| 单词 |
nastic |
| 释义 |
nastic, a. Bot.|ˈnæstɪk|
[a. G. nastisch (E. Strasburger Lehrbuch der Botanik (ed. 6, 1904) I. ii. 221), f. Gk. ναστ-ός pressed together + -ic.]
Of movements of parts of plants: uninfluenced by the direction of an external stimulus.
1908W. H. Lang tr. Strasburger's Text-bk. Bot. (ed. 3) 270 When..the movement results from the internal disposition of the structure it is spoken of as nastic. 1912Ibid. (ed. 4) 300 Nastic movements..are curvatures which bring about a particular position in relation to the plant and not to the direction of the stimulus. 1929J. C. Bose Growth & Tropic Movements Plants xx. 216 If the movement be nastic, then the closure or the opening movement will remain the same, whether the organ be held in normal position or upside down. 1951M. Abercrombie et al. Dict. Biol. 150 Nastic movements are classified according to nature of stimulus, e.g. photonasty, response to alteration in light intensity, thermonasty, response to alteration in heat intensity, seismonasty, response to shock. 1965Bell & Coombe tr. Strasburger's Textbk. Bot. 380 Nastic movements, depending on growth differences on the two sides of the organ concerned, are seen particularly clearly in the perianth segments of the many flowers which open or close according to the temperature. |
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