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Zusammenfassung:
In Arabidopsis thaliana, major architectural changes take place during floral transition and affect many aspects of shoot development. One change, which unites Arabidopsis with the other members of the Brassicaceae family, is the suppression of leaf development in the inflorescence. We identified an Activation-tagged mutant termed bracts-1D (brx-1D) in which these leaves (bracts) develop on the inflorescence of Arabidopsis. The BRX gene belongs to a family of single C 2 H2 zinc-finger transcription factors in plants with a close homologue, BRACTS-LIKE, in Arabidopsis. Loss-of-function mutant analysis and RNAi studies show that BRX and BRL are required for the proper formation of all organs in Arabidopsis. Additional gain-of-function studies show BRX to be a floral repressor whose activity is limited by AP1 and FUL in the flower and Inflorescence, respectively. Apart from this activity, BRX also has potent affects on morphogenesis of flowers and leaves when missexpressed and is able to suppress organ boundaries and activate promiscuous growth.
