PHLOEM

• Sieve elements

  • Principal conducting cells
  • Are called because of the presence of sieve like wall perforations (sieve areas)
• Sieve-tube Element

  • Angiosperm
  • With sieve plates
  • Associated with Companion cell
• Sieve Cell

  • Gymnosperm
  • Without sieve plates
  • Associated with albuminous cell or Strasburger cells
• Principal functions of sieve elements (such as sieve cells, sieve-tube elements) in the Axial System is long distance conduction of food materials; long distance signaling
• Principal Functions of Sclerenchyma cells in the Axial system is to support; sometimes storage of food materials.
• Principal functions of Parenchyma cells is storage and radial translocation of food substances.
• The function of phloem is to transport sugars and amino acids from the leaves to the rest of the plant.