Document Detail

The shoot apical meristem: the dynamics of a stable structure.
MedLine Citation:
PMID:  12079669     Owner:  NLM     Status:  MEDLINE    
The shoot apical meristem (SAM) is a group of proliferating, embryonic-type cells that generates the aerial parts of the plant. SAMs are highly organized and stable structures that can function for years or even centuries. This is in apparent contradiction to the behaviour of their constituent cells, which continuously proliferate and differentiate. To reconcile the dynamic nature of the cells with the stability of the overall system the existence of elaborate signalling networks has been proposed. This is supported by recent work suggesting that the exchange of signals between cells, rather than a rigidly predetermined genetic program, is required for the establishment and functioning of an organized meristem. Together these interactions form a stable network, set up during embryogenesis, that assures the coordination of cell behaviour throughout development. Besides meristem-specific signalling cascades such as the CLAVATA receptor kinase pathway, which controls meristem size, these interactions involve plant hormones. In particular, cytokinins and auxins are implicated in the maintenance of meristem identity and phyllotaxis, respectively.
Jan Traas; Teva Vernoux
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  Philosophical transactions of the Royal Society of London. Series B, Biological sciences     Volume:  357     ISSN:  0962-8436     ISO Abbreviation:  Philos. Trans. R. Soc. Lond., B, Biol. Sci.     Publication Date:  2002 Jun 
Date Detail:
Created Date:  2002-06-24     Completed Date:  2002-12-31     Revised Date:  2010-09-14    
Medline Journal Info:
Nlm Unique ID:  7503623     Medline TA:  Philos Trans R Soc Lond B Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  737-47     Citation Subset:  IM    
INRA, Laboratoire de Biologie Cellulaire, Route de St Cyr, 78026 Versailles cedex, France.
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MeSH Terms
Angiosperms / cytology,  genetics,  ultrastructure
Flowers / physiology,  ultrastructure
Genes, Plant
Meristem / cytology,  physiology*,  ultrastructure
Plant Shoots / cytology,  physiology*

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