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Translocation (Cambridge O Level Biology)
Revision Note
Translocation
- The soluble products of photosynthesis are sugars and amino acids
- These are transported around the plant in the phloem
- Sugars are transported in the form of sucrose
- The transport of sucrose and amino acids in the phloem, from regions of production to regions of storage or use, is known as translocation
- Translocation involves the transport of dissolved substances from a source to a sink inside a plant
- A source is the part of a plant that supplies sucrose and amino acids
- A sink is where sucrose and amino acids will be used or stored
- Transport in the phloem occurs in different directions depending on the stage of development or the time of year
Sources and sinks table
| Region | Definition | Examples |
| Source | The part of a plant that supplies sucrose and amino acids | A photosynthesising leaf during summer will produce sugars which can be transported to other parts of the plant |
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A storage organ in the roots, e.g. a potato tuber, during early spring will break down starch to produce sugars; this will fuel the growth of new leaves
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| Sink | The part of a plant that uses or stores sucrose and amino acids |
A leaf bud during early spring will not yet be photosynthesising, so will need a supply of sugars from a storage organ
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A storage organ in the roots during the summer; leaves will produce more sugars than they need at this time of year, so excess sugars can be stored
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