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Annals of Botany 73: 1-11, 1994
© 1994 Annals of Botany Company

Deterministic Patterns of Cellular Growth and Division Within a Meristem

Jacqueline Lück, Peter W. Barlow and Hermann B. Lück

Laboratoire de Botanique analytique et Structuralisme végétal, Faculté des Sciences et Techniques de St-Jérôme, Rue Henri Poincaré, 13397 Marseille cedex 13, France and Department of Agricultural Sciences, University of Bristol, AFRC Institute of Arable Crops Research, Long Ashton Research Station, Bristol BS18 9AF, UK

The primary root meristem of maize (Zea mays L.) is composed of longitudinal files of cells arranged in groups of familial descent (sisters, cousins, etc.). In the proximal portion of the meristem, the cells in these groups, or packets, show ordered sequences of division that are transverse with respect to the apico-basal axis of the root. The division sequences fall into a relatively small number of pathways which can be described using deterministic 'bootstrap' L-systems. Although these systems can operate through the assignment of determinate lifespans to sister cells which thus specify their subsequent interdivisional period, because of their exponential growth kinetics the systems can also operate with determinate units of cell extension. This deterministic type of system allows simulation not only of the division sequences, but also of the lengths of the cells that are present within the packets which participate in the different division pathways. The types of L-systems used to describe these pathways also predict the distributions and ranges of cell and packet lengths found after varying numbers of cell generations. These distributions compare favourably with those actually found in the maize root meristem. Theoretical aspects of bootstrap L-systems, essential for their application to the one-dimensional cellular arrays of the meristematic cell-files of the maize root apex, are also presented.Copyright 1994, 1999 Academic Press

Cell division, cell elongation, cell polarity, L-system, root meristem, Zea mays


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