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 ?
Thus, the results imply that the phototropic mechanisms underlying crown orientation are differentially responsive to direct and diffuse components of the radiation environment.
Binoculars have been placed along the bridge for us to look at what to New Yorkers have the appearance of cockroaches dusted with boric acid, showing their usual negatively phototropic behavior.
Once a trunk is reached, there is a switch to positively phototropic growth.
They range from electro- and phototropic glass to integrated systems of climate control and energy conservation.
When the apical internodal cell is removed, gravicurvature is inhibited whereas phototropic curvature is unaffected.
Unique Characteristics: Some Anemones are phototropic, or bend toward light; prefers cooler temperatures.
In multicellular organs, phototropic sensing is based upon gradients in stimulus strength across the entire tissue.
By erasing the appurtenances of life, one erases a certain vitality from the works: the paintings seem driven back into the canvases by the relentless light, as though negatively phototropic.
Vicky Dean, Hants DAVID: Most plants are phototropic, meaning they grow towards the light and leaves try to face the sun.
Daylight can be manipulated with such devices as electro-and phototropic glass, automated louvers and blinds, and reflective and prismatic techniques such as are used by Behnisch, Behnisch & Partner in Cambridge, Mass.
Unique Characteristics: flower stem is phototropic, bending toward the light; marry cultivars are available.
Continuing developments in the nature of glass itself, making the material on a large scale structurally efficient, and phototropic or electrotropic could lead to buildings that change with every cloud that passes in front of the sun.