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Some leaves have a special layer of cells that comprise anabscissionzone, which facilitates the breakdown and detachment of the leaf.
From theCambridge English Corpus
The funiculus abscises (detaches at fixed point -abscissionzone), the scar forming an oval depression, the hilum.
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These proteins are secreted from cells in the floralabscissionzone.
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Exhaustion of auxin makes theabscissionzonesensitive to ethylene.
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A similar process of cell separation caused by the breakdown of pectin occurs in theabscissionzone of the petioles of deciduous plants at leaf fall.
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This example is from Wikipedia and may be reused under a CC BY-SA license.
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