sclerenchyma

scle·ren·chy·ma

S0150800 (sklə-rĕng′kə-mə)n. A supportive plant tissue that consists of thick-walled, usually lignified cells. Sclerenchyma cells are either fibers or sclereids.

scle′ren·chym′a·tous (sklîr′ən-kĭm′ə-təs, -kī′mə-) adj.

sclerenchyma

(sklɪəˈrɛŋkɪmə) n (Botany) a supporting tissue in plants consisting of dead cells with very thick lignified walls[C19: from sclero- + parenchyma] sclerenchymatous adj

scle•ren•chy•ma

(sklɪˈrɛŋ kə mə)

n. supporting or protective plant tissue composed of thickened and hardened cells. [1860–65; scler- + (par) enchyma] scle•ren•chym•a•tous (ˌsklɪər ɛŋˈkɪm ə təs, ˌsklɛr-) adj.

Sclerenchyma

enUK

Sclerenchyma

Single cells or aggregates of cells whose principal function is thought to be mechanical support of plants or plant parts. Sclerenchyma cells have thick secondary walls and may or may not remain alive when mature. They vary greatly in form and are of widespread occurrence in vascular plants. Two general types, sclereids and fibers, are widely recognized, but since these intergrade, the distinction is sometimes arbitrary.

Sclerenchyma

in plants, mechanical tissue consisting of two types of thick-walled and usually woody cells: fibers and sclereids.

The fibers are greatly elongated cells, usually ranging in length from fractions of an mm to 1 cm (nettles). Some plants, for example, the ramie, have fibers reaching 4 cm in length. The fibers have sharp ends and porous layered walls. Nonwoody fibers of sclerenchyma having cellulose walls, for example, in flax, are a valuable raw material for the textile industry. Sclerenchyma fibers are as durable as steel and as resilient and elastic as rubber. The amount and distribution of the fibers determine a plant organ’s durability when subjected to stretching, compression, and bending.

In many plants the fibers form a mechanical facing for the vascular bundles. In the stems of dicotyledons they are found mainly in the pericycle and the primary phloem. In the stems and leaves of monocotyledons the fibers often form subepidermal cords, whereas in the roots they are concentrated primarily in the center. In addition to fibers of first derivation formed from the cells of the basic meristem and procambium, the term “sclerenchyma” is also applied to phloem and xylem (libriform) fibers of cambial origin.

For information on sclereids see.

L. I. LOTOVA

sclerenchyma

[sklə′reŋ·kə·mə] (botany) A supporting plant tissue composed principally of sclereids whose walls are often mineralized.

sclerenchyma

a plant tissue in which the cells have greatly thickened walls impregnated with LIGNIN, and no cell contents. The tissue has the mechanical function of supporting the plant, and consists of two types of cells: fibres and SCLEREIDS. fibres are long cells with tapered ends, which are often grouped into bundles.

单词	sclerenchyma
释义	sclerenchyma enUK scle·ren·chy·ma S0150800 (sklə-rĕng′kə-mə)n. A supportive plant tissue that consists of thick-walled, usually lignified cells. Sclerenchyma cells are either fibers or sclereids. scle′ren·chym′a·tous (sklîr′ən-kĭm′ə-təs, -kī′mə-) adj. sclerenchyma (sklɪəˈrɛŋkɪmə) n (Botany) a supporting tissue in plants consisting of dead cells with very thick lignified walls[C19: from sclero- + parenchyma] sclerenchymatous adj scle•ren•chy•ma (sklɪˈrɛŋ kə mə) n. supporting or protective plant tissue composed of thickened and hardened cells. [1860–65; scler- + (par) enchyma] scle•ren•chym•a•tous (ˌsklɪər ɛŋˈkɪm ə təs, ˌsklɛr-) adj. Sclerenchyma enUK Sclerenchyma Single cells or aggregates of cells whose principal function is thought to be mechanical support of plants or plant parts. Sclerenchyma cells have thick secondary walls and may or may not remain alive when mature. They vary greatly in form and are of widespread occurrence in vascular plants. Two general types, sclereids and fibers, are widely recognized, but since these intergrade, the distinction is sometimes arbitrary. Sclerenchyma in plants, mechanical tissue consisting of two types of thick-walled and usually woody cells: fibers and sclereids. The fibers are greatly elongated cells, usually ranging in length from fractions of an mm to 1 cm (nettles). Some plants, for example, the ramie, have fibers reaching 4 cm in length. The fibers have sharp ends and porous layered walls. Nonwoody fibers of sclerenchyma having cellulose walls, for example, in flax, are a valuable raw material for the textile industry. Sclerenchyma fibers are as durable as steel and as resilient and elastic as rubber. The amount and distribution of the fibers determine a plant organ’s durability when subjected to stretching, compression, and bending. In many plants the fibers form a mechanical facing for the vascular bundles. In the stems of dicotyledons they are found mainly in the pericycle and the primary phloem. In the stems and leaves of monocotyledons the fibers often form subepidermal cords, whereas in the roots they are concentrated primarily in the center. In addition to fibers of first derivation formed from the cells of the basic meristem and procambium, the term “sclerenchyma” is also applied to phloem and xylem (libriform) fibers of cambial origin. For information on sclereids see. L. I. LOTOVA sclerenchyma [sklə′reŋ·kə·mə] (botany) A supporting plant tissue composed principally of sclereids whose walls are often mineralized. sclerenchyma enUK sclerenchyma a plant tissue in which the cells have greatly thickened walls impregnated with LIGNIN, and no cell contents. The tissue has the mechanical function of supporting the plant, and consists of two types of cells: fibres and SCLEREIDS. fibres are long cells with tapered ends, which are often grouped into bundles.
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