lungs, thymus, liver, stomach, and pancreas eventually arise.
The last layer of the cortex, characterized by small-sized and thin walls cells surrounding the central cylinder represents endodermis, that the casparian strip is not clear in it.
They report that the monocot cambium can originate both inside and outside of the endodermis in roots of Dracaena, even within a single section.
1996; Lariguet and Fankhauser, 2004), where phytochrome is found to promote the conversion of amyloplasts to other forms of plastids in the endodermis, causing cessation of hypocotyl gravitropism (Kim et al.
Expressing this mutant form, gai, in only one tissue, the endodermis (the innermost layer of the root cortex of a plant), was sufficient to stop the meristem enlarging.
In Arabidopsis, among its many functions SCR is essential the maintenance of root meristem, the development of root and shoot endodermis and for normal shoot gravitropism.
Occurrence of endodermis with a casparian strip in stem and leaf.