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Zone further defined

Ethylene triggers enzyme release

A later stage of development with a well-defined abscission zone separating the stem (S) from the petiole (P).

The abscission zone cells release enzymes that degrade the middle lamellae of their walls. This enzymatic release is triggered by the plant growth regulator ethylene, a gas. However, the plant growth regulators auxin and cytokinin appear to have an opposite effect in inhibiting abscission.

 
   
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