..., WUSCHEL and AGAMOUS . The phenotype was also dependent on growth conditions. Together, these results highlight the surprisingly plastic nature of stem cell maintenance in plants and its dependence on Paf1c. References Alemu , E. Y. , Carl , J. W. , Corrada Bravo , H. and Hannenhalli...

... in a combinatorial manner to control proper floral organ identity. The A-class gene APETALA2 ( AP2 ) promotes sepal and petal identities in whorls 1 and 2 and restricts the expression of the C-class gene AGAMOUS ( AG ) from whorls 1 and 2. However, it is unknown how AP2 performs these functions. Unlike the other...

...Heike Wollmann; Erica Mica; Marco Todesco; Jeff A. Long; Detlef Weigel The ABC model of flower development explains how three classes of homeotic genes confer identity to the four types of floral organs. In Arabidopsis thaliana, APETALA2 ( AP2 ) and AGAMOUS ( AG ) represent A- and C-class genes...

... 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...

...Annette T. Maier; Sandra Stehling-Sun; Heike Wollmann; Monika Demar; Ray L. Hong; Silke Haubeiß; Detlef Weigel; Jan U. Lohmann Flowers develop from floral meristems, which harbor stem cells that support the growth of floral organs. The MADS domain transcription factor AGAMOUS (AG)plays a central...

... gene AGAMOUS ( AG ) terminates meristem activity and promotes development of stamens and carpels. To understand the program of gene expression activated by AG , we followed genome-wide expression during early stamen and carpel development. The AG target genes included most genes for which mutant...

.... Ovule development was disrupted in all flowers, resulting in complete female sterility. Molecular analysis of the mutant plants revealed that AtMSI1 is required to maintain the correct temporal and organ-specific expression of homeotic genes, including AGAMOUS and APETALA2 . In contrast, FAS1 and FAS2...

... showed that HEN1 , like the C function gene AGAMOUS , acts to specify reproductive organ identities and to repress A function. HEN1 also shares AG ’s non-homeotic function in controlling floral determinacy. HEN1 may achieve these functions by regulating the expression of AG . hen1 single mutants exhibit...

...Robert G. Franks; Chunxin Wang; Joshua Z. Levin; Zhongchi Liu Proper regulation of homeotic gene expression is critical for pattern formation during both animal and plant development. A negative regulatory mechanism ensures that the floral homeotic gene AGAMOUS is only expressed in the center...

... and L3 contribute, to different degrees, to the mesophyll and other internal tissues. In order to test the roles of the floral homeotic genes in regulating these patterns of cell proliferation, we carried out similar clonal analyses in apetala3-3 and agamous-1 mutant plants. Our results suggest that cell...

... from, carpel development, and that their action is negatively regulated by A and B organ identity genes. The third carpel gene studied, AGAMOUS , encodes C function that has been proposed to fully specify carpel identity. When AGAMOUS function is removed together with the A class gene APETALA2...

.... We examined whether the function of the flower developmental control gene AGAMOUS involves communication across these layers. We developed a mosaic strategy using the Cre/ loxP site-specific recombinase system, and identified the sector structure for mosaics that produced mutant flowers. The major...