Translocation: is the movement of sucrose and amino acids in the phloem, from regions of production (the ‘source’) to regions of storage or to regions where they are used in respiration or growth (the ‘sink’).
- This is the movement of sucrose and amino acids in the phloem tubes of the plant.
- Glucose is very important as it makes many other important nutrients.
- For Example, Glucose is used to make sucrose.
- Sucrose then enters the phloem
- The phloem then transports the sucrose all across the leaf where it can be made used of.
Some parts of a plant can act as a source and a sink at different times during the life of a plant:
E.g. while a bud containing new leaves is forming it would require nutrients and therefore act as a sink.
However, once the bud has burst and the leaves are photosynthesising, the region would act as a source, sending newly synthesised sugars and amino acids to other parts of the plant.