Root Tissue

Below is a microscopic cross-section of a typical root (taken from a dicotyledonous plant)

  • Distribution of tissues may differ between different types of plants according to functional requirements

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Key Features:

  • The outer layer (epidermis) may have protrusions called root hairs to increase available surface area for material exchange
  • The central region is called the stele and is surrounded by an endodermis with a Casparian strip (controls water transport)
  • The pericycle / cambium provides strength to the root and is also responsible for the development of lateral roots
  • The vascular bundle is located centrally to withstand stretching forces and allow for material transport to be controlled