phototropism

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Related to phototropic: geotropic, phototrophic

phototropism

 [fo-tot´ro-pizm]
1. tropism of an organism in response to light; it may be either positive (toward the light) or negative (away from the light).
2. change of color produced in a substance by the action of light. adj., adj phototrop´ic.

pho·tot·ro·pism

(fō-tot'rō-pizm),
Movement of a part of an organism toward (positive phototropism) or away from (negative phototropism) the stimulus of light. Compare: phototaxis.
[photo- + G. tropē, a turning]

phototropism

/pho·tot·ro·pism/ (fo-tot´rah-pizm)
1. the tendency of an organism to turn or move toward or away from light.
2. color change produced in a substance by the action of light.phototrop´ic

phototropism

(fō-tŏt′rə-pĭz′əm, fō′tō-trō′-)
n.
Growth or movement of a sessile organism toward or away from a source of light.

pho′to·tro′pic (fō′tə-trō′pĭk) adj.

pho·tot·ro·pism

(fō-tot'rŏ-pizm)
Movement of a part of an organism toward (positive phototropism) or away from (negative phototropism) the stimulus of light.
Compare: phototaxis
[photo- + G. tropē, a turning]

phototropism

a bending growth movement of parts of a plant in response to a light stimulus. The movement produced by unequal growth is due to differences in AUXIN concentration. For example, most seedlings are positively phototropic, growing towards a light stimulus, because there is a greater concentration of auxin on the side furthest away from the light, giving greater growth on this side. Roots, on the other hand, are often negatively phototropic, growing away from a light source.

phototropism 

Reaction of certain plants and animals to move towards (positive phototropism) or away from (negative phototropism) a source of light.

phototropism

1. the tendency of an organism to turn or move toward (positive phototropism) or away from (negative phototropism) light.
2. change of color produced in a substance by the action of light.
References in periodicals archive ?
Botanically speaking, roots are phototropic and geotropic or, in other words, they naturally grow away from the light, vertically downwards.
What's more, edible landscaping doesn't require a move to the country or a phototropic sleep pattern.
Cragg & Crisp (1991) analyzed the results obtained by other authors and suggested that pectinid settlement is positively geotactic and negatively phototropic.
Yet if this were so, it would seem to require imputing the same grasp to phototropic plants and barometers.
Bergey's Manual of Systematic Bacteriology, 2nd Edition, Volume 1: The Archaea and the Deeply Branching and Phototropic Bacteria George Garrity, ed.
The sunflower is phototropic when the plant is in the bud stage, meaning that it tends to follow the movement of the sun from east in the morning to west in the afternoon.