(Of the movement of plant parts) caused by an external stimulus but unaffected in direction by it.
- They may have a role in turgor regulation in response to salt and hyper-osmotic stresses, in nastic and gravitropic movements, in stomatal closure and in pollen tube elongation.
- In biology, nastic refers to the natural movement of plants in response to changes in their environment, such as plants that track sunlight or that stiffen when watered.
Early 20th century: from Greek nastos 'squeezed together' (from nassein 'to press') + -ic.
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