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First published online April 24, 2009
doi: 10.1242/10.1242/dev.035436

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Floral stem cell termination involves the direct regulation of AGAMOUS by PERIANTHIA

Toshiro Ito^1,3, Frank Wellmer^1,4, Teva Vernoux², Annick Dedieu², Jan Traas² and Elliot M. Meyerowitz^1,*

¹ Division of Biology 156-29, California Institute of Technology, Pasadena, California 91125, USA.
² Laboratoire RDP, Ecole Normale Supérieure de Lyon, 46 allée d'Italie, 69007 Lyon, France.
³ Temasek Life Sciences Laboratory, National University of Singapore, Singapore 117604, Singapore.
⁴ Smurfit Institute of Genetics, Trinity College Dublin, College Green, Dublin 2, Ireland.

^* Author for correspondence (e-mail: pradeep.das{at}ens-lyon.fr)

^* Author for correspondence (e-mail: meyerow{at}its.caltech.edu)

Accepted 16 March 2009

SUMMARY

In Arabidopsis, the population of stem cells present in young flower buds is lost after the production of a fixed number of floral organs. The precisely timed repression of the stem cell identity gene WUSCHEL (WUS) by the floral homeotic protein AGAMOUS (AG) is a key part of this process. In this study, we report on the identification of a novel input into the process of floral stem cell regulation. We use genetics and chromatin immunoprecipitation assays to demonstrate that the bZIP transcription factor PERIANTHIA (PAN) plays a role in regulating stem cell fate by directly controlling AG expression and suggest that this activity is spatially restricted to the centermost region of the AG expression domain. These results suggest that the termination of floral stem cell fate is a multiply redundant process involving loci with unrelated floral patterning functions.

Key words: AGAMOUS, Flower development, Stem cells, Arabidopsis

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PANning for AG

Development 2009 136: e1001. [Full Text]  

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