BRAINCAKEThe Symplast Pathway
Sucrose made in the mesophyll cells of a leaf must be loaded into the sieve tubes. There are two routes it can take. In symplastic loading, sucrose travels entirely through the symplast, the continuous cytoplasm of the cells, and never leaves the cytoplasm.
1. Sucrose is made in the cytoplasm of mesophyll cells.
2. It passes from cell to cell through plasmodesmata, the strands of cytoplasm that connect neighbouring cells.
3. It reaches the companion cells and then passes through more plasmodesmata into the sieve tube elements.
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More in Transport in Plants
- Factors Affecting Transpiration
- Root Pressure
- Translocation in the Phloem
- Phloem Loading
- The Apoplast Pathway
- Phloem Unloading
- Mass Flow Hypothesis
- Pressure Flow Hypothesis
All 21 lessons in Transport in Plants · All Edexcel AS-level Biology topics