The hypocotyledonary epidermis (Figure 2B and C) is uniseriate and exhibits stomata and unicellular non-glandular trichomes, while the cortex (Figure 2B and C) consists of collenchyma
, parenchyma and starchy endodermis.
In transversal sections the adaxial face shows subepidermical lacunar collenchyma
and two or three cellular strata of palisade parenchyma (Figure 4S).
It is evident in this study that, although the analyzed Piper species show thin and flexible leaves, the hypodermis is present on both surfaces in a varied number of layers; furthermore, it can also differentiate into a collenchyma
next to the central rib on adaxial leaf surfaces.
A mature haustorium of Castilleja is composed of a plate xylem zone surrounded by parenchyma, a centrally located core of collenchyma
(with vessel members scattered), and the haustorial surface (Dobbins & Kuijt 1973a).
4A) and that the epidermis cells was not surrounded by clear layer of cuticle and composed of a compact cells containing chlorophyll, either the cortex, it begins with two layers of collenchyma
cells, located under the epidermis and is characterized by the absent of air spaces between the cells (Fig.
In regard to the anatomical characteristics, the leaves in the transverse section showed a uniseriated epidermis on both sides, homogeneous collenchyma
with isodiametric cells and a thin cell wall.
When comparing cell structure, Selected - PSU cultivar gave the thinnest 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.
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).
cells, found in the stem, and sclerenchyma cells have thickened cell walls and provide mostly structural support for the plant.
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.