Chemotropism


Chemotropism

Chemotropism is growth of organisms (or parts of organism) such as bacteria and plants, navigated by chemical stimulus from outside of the organism. The response by the plant is termed ‘positive’ if the growth is towards the stimulus or ‘negative’ if the growth is away from the stimulus.

An example of chemotropic movement can be seen during the growth of the pollen tube, where growth is always towards the ovules. It can be also written that conversion of flower into fruit is the example of chemotropism.

Fertilization of flowers by pollen is achieved because the ovary releases chemicals that produce a positive chemotropic response from the developing pollen tube.

See also



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Look at other dictionaries:

  • chemotropism — CHEMOTROPÍSM, chemotropisme, s.n. (bot.) Chimiotropism. – Din germ. Chemotropismus. Trimis de valeriu, 13.09.2007. Sursa: DEX 98  chemotropísm s. n. (sil. tro ) Trimis de siveco, 10.08.2004. Sursa: Dicţionar ortografic  CHEMOTROPÍSM s.n.… …   Dicționar Român

  • chemotropism — [kə mä′trə piz΄əm, kem ä′trə piz΄əm; kem΄ō trō′piz΄əm] n. [ CHEMO + TROPISM] the tendency of certain plants or other organisms to turn or bend under the influence of chemical substances chemotropic [kē΄mō träp′ik, kem΄ōträp′ik] adj …   English World dictionary

  • chemotropism — chemotropizmas statusas T sritis chemija apibrėžtis Augalo augimo judesiai, sukelti cheminio dirgiklio. atitikmenys: angl. chemotropism rus. химиотропизм …   Chemijos terminų aiškinamasis žodynas

  • chemotropism — chemotropizmas statusas T sritis ekologija ir aplinkotyra apibrėžtis Kryptingi šaknų, dulkiadaigių ir grybų augimo judesiai, sukeliami cheminių dirgiklių. Skirstomas į hidrotropizmą (reakcija į drėgmę) ir aerotropizmą (reakcija į deguonį).… …   Ekologijos terminų aiškinamasis žodynas

  • chemotropism — noun Etymology: International Scientific Vocabulary Date: 1895 orientation of cells or organisms in relation to chemical stimuli …   New Collegiate Dictionary

  • chemotropism — n. [Gr. chemo, pert. chemistry; trope, turn] Reaction induced by a chemical stimulus; see tropism …   Dictionary of invertebrate zoology

  • chemotropism — Growth or possibly bending of an organism in response to an external chemical gradient. Sometimes used in error when the terms chemotaxis or chemokinesis should have been used …   Dictionary of molecular biology

  • chemotropism — chemotropic /kee meuh trop ik, troh pik, kem euh /, adj. chemotropically, adv. /ki mo treuh piz euhm/, n. Biol. oriented growth or movement in response to a chemical stimulus. [1895 1900; CHEMO + TROPISM] * * * …   Universalium

  • chemotropism — noun the movement or growth of an organism in response to a chemical stimulus See Also: chemotropic, chemotaxis …   Wiktionary

  • chemotropism — SYN: chemotaxis. [chemo + G. tropos, direction, turn] * * * che·mot·ro·pism ki mä trə .piz əm, ke n orientation of cells or organisms in relation to chemical stimuli che·mo·tro·pic .kē mə trō pik adj che·mo·tro·pi·cal·ly pi k(ə )lē adv * * *… …   Medical dictionary


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