Summary
The possibility of a relationship between the geotropic response and the sedimentation of amyloplasts was studied.
In the first experiment the geotropic curvature and the statolithic apparatus of the roots were defined individually. Statistical analysis showed no correlation between curvature (in its initial phase) and the average number of amyloplasts per cell in section, their average volume and the space that they occupy in the statocyte. These findings seem to exclude the possibility of the statoliths acting by pressure on some sensitive surface.
In the second experiment the initial rate of curvature and the percentage of amyloplasts along the longitudinal wall were analysed as a function of the angle of inclination relative to direction of gravity (45–150°). The results obtained show that at the various angles the initial rate of curvature is not dependent on the percentage of amyloplasts which are in contact with a sensitive surface. Nor can the displacement of the amyloplasts caused by the change of orientation explain the relationship between the degree of curvature and the angle of inclination. It seems that no direct link can be found between the sedimentation of the amyloplasts and the geotropic reaction in its initial phase. These results are discussed in reference to recent literature on the existence of growth inhibitors that could be responsible for the geotropic response.
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Bibliographie
Audus, L. J.: The mechanism of the perception of gravity by plants. Symp. Soc. exp. Biol. 16, 197–226 (1962)
Audus, L. J.: Geotropism and the modified sine rule; an interpretation based on the amyloplast statolith theory. Physiol. Plant. 17, 737–745 (1964)
Burström, H. G.: Orientation and geotropic reaction of seminal roots of wheat. Physiol. Plant. 25, 283–293 (1971)
Filner, B., Hertel, R.: Some aspects of geotropism in coleoptiles. Planta (Berl.) 94, 333–354 (1970)
Gibbons, S. B., Wilkins, M. B.: Growth inhibitor production by root caps in relation to geotropic response. Nature (Lond.) 226, 558–559 (1970)
Griffiths, H. J., Audus, L. J.: Organelle distribution in the statocyte cells of the root-tip of Vicia faba in relation to geotropic stimulation. New Phytol. 63, 319–333 (1964)
Hertel, R., de la Fuente, R. K., Leopold, A. C.: Geotropism and the lateral transport of auxin in the corn mutant amylomaize. Planta (Berl.) 88, 204–214 (1969)
Iversen, T. H.: Ehmination of geotropic responsiveness in roots of cress (Lepidium sativum) by romoval of statolith starch. Physiol. Plant. 22, 1251–1262 (1969)
Iversen, T. H., Larsen, P.: The starch statolith hypothesis and the optimum angle of geotropic stimulation. Physiol. Plant. 25, 23–27 (1971)
Iversen, T. H., Larsen, P.: Movement of amyloplasts in the statocytes of geotropically stimulated roots. The pre-inversion effect. Physiol. Plant. 28, 172–181 (1973)
Juniper, B. E., French, A.: The distribution and redistribution of endoplasmic retieulum (ER) in geoperceptive cells. Planta (Berl.) 109, 211–224 (1973)
Johnsson, A.: Investigations of the geotropic curvature of Avena coleoptile. I. The geotropic response curve. Physiol. Plant. 25, 35–42 (1971)
Larsen, P.: The optimum angle of geotropic stimulation and its relation to the starch statolith hypothesis. Physiol. Plant. 22, 469–488 (1969)
Mac Manus, J. F.: Histological and histochemical uses of periodic acid. Stain Technol. 23, 99–108 (1948)
Nougarède, A., Pilet, P. E.: Action de l'acide gibbérellique (GA3) sur l'ultrastructure des amyloplastes du statenchyme de la racine du Lens culinaris L. C.R. Acad. Sci. (Paris) 273, 348–351 (1971)
Perbal, G.: Action de la pesanteur sur la répartition des organites dans les cellules axiales centrales (statenchyme) de la coiffe du Lens culinaris L. C. R. Acad. Sci. (Paris) 273, 789–792 (1971)
Perbal, G.: Etude de la relation entre la vitesse de croissance des racines du Lens culinaris L. et leur courbure géotropique. C. R. Acad. Sci. (Paris) 276, 745–748 (1973)
Pickard, B. G., Thimann, K. V.: Geotropic response of wheat coleoptiles in absence of amyloplast starch. J. gen. Physiol. 49, 1065–1086 (1966)
Pilet, P. E.: Root cap and root growth. Planta (Berl.) 106, 169–171 (1972)
Pilet, P. E.: Growth inhibitor from the root cap of Zea mays. Planta (Berl.) 111, 275–278 (1973)
Pilet, P. E., Nougarède, A.: Action de l'acide gibbérellique sur la croissance et le géotropisme radiculaires. C. R. Acad. Sci. (Paris) 272, 418–421 (1971)
Shaw, S., Wilkins, M. B.: The source and lateral transport of growth inhibitors in geotropically stimulated roots of Zea mays and Pisum sativum. Planta (Berl.) 109, 11–26 (1973)
Shen-Miller, J., Miller, C.: Intracellular distribution of mitochondria after geotropic stimulation of oat coleoptiles. Plant Physiol. 50, 51–54 (1972)
Sievers, A., Volkmann, D.: Verursacht differentieller Druck der Amyloplasten auf ein komplexes Endomembransystem die Geoperzeption in Wurzeln? Planta (Berl.) 102, 160–172 (1972)
Wilkins, M. B.: Geotropism. Ann. Rev. Plant Physiol. 17, 379–408 (1966)
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Perbal, G. L'action des statolithes dans la réponse géotropique des racines de Lens culinaris . Planta 116, 153–171 (1974). https://doi.org/10.1007/BF00380650
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DOI: https://doi.org/10.1007/BF00380650