caa a22 4500 465821634 CHVBK 20180323112137.0 cr unu---uuuuu 170327e19901201xx s 000 0 eng 10.1007/BF00047240 doi (NATIONALLICENCE)springer-10.1007/BF00047240 Plant morphogenesis: A geometrical model for the ramification [Elektronische Daten] [Michel Ferré, Hervé Le Guyader] A geometrical model is proposed that describes the emergence of a primordium at the shoot apex in Dicotyledons. It is based on recent fundamental results on plant morphogenesis, viz.: the emergence is preceded by the reorganization of the microtubules of the cortical cytoskeleton, leading to a new orientation of the synthesis of the cell wall microfibrils; the resulting global stress is related to the general orientation of the cell growth; The model sums up the continuous interactions that link the microtubules, the microfibrils and the cell growth axis. The paper tries to answer three essential questions: Why does the principal stem shifts its growth direction after each lateral emergence? Why do the three axes involved in any ramification (namely the old and the new principal stems and the lateral emergence) exhibit a plane configuration whereas this is an essentially three dimensional phenomenon? Does phyllotaxis exclusively depend upon the local emergence of a primordium? An interactive procedure between empirical botanical knowledge and the mathematical model leads to an insight of the compatibility mechanisms that link the various microtubules and microfibrils networks, and the apical dome restoration. A geometrical formalism allows a redefinition of both the "generating centre” and the "organizing centre”, and their field effect. Kluwer Academic Publishers, 1990 Ferré Michel École Nationale Supérieure de Techniques Avancées, Laboratoire de Mécanique et d'Energé tique, 32 Bd. Victor, 75015, Paris, France aut Le Guyader Hervé Laboratoire de Biologie Cellulaire 4, CNRS UA 1134 "Développement et Morphogenèse” Bat. 444, Université de Paris Sud, Centre d'Orsay, 91405, Orsay, Cedex, France aut Acta Biotheoretica Kluwer Academic Publishers 38/3-4(1990-12-01), 181-206 0001-5342 38:3-4<181 1990 38 10441 https://doi.org/10.1007/BF00047240 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00047240 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ferré Michel École Nationale Supérieure de Techniques Avancées, Laboratoire de Mécanique et d'Energé tique, 32 Bd. Victor, 75015, Paris, France aut NATIONALLICENCE 700 1- Le Guyader Hervé Laboratoire de Biologie Cellulaire 4, CNRS UA 1134 "Développement et Morphogenèse” Bat. 444, Université de Paris Sud, Centre d'Orsay, 91405, Orsay, Cedex, France aut NATIONALLICENCE 773 0- Acta Biotheoretica Kluwer Academic Publishers 38/3-4(1990-12-01), 181-206 0001-5342 38:3-4<181 1990 38 10441 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer