nastic movement

(ˈnæstɪk)

(Botany) a response of plant parts that is independent of the direction of the external stimulus, such as the opening of buds caused by an alteration in light intensity

[C19 nastic, from Greek nastos close-packed, from nassein to press down]

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Nastic movements are those made in response to some stimulus but are not oriented relative to the direction of the stimulus.

Using one of the search engines on the Internet, such as Google, Yahoo!, Ask.com, and MSN Live Search, find more information by searching for these words or phrases: plant growth and development, photoperiod, phytochrome, plant biological clocks, short-day plants, long-day plants, day neutral plants, plant hormones, auxin, IAA, parthenocarpic fruit, apical, gibberellins, bioassay, cytokinins, abscisic acid, ethylene, postharvest physiology, flowering hormone, tropisms, and nastic movements.