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Annals of Botany 89: 409-417, 2002
© 2002 Annals of Botany Company

Maintaining Apical Dominance in the Fern Gametophyte

DAVID M. HOLLOWAY*,1 and MARIA LANTIN{dagger},2

1Department of Chemistry, University of British Columbia, Vancouver, B.C. Canada V6T 1Z1 and 2School of Computing Science, Simon Fraser University, Burnaby, B.C. Canada V5A 1S6

* For correspondence. Fax 00 1 604 822–2847, e-mail david{at}pepe.chem.ubc.ca. Also at: Mathematics Department, British Columbia Institute of Technology, Burnaby, B.C., Canada V5G 3H2
{dagger} Present address: IDELIX, Suite 400–1122 Mainland St, Vancouver, B.C., Canada V6B 5L1

Received: 3 August 2001; Returned for revision: 12 November 2001; Accepted: 17 December 2001.

A kinetic model is developed for cell differentiation in the fern gametophyte to test hypotheses on the role of spatially patterned plasmodesmata networks in development. Of particular interest is the establishment and maintenance of apical cell type in a single cell, with concurrent suppression of this character in all other cells (apical dominance). Steps towards understanding apical cell localization in geometrically simple gametophytes may shed light on the establishment and maintenance of apical meristems in higher plants. The model, based on the plasmodesmata maps of Tilney and colleagues and involving kinetics for a requisite minimum of two morphogens, successfully produces the apical/non-apical cell differentiation patterns of normal development, and redifferentiation due to cell isolation, in six stages from 0–30 d of development. Our results indicate that increasing apical cell plasmodesmata number, as development progresses, is not required for effective transport across apical cell walls in maintaining apical dominance.

Key words: Fern, Onoclea sensibilis, gametophyte, apical dominance, plasmodesmata, intercellular transport, meristem, cell differentiation, redifferentiation, pattern formation, mathematical model, plant development.


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D. M. Holloway and L. G. Harrison
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