Collenchyma (Greek word meaning "to increase") plant tissue is composed of elongated cells with unevenly thickened walls. They provide structural support, particularly in growing shoots and leaves. Collenchyma tissue composes, for example, the resilient strands in stalks of celery. Its growth is strongly affected by mechanical stress upon the plant. The walls of collenchyma in shaken plants may be 40%-100% thicker than those not shaken. A cell wall is a more or less solid layer surrounding a cell. ... A shoot is the fresh young growth of a plant stem. ... This article is about the leaf, a plant organ. ... Binomial name Apium graveolens L. Celery (Apium graveolens) is a herbaceous biennial plant in the family Apiaceae, native to the coasts of western and northern Europe, most commonly in ditches and saltmarshes. ...
References
Moore, Randy; Clark, W. Dennis; and Vodopich, Darrell S. (1998). Botany (3rd ed.). McGraw-Hill. ISBN 0697286231.
Collenchyma tissue is composed of elongated cells with unevenly thickened walls.
Collenchyma tissue composes, for example, the resilient strands in stalks of celery.
Unlike the collenchyma, mature sclerenchyma is composed of dead cells with extremely thick cell walls (secondary walls) that make up to 90% of the whole cell volume.
The collenchyma is the typical supporting tissue of the primary plant body and growing plant parts, though it is kept with unaltered structure and function even in outgrown organs like stems, petioles, laminae or roots.
In cross-sections of stems, the collenchyma commonly appears as discrete strands or as a peripheral cylinder that lies, depending on the species, either directly beneath the epidermis or is separated from it by several layers of parenchyma.
The walls of collenchyma cells are strengthened by the deposit of cellulose and the coating with pectin.
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