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abscission
In vascular plants, the dropping of leaves, flowers, fruits, or stems at the end of a growing season, as the result of formation of a layer of specialized cells (the abscission layer) at the base of the stalk and the action of a hormone (ethene). In the abscission layer, the parenchyma cells beome separated from one another through dissolution of the middle lamella.
Related category
• BOTANY
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