negative phototropism
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. (Microbiology) exhibiting movement in a direction toward ({positive phototropism}) or away from ({negative phototropism}) a source of light. [PJC]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • negative phototropism — The tendency to retreat from light …   Dictionary of invertebrate zoology

  • 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 — [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 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] * * * pho·tot·ro·pism fō tä trə .piz əm, .fōt ō trō .piz əm n a tropism in which light is the… …   Medical dictionary

  • positive phototropism — 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… …   The Collaborative International Dictionary of English

  • nervous system — Anat., Zool. 1. the system of nerves and nerve centers in an animal or human, including the brain, spinal cord, nerves, and ganglia. 2. a particular part of this system. Cf. autonomic nervous system, central nervous system, peripheral nervous… …   Universalium

  • photonegative — |fōd.(ˌ)ō+ adjective Etymology: phot + negative : exhibiting negative phototropism or phototaxis …   Useful english dictionary

  • photonegative — adjective Date: 1914 exhibiting negative phototropism or phototaxis …   New Collegiate Dictionary

  • Vine — This article is about the term vine in its broad sense. For grapevines, see Vitis. For other uses, see Vine (disambiguation). A tendril …   Wikipedia

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