paraheliotropismn.
/ˌparəhiːlɪə(ʊ)ˈtrəʊpɪz(ə)m/, /ˌparəhiːlɪˈɒtrəpɪz(ə)m/, U.S. /ˈˌpɛrəˌhiliˈɑtrəˌpɪz(ə)m/ Botany.
A type of tropism in which a plant's leaves move to reduce injuriously intense illumination, usually by keeping their blades parallel to the light rays.
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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
1881 C. Darwin in Nature 3 Mar. 409/1 This remarkable movement I have called paraheliotropism.
1897 Amer. Naturalist 31 438 Many Leguminosæ place their leaflets in a vertical position during the heat of the day (para-heliotropism).
1977 Amer. Jrnl. Bot. 64 1032/1 Paraheliotropism was observed in the Fabaceae by Wilson and Greenman.., who hypothesized that the degree of cupping varies with changes in environmental conditions.
1994 Functional Ecol. 8 387/1 In soybean, increased paraheliotropism was associated with P deficiency.
This entry has been updated (OED Third Edition, June 2005; most recently modified version published online March 2022).
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n.1881