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Originally (with J. v. SACHS, for example) was phototropism called heliotropism, because the plant grows towards the sun. ... The effect remains even after the UV part is taken away. Red, yellow , and green light has no effect on most plants. Red light causes a phototropic reaction in some fern prothalliums, though.
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www.biologie.uni-hamburg.de/b-online/e32/32b.htm
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Went also discovered that it is the unequal distribution of auxin that causes the bending in phototropism. ... This causes PIN proteins to redistribute to the underside of the cell where they pump auxin out of the cell; that is, they are efflux transporters.
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users.rcn.com/jkimball.ma.ultranet/BiologyPages/T/Tropi...
users.rcn.com/jkimball.ma.ultranet/BiologyPages/T/Tropisms.html
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Phototropism (pronounced foe-TA-tro-piz-em) is the growth of a plant in the direction of its light source. ... hydrotropism, in which the presence of water causes a response; galvanotropism, in which a plant reacts to a direct electrical current; thigmotropism, in which a plant responds to being touched or some form of contact;
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www.scienceclarified.com/Oi-Ph/Phototropism.html
www.scienceclarified.com/Oi-Ph/Phototropism.html
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Stimulation of the blue light phototropic receptor NPH1 causes a transient increase in cytosolic Ca2+. Gideon Baum*,†,; Joanne C. Long‡,§, ...
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www.pnas.org/content/96/23/13554.abstract
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Pretreatment of seedlings with gibberellic acid causes increased phototropic curvature, but experiments using 14C-gibberellic acid indicate that gibberellic ...
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www.ncbi.nlm.nih.gov/pmc/articles/PMC543246/
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Related to this model, Naqvi (1972) proposed that light-induced production of abscisic acid on the illuminated flank of the seedling causes unequal polar auxin transport. To test the idea that unequal polar auxin transport gives rise to phototropism, Gardner et al.
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www.plantcell.org/cgi/content/full/18/5/1110
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Phototropism is generally described as a plant's response to light. There are two kinds of phototropism: positive photropism, or the growth of a plant stem towards light, and negative phototropism, or the growth of a plant's roots away from light.
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homepage.smc.edu/hodson_kent/plant_growth/Hormones/Phyt...
homepage.smc.edu/hodson_kent/plant_growth/Hormones/Phytochrome/phototropism.htm
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Phototropism is commonly seen in plants as the tend to grow toward the sunlight. The reason for this is through the hormone auxin which is stimulated by darkness and causes growth. That sounds like the opposite of the way it should be, but it is not.
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www.madsci.org/posts/archives/feb98/885718992.Bt.r.html
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Phototropin causes phototropism, a bending response toward a light source. Therefore, phototropism only occurs if the light source contains blue wavelengths. Being able to sense different colors of light with pigments allows plants to respond to their environment in several ways.
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www.madsci.org/posts/archives/Apr2003/1050540151.Bt.r.h...
www.madsci.org/posts/archives/Apr2003/1050540151.Bt.r.html
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