phototropism

phototropism
Movement of a part of an organism toward (positive p.) or away from (negative p.) the stimulus of light. Cf.:phototaxis. [photo- + G. trope, a turning]

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pho·tot·ro·pism fō-'tä-trə-.piz-əm, .fōt-ō-'trō-.piz-əm n a tropism in which light is the orienting stimulus see HELIOTROPISM
2) the reversible change in color of a substance produced by the formation of an isomeric modification when exposed to radiant energy (as light)

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pho·tot·ro·pism (fo-totґrə-piz-əm) [photo- + trop- + -ism] 1. tropism of an organism in response to the source of light stimulus. 2. change of color produced in a substance by the action of light.

Medical dictionary. 2011.

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  • Phototropism — is directional growth in which the direction of growth is determined by the direction of the light source. In other words, it is the growth and response to a light stimulus. Phototropism is most often observed in plants, but can also occur in… …   Wikipedia

  • Phototropism — Pho*tot ro*pism, n. [Photo + Gr. ? to turn.] 1. (Plant Physiol.) The tendency of growing plant organs to move or curve under the influence of light. In ordinary use the term is practically synonymous with {heliotropism}. [Webster 1913 Suppl.] 2.… …   The Collaborative International Dictionary of English

  • phototropism — 1899, from Ger. phototropie (1892), from PHOTO (Cf. photo ) + TROPISM (Cf. tropism) …   Etymology dictionary

  • phototropism — ► NOUN Biology ▪ the orientation of a plant or other organism either towards or away from a source of light. DERIVATIVES phototropic adjective …   English terms dictionary

  • phototropism — [fō tä′trə piz΄əm] n. [ PHOTO + TROPISM] any positive, or negative, movement of a part of a plant toward, or away from, light sources: see HELIOTROPISM phototropic [fōt΄ō träp′ik] adj …   English World dictionary

  • phototropism — Movement or growth of part of an organism (eg. a plant shoot) towards (positive phototropism) a source of light, without overall movement of the whole organism …   Dictionary of molecular biology

  • phototropism — fototropizmas statusas T sritis ekologija ir aplinkotyra apibrėžtis Vienašalės šviesos sukeltas augalo dalių judėjimas šviesos šaltinio link, nuo jo arba padedantis užimti skersinę padėtį šviesos spindulių krypties atžvilgiu. atitikmenys: angl.… …   Ekologijos terminų aiškinamasis žodynas

  • phototropism — fototropizmas statusas T sritis augalininkystė apibrėžtis Augalų linkimas į vienpusio apšvietimo šaltinį. atitikmenys: angl. phototropism rus. фототропизм ryšiai: sinonimas – šviesolinka …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • phototropism — noun Etymology: International Scientific Vocabulary Date: 1899 a tropism in which light is the orienting stimulus …   New Collegiate Dictionary

  • phototropism — n. [Gr. phos, light; tropos, turn] Movement determined by the direction of incident light; photropic adj …   Dictionary of invertebrate zoology

  • phototropism — /foh to treuh piz euhm, foh toh troh piz euhm/, n. Bot. phototropic tendency or growth. [1895 1900; PHOTO + TROPISM] * * * …   Universalium

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