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Plant Cell Advance Online Publication
Published on December 30, 2005; 10.1105/tpc.105.038398

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Received October 3, 2005
Returned for revision November 16, 2005
Accepted December 2, 2005

APETALA2 Regulates the Stem Cell Niche in the Arabidopsis Shoot Meristem

Tobias Würschum 1, Rita Groß-Hardt 1, and Thomas Laux 1*

1 Institute of Biology III, University of Freiburg, 79104 Freiburg, Germany

* To whom correspondence should be addressed. E-mail: laux{at}biologie.uni-freiburg.de.

Postembryonic organ formation in higher plants relies on the activity of stem cell niches in shoot and root meristems where differentiation of the resident cells is repressed by signals from surrounding cells. We searched for mutations affecting stem cell maintenance and isolated the semidominant l28 mutant, which displays premature termination of the shoot meristem and differentiation of the stem cells. Allele competition experiments suggest that l28 is a dominant-negative allele of the APETALA2 (AP2) gene, which previously has been implicated in floral patterning and seed development. Expression of both WUSCHEL (WUS) and CLAVATA3 (CLV3) genes, which regulate stem cell maintenance in the wild type, were disrupted in l28 shoot apices from early stages on. Unlike in floral patterning, AP2 mRNA is active in the center of the shoot meristem and acts via a mechanism independent of AGAMOUS, which is a repressor of WUS and stem cell maintenance in the floral meristem. Genetic analysis shows that termination of the primary shoot meristem in l28 mutants requires an active CLV signaling pathway, indicating that AP2 functions in stem cell maintenance by modifying the WUS-CLV3 feedback loop.






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