It is convenient to recognize two categories of adaptations for climbing plants, active mechanisms, involving growth and tropisms of the plant to become attached and passive mechanisms, whereby they have existing structures that come in contact with the supporting structure. Each mechanism provides biomechanical and ecological advantages and disadvantages, depending on the situation in which the vine or liana is growing.
Tendrils are often spring-like and cinch up a plant to the support by decreasing the overall length of the tendril. This coiling feature utilizes high friction for grasping structures. For vines, tendrils are a cheap way to climb, but a tendrilar system does not hold great weight. This mechanism is good for clinging during strong winds, and absorbs and dissipates energy. Development of tendrils is sylleptic and determinate.
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Twining often occurs in one direction, and many show a predisposition to turn to the right. There is a limit to the size trunk that most twiners can use, and hardly ever are twiners found around thick trunks.
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Adventitious roots can be used to climb on the bark of any size tree. Because they root as they grow, some vines with adventitious become hemiepiphytes. A number of the species in dark tropical forests are skototropic, growing away from light to dark surfaces.
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Spines and stiff emergences provide ways to attach to other plants. Using hooks especially is common in dense stands, where hooks come in contact with other plants. Spines also have the added benefit of being antiherbivore features, including spiny rattans, especially in Asia.
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By having opposite branching or stiff, perpendicular leaves, plants can be wedged into trees to provide more support.
Scrambling plants often use stiff branches and hooks.
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