Adaptations of the phloem to its functions

 Adaptations of the phloem to its functions

• The sieve tube cells are elongated, tubular and placed end to end to from a continuous channel for transportation of materials.
• Plasmodesmata of are enlarged to reduce resistance to flow o f food materials
• The sieve plates are performed by numerous pores to allow the passage of materials from one sieve element to the next.
• The sieve tube cells have no nuclei hence avail more space for translocation.
• The companion cells are highly metabolic to sustain needs of the sieve tube.
• Phloem parenchyma aids in the storage of food and in controlling slow conduction.
• Phloem fibers provide mechanical support and rigidity to plant organs.

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