Extract from text: "ABSCISSION (Leaf fall)
- Light levels fall fall in conc. of auxin Plant produces ethane initiate gene switching, producing new enzymes digest and weaken the cell walls in the outer layer of the abscission zone (separation layer)
- Vascular bundles sealed off; fatty material deposited in the cells under the separation layer (forming the protective layer) prevents entry of pathogens + waterproof
- Cells in the separation layer retain water and swell puts pressure on the weakened outer layer
- Further abiotic factors (e.g. winds) blow the leaves off"
- Light levels fall fall in conc. of auxin Plant produces ethane initiate gene switching, producing new enzymes digest and weaken the cell walls in the outer layer of the abscission zone (separation layer)
- Vascular bundles sealed off; fatty material deposited in the cells under the separation layer (forming the protective layer) prevents entry of pathogens + waterproof
- Cells in the separation layer retain water and swell puts pressure on the weakened outer layer
- Further abiotic factors (e.g. winds) blow the leaves off"
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