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The innermost layer of the cortex that forms a sheath around the vascular tissue of roots and some stems.


(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]


(ˌɛn doʊˈdɜr mɪs)

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]
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References in periodicals archive ?
Rhizome sections exhibit a large stele separated by a yellowish line, the endodermis from a thick cortex; numerous small, oval, vascular bundles are scattered throughout the section.
All studied species presented endodermis surrounding the vascular cylinder.
Plant roots use their endodermis, or inner skin, as a cellular gatekeeper to control the efficient use and movement of water and nutrients from the soil to the above-ground parts of the plant.
hyemale, stem stability is not turgor dependent, but is primarily attained through the arrangement of two endodermis layers and a hypodermal sterome.
On cross section of 10 days barley roots at control sample from outside to inside: root hairs, epidermis, cortex parenchyma, endodermis, pericycle, tissue conductors and medulla were observed.
purpurata are of the polyarc type and have a compound endodermis with a thick layer of cells forming an "O"-shaped passage that is lined with metaxylem poles (Figure 1A).
These results indicate that neither the presence of endodermis nor the amyloplast sedimentation is essential for hypocotyl gravitropism.
2005), the young endodermis possesses important paper meristematic, originating cellular layers of the medium portion of the cortex, which this area, with the ripening of the root, becomes an aerenchyma.
Terete, wings absent 6 Cuticle Striated 7 Trichomes covering Present, conical, unicellular 8 Glandular trichomes Present; stalk unicellular; head multicellular (4-cells) 9 Chlorenchyma Present 10 Collenchyma Present 11 Endodermis Indistinct 12 Pericyclic fibers Present 13 Phloem fibers Present in old stem only 14 Pith Often an angular hollow cells pitted in older stem Leaf structure 1 Phyllotaxy Alternate 2 Shape Linear, lower / Oblanceolate, upper elliptic 3 Size 12-38 x 5-10 mm 4 Apex Obtuse-muronate 5 Surface Hairy Midrib 1 Outline in T.
The short culms separated are composed of exodermis (bark), vascular bundle sheaths, soft tissue cells and endodermis (inner surface layers).
Hyperhomocysteinaemia may cause injury to the endodermis of the vessels, activate the platelets, improve the congregation of the platelets, enhance the production of fibrinogen, and promote migration and proliferation of smooth muscle cells.
Since all molecules, including air, should pass through the Casprian strip in the endodermis we expect far less concentration of air inside the stele and naturally none in the xylem.