Rhythmic plant morphogenesis: Recurrent patterns of idioblast cell production |
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Authors: | P W Barlow J Lück |
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Institution: | (1) School of Biological Sciences, University of Bristol, Woodland Road, Bristol, BS8 1UG, UK;(2) Atelier de structuralisme végétal, 1226 Chemin du Val d’Arenc, 83330 Le Beausset, France |
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Abstract: | Most plants are constructed from repeating modular units such as phytomers, merophytes, and cell packets. Even an organism
as simple as the filamentous cyanobacterium Anabaena shows recurrent patterns of differentiated cellular structures, notably with respect to its heterocysts. These examples reflect
the inherent rhythms established within developmental processes of living organisms. In the present article, attention is
paid to repetitious production of idioblasts—isolated cells, or clusters of cells, with an identity different to that of neighbouring
cells from which they are derived. In higher plant root tissues, idioblasts are contained within cell packets that grow up
from mother cells during the course of a number of cycles of cell production. The heterocysts of Anabaena are also discussed; they, too, are a type of idioblast. The idioblasts of root tissues originate as small cells which result
from unequal cell divisions. Such divisions are usually the final ones within a cell packet which has already undergone a
number of division cycles and are characteristically located at one or both ends of a packet. The packet end walls are suggested
to have a role in regulating division asymmetry. Idioblastic systems discussed are root cortical trichosclereids and diaphragm
cells; in their earliest stage, the cells from which lateral root primordia arise are also considered as clusters of idioblasts
because they, too, are the products of asymmetric divisions of pericyclic mother cells. The division patterns of all these
idioblastic systems were modelled in a consistent way using L-systems, with the assumption that the age of a cell-packet end
wall plays a special role in cell determination.
This article is dedicated to Vsevelod Ya. Brodsky, doyen of Russian studies of rhythms in cell division and development, who
celebrates his 80th birthday on August 4, 2008
This article was presented in original. |
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Keywords: | Anabaena catenula Monstera deliciosa Thalassia testudinum asymmetric division cell packets heterocysts idioblasts L-systems lateral root primordia morphogenesis rhythms |
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