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THE PLANT CELL, Vol 5, Issue 3 297-309, Copyright © 1993 by American Society of Plant Biologists
The Patterns of Gene Expression in the Tomato Shoot Apical Meristem
A. J. Fleming, T. Mandel, I. Roth and C. Kuhlemeier
Institute of Plant Physiology, University of Berne, Altenbergrain 21, CH-3013 Berne, Switzerland
In this paper, we describe the synthesis of a cDNA library from the
vegetative shoot apical meristem and the analysis of clones selected from
it. Using in situ hybridization, we characterized the patterns of
expression of these genes in the tomato shoot apical meristem, as well as
the patterns obtained from other sources. The results from the analysis of
15 cDNAs indicated the following six main patterns of gene expression in
the shoot apical meristem: overall expression, zero expression, expression
limited to the epidermis, expression excluded from the epidermis, punctate
expression, and expression elevated in the flanks of the meristem. The
patterns observed and the nature and number of the genes showing these
patterns necessitate a reinterpretation of the models of meristem structure
and function. In particular, the data suggest a compartmentation within the
shoot apical meristem based on the spatial expression of particular subsets
of genes. This paper also reports on the specific and precise criteria
essential for the correct identification of meristem-specific gene
expression. The data give new insight into the molecular organization of
the shoot apical meristem and provide the framework for a detailed
dissection of the factors controlling this organization.
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