Definition of phototropism in English:


Line breaks: photo|trop¦ism
Pronunciation: /ˌfəʊtə(ʊ)ˈtrəʊpɪz(ə)m
, fəʊˈtɒtrəˌpɪz(ə)m


[mass noun] Biology
The orientation of a plant or other organism in response to light, either towards the source of light ( positive phototropism) or away from it ( negative phototropism). Compare with heliotropism, phototaxis.
More example sentences
  • The nucleus-localized, flavin-binding gene products, CRY1 and CRY2 are involved in several blue light responses, including phototropism.
  • Like other interactions between organisms and their environments, plant phototropism can be thought of as a process involving three phases: perception, transduction and response.
  • One of the earliest noted auxin effects was in phototropism, the curvature of stems toward a light source.



Pronunciation: /-ˈtrɒpɪk/
More example sentences
  • At the end of the blue light treatment, wild-type hypocotyls showed curvatures of about 60°C and red-fluorescing chloroplasts in the phototropic arch (not shown).
  • Blue-light reception in plants leads to phototropic plant movement, chloroplast relocation, and opening of stomatal guard cells.
  • Phototropins and homologs, recently renamed Phot proteins, comprise a class of blue-light receptors that are involved in phototropic plant movement, chloroplast relocation, and stomatal opening in guard cells.

Definition of phototropism in:

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