collenchyma

col·len·chy·ma

C0480900 (kə-lĕng′kə-mə)n. A supportive tissue of plants, consisting of elongated living cells with unevenly thickened walls.

[coll(o)- + -enchyma.]

col′len·chym′a·tous (kŏl′ən-kĭm′ə-təs) adj.

collenchyma

(kəˈlɛŋkɪmə) n (Botany) a strengthening and supporting tissue in plants, consisting of elongated living cells whose walls are thickened with cellulose and pectins[C19: New Latin, from Greek kolla glue + enkhuma infusion] collenchymatous adj

col•len•chy•ma

(kəˈlɛŋ kə mə)

n. a layer of plant tissue, often of new stem growth, that consists of elongated cells thickened at the corners. [1825–35; < New Latin < Greek kóll(a) glue + énchyma content, infusion (see mesenchyme)] col•len•chym•a•tous (ˌkɒl ənˈkɪm ə təs) col•len`chy•mat′ic (-ˈmæt ɪk) adj.

Translations

collenchymeколленхима

Collenchyma

enUK

Collenchyma

A primary, or early differentiated, supporting tissue of young shoot parts appearing while these parts are still elongating. It is located near the surface, usually just under the epidermis. When observed in transverse sections, it is characterized structurally by cell walls that are intermittently thickened, generally in the corners or places of juncture of three or more cells. Collenchyma is typically formed in the petioles and vein ribs of leaves, the elongating zone of young stems, and the pedicels of flowers. See Cell walls (plant)

As in parenchyma, the cells in collenchyma are living and may contain chloroplasts and starch grains. The cell wall of a collenchyma cell is its most striking feature structurally and functionally. It is composed of cellulose and pectic compounds plus a very high proportion of water. The cytoplasm is very rich in ribosomes and ribonucleic acids in the early stages of development. Another striking feature of collenchyma cell walls is their plasticity. They are capable of great elongation during the period of growth in length of the plant. The plasticity of collenchyma is associated with a tensile strength comparable to that shown by fibers of sclerenchyma. The combination of strength and plasticity makes the collenchyma effective as a strengthening tissue in developing stems and leaves having no other supporting tissue at that time. See Epidermis (plant), Parenchyma

Collenchyma

one of the primary mechanical tissues of plants. The cells are parenchymal or elongated, with variously thickened membranes. There are angular, lamellar, and lacunar collenchymata; these variations are determined by the distribution of the thickenings in the angles of the cells (along tangential walls or near intercellular spaces). Collenchyma is found mainly in the primary cortex of young growing stems of dicotyledonous plants. Collenchyma cells are living; in a state of turgor they are stable. The cell walls consist primarily of either cellulose or cellulose and pectin. In the thicker stems of herbaceous plants, collenchyma often performs a storage or assimilative function.

collenchyma

[kə′leŋ·kə·mə] (botany) A primary, or early-differentiated, subepidermal supporting tissue in leaf petioles and vein ribs formed before vascular differentiation.

collenchyma

Fig. 116 Collenchyma . Transverse section.

collenchyma

a type of plant tissue in which the cells are similar to PARENCHYMA but are smaller and have cellulose wall thickenings in layers, particularly at the angles when seen in transverse section. Collenchyma acts as a living supporting tissue, especially in young stems and leaves.

单词	collenchyma
释义	collenchyma enUK col·len·chy·ma C0480900 (kə-lĕng′kə-mə)n. A supportive tissue of plants, consisting of elongated living cells with unevenly thickened walls. [coll(o)- + -enchyma.] col′len·chym′a·tous (kŏl′ən-kĭm′ə-təs) adj. collenchyma (kəˈlɛŋkɪmə) n (Botany) a strengthening and supporting tissue in plants, consisting of elongated living cells whose walls are thickened with cellulose and pectins[C19: New Latin, from Greek kolla glue + enkhuma infusion] collenchymatous adj col•len•chy•ma (kəˈlɛŋ kə mə) n. a layer of plant tissue, often of new stem growth, that consists of elongated cells thickened at the corners. [1825–35; < New Latin < Greek kóll(a) glue + énchyma content, infusion (see mesenchyme)] col•len•chym•a•tous (ˌkɒl ənˈkɪm ə təs) col•len`chy•mat′ic (-ˈmæt ɪk) adj. Translations collenchymeколленхима Collenchyma enUK Collenchyma A primary, or early differentiated, supporting tissue of young shoot parts appearing while these parts are still elongating. It is located near the surface, usually just under the epidermis. When observed in transverse sections, it is characterized structurally by cell walls that are intermittently thickened, generally in the corners or places of juncture of three or more cells. Collenchyma is typically formed in the petioles and vein ribs of leaves, the elongating zone of young stems, and the pedicels of flowers. See Cell walls (plant) As in parenchyma, the cells in collenchyma are living and may contain chloroplasts and starch grains. The cell wall of a collenchyma cell is its most striking feature structurally and functionally. It is composed of cellulose and pectic compounds plus a very high proportion of water. The cytoplasm is very rich in ribosomes and ribonucleic acids in the early stages of development. Another striking feature of collenchyma cell walls is their plasticity. They are capable of great elongation during the period of growth in length of the plant. The plasticity of collenchyma is associated with a tensile strength comparable to that shown by fibers of sclerenchyma. The combination of strength and plasticity makes the collenchyma effective as a strengthening tissue in developing stems and leaves having no other supporting tissue at that time. See Epidermis (plant), Parenchyma Collenchyma one of the primary mechanical tissues of plants. The cells are parenchymal or elongated, with variously thickened membranes. There are angular, lamellar, and lacunar collenchymata; these variations are determined by the distribution of the thickenings in the angles of the cells (along tangential walls or near intercellular spaces). Collenchyma is found mainly in the primary cortex of young growing stems of dicotyledonous plants. Collenchyma cells are living; in a state of turgor they are stable. The cell walls consist primarily of either cellulose or cellulose and pectin. In the thicker stems of herbaceous plants, collenchyma often performs a storage or assimilative function. collenchyma [kə′leŋ·kə·mə] (botany) A primary, or early-differentiated, subepidermal supporting tissue in leaf petioles and vein ribs formed before vascular differentiation. collenchyma enUK Fig. 116 Collenchyma . Transverse section. collenchyma a type of plant tissue in which the cells are similar to PARENCHYMA but are smaller and have cellulose wall thickenings in layers, particularly at the angles when seen in transverse section. Collenchyma acts as a living supporting tissue, especially in young stems and leaves.
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