ibclogo XVI International Botanical Congess


Abstract Number: 3719
Poster No. = 486


CELL CYCLE REGULATION IN THE SHOOT APICAL MERISTEM OF ARABIDOPSIS


P. Laufs *, O. Grandjean, C. Jonak, K. Kiêu & J. Traas, INRA, 78026 Versailles Cedex, France *Present address: John Innes Centre, NR4 7UH, Norwich, UK


The shoot apical meristem (SAM) is formed by a small number of dividing cells. Mutants potentially affecting cell cycle control in the SAM have been described in several species, including Arabidopsis thaliana. Unfortunately, no precise description of mitotic activity in wild-type or mutant Arabidopsis has been reported. Using confocal laser microscopy and image analysis, we have analyzed the spatial regulation of mitotic activity within vegetative and inflorescence wild-type meristems of Arabidopsis. This frame of reference was then used to analyze several mutants affected in meristem development including clv3, mgo2 and pin1. We show that in these mutants the spatial regulation of mitotic activity is affected in different ways.


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