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To account for the positive geotropism of roots, some researchers have proposed that under the influence of gravity, starch grains within the cells of the root fall towards the "bottom" of the cell. There they provide signals to the cell membrane, which are translated into growth responses.
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science.jrank.org/pages/3032/Geotropism.html
science.jrank.org/pages/3032/Geotropism.html
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GEOTROPISM IN ROOTS AND SHOOTS. 411 as the development of a geotropic curvature. ..... negative geotropic curvatures in roots by treatment with I- ...
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arjournals.annualreviews.org/doi/pdf/10.1146/annurev.pp...
arjournals.annualreviews.org/doi/pdf/10.1146/annurev.pp.12.060161.002205
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Transversal geotropism is a direction of growth vertical to the shoot's axis. All varying directions are called plagiotropic. Therefore, a plant's axis and main stem are positive/negative geotropic, side roots and certain leaves are transversal, and leaves that branch from the main stem at angles are plagiotropic.
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www.essortment.com/all/geotropism_rdux.htm
www.essortment.com/all/geotropism_rdux.htm
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Phototropism can therefore be understood as a secondary process, usually of the same direction as the negative geotropism. Transversal geotropism is a direction of growth that is vertical to the shoot axis. The direction of many lateral shoots, side roots, leaves, etc.
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www.biologie.uni-hamburg.de/b-online/e32/32c.htm
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Bedford College, London University ... The courses of positive curvature resulting from short exposures (40 minutes) and also subsequent recovery phenomena on a horizontal klinostat have been followed. ... Low concentrations (1 part in 1011) of both auxins increased the rate of positive curvature by 30–40 per cent.
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jxb.oxfordjournals.org/cgi/content/abstract/8/1/105
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the responses of roots of Ptsurn sativum to lateral geotropic stimulation it was ..... In view of the modification of geotropic response in roots by the ...
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jxb.oxfordjournals.org/cgi/reprint/12/1/75.pdf
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WE present here the first clear evidence that the positive geotropic response of roots can be prevented by dichloro-p-coumaric acid and p-coumaric acid.
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www.nature.com/nature/journal/v226/n5245/abs/226559a0.h...
www.nature.com/nature/journal/v226/n5245/abs/226559a0.html
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PLANTS grown in non-porous containers frequently show a lower concentration of roots on the periphery of the block of soil than similar plants grown in porous containers1, and there is sometimes a tendency for the direction of growth of these peripheral roots to be more nearly vertical in non-porous than in...
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www.nature.com/nature/journal/v191/n4785/abs/191300a0.h...
www.nature.com/nature/journal/v191/n4785/abs/191300a0.html
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In this experiment, you will find out whether plant roots change the direction they are growing as their position is changed in relation to the pull of gravity. Before you begin, make an educated guess about the outcome of this experiment based on your knowledge of plant growth.
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www.enotes.com/science-experiments-projects/tropisms/ex...
www.enotes.com/science-experiments-projects/tropisms/experiment-2-geotropism-will-plant-roots-turn
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