Articles

Biologische «Quantensprünge» bei der Sprossgestaltung von Kakteen

Manfrid Gädeke
Elemente der Naturwissenschaft 110, 2019, P. 5-31 | DOI: 10.18756/edn.110.5
Article | Language: German | €6.00
Export Article Citation as

Abstract:

Often different phyllotactic patterns occur in plants of the same species or even in shoots of the same plant. On plants with densely standing “eyes,” like the cacti, the phyllotactic pattern is well recognizable. It is usually strictly geometric. Despite the obvious “kinship” of these patterns, they can not change into each other continuously, but only by leaps and bounds. The principle of such volatility is examined here in order to obtain a model for less clear delimitations of organisms, of organ forms, and of modes of formation, as well as their interrelations in metamorphosis. It is hoped that this will also shed light on periodicities in the inorganic range. Keywords: Golden Ratio, Metamorphosis, Phyllotaxis, Quantum Leaps

References
  • Fierz, V. (2015): Aberrant phyllotactic patterns in cones of some conifers: a quantitative study. Acta Societatis Botanicorum Poloniae 84, No. 2, S. 261–265.
  • Gädeke, M. (2012): Der Typus zwischen Rationalität und Irrationalität – oder: Das geheime Gesetz des Siebensterns (Trientalis europaea). In: Jahrbuch für Goetheanismus. Niefern-Öschelbronn, S. 129–168.
  • Gädeke, M. (2017): Hochblatt und Typus. In: Elemente d. N. 107, S. 5–35.
  • Goethe, J.W. (1817): Die Absicht eingeleitet. In: Goethes Naturwissenschaftliche Schriften (Hrsg. R. Steiner, 1890, Stuttgart, Berlin, Leipzig), Bd. 1, S. 7ff oder Leopoldina-Ausgabe (LA), Bd. 9, 1994, Weimar.
  • Gola, E.M. (1997): Phyllotactic spectra in cacti: Mammilaria species and some genera from Rebutia group. Acta Societatis Botanicorum Poloniae 66, No. 3–4, S. 237–257.
  • Gola, E.M. (2006): Phyllotactic pattern formation in early stages of cactus ontogeny. Acta Societatis Botanicorum Poloniae 75, No. 4, S. 271–279.
  • Hofmeister, W. (1868): Allgemeine Morphologie der Gewächse. In: Handbuch der Physiologischen Botanik, Bd. I. Leipzig, S. 405–664.
  • Rutishauser, R. (2019): Ever since Darwin: Why plants are important for evo-devo research. In: Fusco, G. (Hrsg.): Perspectives on Evolutionary and Developmental Biology. Essays for Alessandro Minelli. Padova.
  • Steiner, R. (1919): 1. Naturwissenschaftlicher Kurs. Faksimile 2. Aufl. 1964. Dornach, GA 320.
  • Troll, W. (1937): Vergleichende Morphologie der höheren Pflanzen, Bd. 1, Teil 1, Berlin (Nachdruck 1967, Koenigstein-Taunus).