... developmental transition that significantly affects the reproductive success of flowering plants. In Arabidopsis , this transition is in large part controlled by the meristem identity regulator LEAFY (LFY). The molecular mechanisms by which LFY orchestrates a precise and robust switch to flower formation...

...Eunyoung Chae; Queenie K.-G. Tan; Theresa A. Hill; Vivian F. Irish Plants flower in response to both environmental and endogenous signals. The Arabidopsis LEAFY (LFY) transcription factor is crucial in integrating these signals, and acts in part by activating the expression of multiple floral...

... regulator LEAFY (LFY) controls this switch in Arabidopsis , in part via the direct activation of two other meristem identity genes, APETALA1 ( AP1 ) and CAULIFLOWER ( CAL ). We recently identified five new direct LFY targets as candidates for the missing meristem identity regulators that act downstream...

... organs where they repress the transcription not only of class 1 knox genes but also of JAG . We also show that the BOP genes are acting together with the flower meristem identity gene LEAFY in the suppression of bract formation. These findings show that the BOP genes are important regulators...

... not grow, and thus sporophytes arising from parthenogenesis can survive and grow. * Author for correspondence (e-mail: [email protected] ) 19 1 2005 ©2005. 2005 LEAFY FLORICAULA Fertilization Zygote Physcomitrella patens Multicellular organisms begin...

...Xuelin Wu; José R. Dinneny; Katrina M. Crawford; Yoon Rhee; Vitaly Citovsky; Patricia C. Zambryski; Detlef Weigel A recent and intriguing discovery in plant biology has been that some transcription factors can move between cells. In Arabidopsis thaliana , the floral identity protein LEAFY has...

...Kirsten Bomblies; Rong-Lin Wang; Barbara A. Ambrose; Robert J. Schmidt; Robert B. Meeley; John Doebley The homologous transcription factors FLORICAULA of Antirrhinum and LEAFY of Arabidopsis share conserved roles in flower meristem identity and floral patterning. While roles for FLORICAULA/LEAFY...

...François Parcy; Kirsten Bomblies; Detlef Weigel The Arabidopsis transcription factor LEAFY acts upstream of homeotic genes such as AGAMOUS to confer floral identity on meristems that arise after the transition to reproductive development. Compared to the genetic circuitry regulating...

... we show that the floral meristem identity genes LEAFY ( LFY ) and APETALA1 ( AP1 ) are required for the activation of AP3 . The LFY transcription factor binds to a sequence, with dyad symmetry, that lies within a region of the AP3 promoter required for early expression of AP3 . Mutation...

...Dazhong Zhao; Qilu Yu; Min Chen; Hong Ma The Arabidopsis floral regulatory genes APETALA3 ( AP3 ) and PISTILLATA ( PI ) are required for the B function according to the ABC model for floral organ identity. AP3 and PI expression are positively regulated by the LEAFY ( LFY ) and UNUSUAL FLORAL ORGANS...

.../LEAFY homolog. In situ hybridisation shows that alf is expressed in the floral meristem and also in the vegetative meristem. Differences and similarities between these Petunia mutants and mutations affecting inflorescence architecture in other species will be discussed. * Author for correspondence...

...Miguel A. Blázquez; Lara N. Soowal; Ilha Lee; Detlef Weigel ABSTRACT During the initial vegetative phase, the Arabidopsis shoot meristem produces leaves with associated lateral shoots at its flanks, while the later reproductive phase is characterized by the formation of flowers. The LEAFY gene...

...Frederick D. Hempel; Detlef Weigel; M. Alejandra Mandel; Gary Ditta; Patricia C. Zambryski; Lewis J. Feldman; Martin F. Yanofsky ABSTRACT The expression of the floral regulators LEAFY, APETALA1 and AGAMOUS - LIKE8 was examined during light treatments that induced flowering in Arabidopsis...

... FLOWER 1, LEAFY, APETALA1 and APETALA2 are necessary to initiate the switch from formation of early to formation of late inflorescence nodes at the appropriate time. We have investigated the relative roles of these genes in development by isolating and characterizing new alleles of TERMINAL FLOWER 1...