endodermis

en·do·der·mis

E0134600 (ĕn′də-dûr′mĭs)n. The innermost layer of the cortex that forms a sheath around the vascular tissue of roots and some stems.

[endo- + (epi)dermis.]

endodermis

(ˌɛndəʊˈdɜːmɪs) n (Botany) botany the specialized innermost layer of cortex in roots and some stems, which controls the passage of water and dissolved substances between the cortex and stele[C19: from New Latin, from endo- + Greek derma skin]

en•do•der•mis

(ˌɛn doʊˈdɜr mɪs)

n. a specialized tissue in the roots and stems of vascular plants, composed of a single layer of modified parenchyma cells forming the inner boundary of the cortex. [1880–85; endo- + -dermis, extracted from epidermis]

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.

endodermis

a one-cell layer of tissue found outside the vascular areas in many ANGIOSPERMS, which is particularly important in the roots where endodermal cells are thickened with CASPARIAN STRIPS for control of water transport. Water and salts have to pass through the endodermal cells which act as a kind of valve.

单词	endodermis
释义	endodermis en·do·der·mis E0134600 (ĕn′də-dûr′mĭs)n. The innermost layer of the cortex that forms a sheath around the vascular tissue of roots and some stems. [endo- + (epi)dermis.] endodermis (ˌɛndəʊˈdɜːmɪs) n (Botany) botany the specialized innermost layer of cortex in roots and some stems, which controls the passage of water and dissolved substances between the cortex and stele[C19: from New Latin, from endo- + Greek derma skin] en•do•der•mis (ˌɛn doʊˈdɜr mɪs) n. a specialized tissue in the roots and stems of vascular plants, composed of a single layer of modified parenchyma cells forming the inner boundary of the cortex. [1880–85; endo- + -dermis, extracted from epidermis] Endodermis 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. endodermis endodermis a one-cell layer of tissue found outside the vascular areas in many ANGIOSPERMS, which is particularly important in the roots where endodermal cells are thickened with CASPARIAN STRIPS for control of water transport. Water and salts have to pass through the endodermal cells which act as a kind of valve.
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