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Plant organs. Root.

PRIMARY FROWTH. MONOCOT.

Root hairs
Epidermis
Cortex
Endodermis
Medullary parenchyma
Primary xylem
Primary phloem
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Raíz primaria
Root: primary growth. Monocotyledon.
Species: bramble (Smilax sp).
Technique: safranin-alcian blue in paraffin sections.

Polyarch root of a monocot plant. The epidermis is uniseriate showing a cuticle a bit thicker than in dicot plant epidermis. Among the epidermal cells, root hairs with different lengths can be observed. The cortex is wide, and shows a sclerenchyma layer under the epidermis. The endodermis is under the cortex, with the well-visible Casparian stripe. Under the endodermis, there is no pericycle layer, but 2 or 3 rows of cells with thick cell walls, and therefore unable to perform meristematic roles. It means that pericycle cells became sclerified and that this image corresponds to a rather mature region of the root.

There is a high number of rows of primary xylem cells arranged circularly having large vessels or tracheae. In the center of the root there is a medullary region with sclerenchyma cells with thick cell walls. The presence of a medullary region is a feature of monocot plants. The primary phloem is organized in thinner rows of cells between the primary xylem rows, and below the endodermis.

Home / Plant organs / Root / Primary growth / Monocot
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