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Translocation is the movement of sucrose and amino acids in phloem from sources to sinks.
Leaves are the primary sites of photosynthesis, where carbohydrates are produced. These carbohydrates, along with other organic substances, need to be distributed to other parts of the plant. Some key substances made in leaves include:
Key Point: Translocation specifically refers to the transport of sucrose and amino acids through the phloem tissue.
A source is the part of a plant that releases sucrose or amino acids to be transported to other parts.
Characteristics of sources:
A sink is the part of a plant to which sucrose or amino acids are being transported, and where they are used or stored.
Characteristics of sinks:
Common sinks and their functions:
| Sink | Function |
|---|---|
| Roots | Convert sucrose to starch for storage |
| Flowers | Use sucrose to make fructose for nectar |
| Fruits | Use sucrose to produce sweet, juicy fruits to attract animals |
| Growing buds | Use sucrose for growth and development |
| Storage organs | Store materials as starch or other compounds |
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