Active Translocation


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•  Plants transport organic compounds from sources to sinks

Translocation is the movement of organic compounds (e.g. sugars, amino acids) from sources to sinks

  • The source is where the organic compounds are synthesised – this is the photosynthetic tissues (leaves)
  • The sink is where the compounds are delivered to for use or storage – this includes roots, fruits and seeds

Organic compounds are transported from sources to sinks via a vascular tube system called the phloem

  • Sugars are principally transported as sucrose (disaccharide), because it is soluble but metabolically inert
  • The nutrient-rich, viscous fluid of the phloem is called plant sap

Active Translocation