Distinctiveness of the Inner Organization of Dicot Root

Distinctiveness of the inner organization of Dicot Root

Dicot roots of gram shows following distinct region in its Transverse section with following features: Epiblema, Cortex, Endodermis, Pericycle, Vascular bundles and Pith.

  • Epiblema is the outermost unilayered with several unicellular root hairs. It consists of thin walled, compactly arranged living parenchymatous cells.
  • Cuticle is absent in the epiblema and well fitted with unicellular root hairs.
  • Cortex is thin walled, multilayered region made from circular or polygonal parenchymatous cells.
  • Endodermis is the innermost layer of cortex and covers the stele. It consists of one layered cells and casparian strips are present in endodermal cells.
  • Pericycle is the outermost layer of stele and composed of uniseriate layer of parenchymatous cells. It is composed of one Layered cells.
  • Vascular bundles are two or six in number and they are radial type.
  • Xylem is exarch type, i.e., proto-xylem is situated towards the periphery.