Tendril
/ˈtɛn.drəl/
Definition
Tendril refers to a slender, flexible plant structure that coils around nearby support, helping a climbing plant attach and grow upward. It may be a modified leaf, leaflet, stem, or flower stalk, depending on the species. Unlike twining stems, which wrap with the whole shoot, a tendril is a specialized grasping organ that responds to touch and often forms tight coils, as seen in peas and many vines.
Function in Plants
- Climbing support: By coiling around nearby stems, wires, or other supports, tendril helps a plant climb without building a thick, self-supporting stem. This lets many vines reach better light with less investment in woody tissue.
- Different organs can form it: In different plant groups, tendril may develop from a modified leaf, leaflet, stipule, stem, or flower stalk. That variation can help botanists compare species and understand how similar climbing functions evolved more than once.
- Response to touch: Many tendril structures coil after contact, a growth response called thigmotropism. Cells on opposite sides grow at different rates, causing the curved or spiral form that tightens the plant onto a support.
- Useful for identification and training: Its position on the plant can be a helpful clue in identification, especially in vines such as peas, grapes, and cucurbits. In gardens, providing trellises or netting makes this climbing habit easier to manage and observe.
Related Terms
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Stem
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Leaf
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Thigmotropism
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Node
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