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Cladoptosis
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Cladoptosis (Ancient Greek κλάδος kládos "branch", πτῶσις ptôsis "falling" [noun]; sometimes pronounced with the p silent) is the regular shedding of branches.[1] It is the counterpart for branches of the familiar process of regular leaf shedding by deciduous trees. As in leaf shedding, an abscission layer forms, and the branch is shed cleanly.

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Functions of cladoptosis
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Cladoptosis is thought to have four possible functions: self-pruning (i.e. programmed plant senescence), drought response (characteristic of xerophytes) liana defence, and in some plant families, normal leaf drop is by shedding small whole shoots, rather than individual leaves.
- Self-pruning is the shedding of branches that are shaded or diseased, which are potentially a drain on the resources of the tree.
- Drought response is similar to the leaf-fall response of drought-deciduous trees; however, leafy shoots are shed in place of leaves.
- In tropical forests, infestation of tree canopies by woody climbers or lianas can be a serious problem. Cladoptosis, by giving a clean bole with no support for climbing plants, may be an adaptation against lianas, as in the case of Castilla.
- In the conifer family Cupressaceae, most species shed old foliage by cladoptosis, rather than individual leaf drop. Dawn redwood (Metasequoia glyptostroboides) and western redcedar (Thuja plicata) provide examples; within the family, the only species that do not use cladoptosis for shedding old foliage are the junipers (Juniperus) in sections Juniperus sect. Caryocedrus and J. sect. Juniperus.[2]
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See also
- Abscission
- Marcescence: the opposite phenomenon – withered branches (or leaves) stay on
References
- Jim Hole (2005). "Cladoptosis". Archived from the original on 2018-08-07. Retrieved 2007-01-14.
- "Cupressaceae (Cypress family) description". The Gymnosperm Database. 1911-11-11. Retrieved 2025-08-09.
Further reading
- K. V. Bhat; T. Surendran; K. Swarupanandan (1986). "Anatomy of Branch Abscission in Lagerstroemia microcarpa Wight". New Phytologist. 103 (1): 177–183. Bibcode:1986NewPh.103..177B. doi:10.1111/j.1469-8137.1986.tb00606.x.
- Lorenza M. Bellani; Alessandro Bottacci (2004). "Anatomical studies of branchlet abscission related to crown modification in Quercus cerris L.". Trees. 10 (1): 20–23.
External links
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