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单词 nyctitropism
释义

nyctitropismn.

Brit. /ˌnɪktᵻˈtrəʊpɪz(ə)m/, U.S. /ˌnɪktəˈtroʊˌpɪz(ə)m/
Origin: Formed within English, by compounding. Etymons: nycti- comb. form, -tropism comb. form.
Etymology: < nycti- comb. form + -tropism comb. form. Compare nyctitropic adj.
Botany.
= nyctinasty n.Originally named nyctitropism, it was later renamed nyctinastism or nyctinasty (see quot. 1906 at nyctinastic adj.), as a nastic movement rather than a directional tropism is involved.
ΘΚΠ
the world > plants > part of plant > growth, movement, or curvature of parts > [noun] > tropisms
heliotropism1854
geotropism1873
apheliotropism1880
apogeotropism1880
nyctitropism1880
paraheliotropism1881
hydrotropism1882
selenotropism1883
selenotropy1883
rheotropism1884
orthotropism1885
plagiotropism1886
geotropy1888
haptotropism1888
aerotropism1889
phototropy1892
autotropism1897
plagiotropy1898
thermotropism1898
traumatropism1898
phototropism1899
gravitropism1969
1880 C. Darwin & F. Darwin Power of Movement in Plants 281 Nyctitropism and nyctitropic, i.e. night-turning, may be applied both to leaves and flowers,..but it would be best to confine the term to leaves.
1895 Amer. Naturalist 29 1101 Under a yellow screen nyctitropism is not quite so accelerated as under red.
1919 Jrnl. Ecol. 7 28 I would suggest that an explanation of the phenomenon of nyctitropism may be sought in reference to the presence or absence of osmotically active assimilation products..in pulvinar tissue readily sensitive to differences of turgidity.
1921 J. Small Textbk. Bot. xxvi. 378 Nyctitropism or Nyctinastism includes the opening and closing of flowers.., also the rising and falling of leaves..in response to the stimulation of changes in temperature and light.
2001 Melbourne Express 19 June 11 Nyctitropism is the tendency of leaves and petals of certain plant varieties to assume a different position at night.
This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022).
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n.1880
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