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| Nastic
Movement |
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 One of the most
interesting examples of time-lapse photography depicts a vine growing in search of a
support. To the naked eye any discernible movement seems arbitrary. However, the
time-lapse film shows us that the movement is deliberate and predictable: the stem traces
a wide circle—always in the same direction—as it grows in search of something to
cling to or wind around. Once it touches an object, a twining stem continues this
spiraling movement, winding around the support. Movement like this is not a direct
response to an external stimulus such as light or gravity, and is called nastic movement. This phenomenon may be
controlled by plant growth regulators and/or the movement of water into or out of cells.
Again, the exact mechanism is unknown. |
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