collenchyma


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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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It was noted that these lacunae were arranged in four rows around the central cylinder and usually separated by row of collenchyma cells (that rich by starch grain) between the lacunae adjacent.
When comparing cell structure, Selected - PSU cultivar gave the thinnest epidermis and collenchyma. Whereas, IT82E - 16 cultivar gave the thickest epidermis and collenchyma.
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.S.
On the other hand, the Manihot caerulescens and Manihot tripartita fruits also present two regions in the sclerenchymatous mesocarp, being a constituted of gelatinous fiber-sclereids and another of brachysclereids; the endocarp possesses either collenchyma or fiber-sclereids (OLIVEIRA, 2007).
It consists of parenchyma, collenchyma, and sclerenchyma cells.
Cells of the ground tissue are of three types: parenchyma, collenchyma, and sclerenchyma (See Figure 7-9).
On the outside of the vascular cylinder lies 5 to 8 layers of angular collenchyma which forms the main mechanical tissue in the primary stem.
The cells with un-lignified, thickened wall, with cap or U-shape around the meristeles belong to the collenchyma, in contrast with other fern families.
The main nerve, very protuberant, in the adaxial and abaxial face, was strengthened by laminar collenchyma. The cylindrical vascular strand enclosed accessory medullary strands.
Plantain leaves also have a layer of collenchyma cells beneath a relatively thick-walled epidermis (Soekarjo, 1992).
Collenchyma cells are also specialized to provide plants the structural strength they need for support.