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 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:

  • 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 — 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 — [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

  • 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… …   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

  • Arabidopsis thaliana — Scientific classification Kingdom: Plantae (unranked) …   Wikipedia

  • plant development — Introduction       a multiphasic process in which two distinct forms succeed each other in alternating generations. One form, created by the union of sexual cells (gametes (gamete)), contains two sets of similar chromosomes (diploid). At sexual… …   Universalium

  • photopositive — “+ adjective Etymology: phot + positive : exhibiting positive phototropism or phototaxis …   Useful english dictionary

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