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单词 nyctinastic
释义

nyctinastic

/ˌnɪktɪˈnastɪk /
adjective Botany
(Of the periodic movement of flowers or leaves) caused by nightly changes in light intensity or temperature.Leaflets of nyctinastic plants assume a vertical (i.e. closed) position in darkness and revert to horizontal orientation upon illumination....
  • Leaf-movement in nyctinastic plants has long been believed to be controlled by plant hormones that are common among all nyctinastic plants.
  • Several systems of measurement have been used to characterize leaf or leaflet orientation during nyctinastic and heliotropic movement.

Derivatives

nyctinasty

/ˈnɪktɪˌnasti/ noun ...
  • The trifoliate leaflets are closed as in nyctinasty.
  • We found that nyctinasty is controlled by a periodic change of the internal concentration of leaf-opening and leaf-closing substances in the plant body.
  • What is the selective advantage to plants of nyctinasty (sleep movements) which closes flowers in the evening?

Origin

Early 20th century: from Greek nux, nukt- 'night' + nastos 'pressed' + -ic.

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更新时间:2024/12/25 1:04:18