The organs of a higher plant show two fundamental axes of asymmetry: proximodistal and dorsoventral. Dorsoventrality in leaves, bracts, and petal lobes of Antirrhinum majus requires activity of the PHANTASTICA (PHAN) gene. Conditional mutants revealed that PHAN is also required for earlier elaboration of the proximodistal axis. PHAN was isolated and shown… (More)
TCP transcription factors constitute a small family of plant-specific bHLH-containing, DNA-binding proteins that have been implicated in the control of cell proliferation in plants. Despite the significant role that is likely to be played by genes that control cell division in the elaboration of plant architecture, functional analysis of this family by… (More)
In angiosperms, individual lateral organs and whole flowers may develop asymmetrically along their dorsoventral axes. Dorsoventral asymmetry of Antirrhinum leaves requires activity of the Phantastica gene and other factors acting redundantly with it. We describe the effects of a mutation in the Handlebars gene, identified as an enhancer of the phantastica… (More)
cells in the central zone and cell displacement to the periphery. But how are permanent stem cells maintained in the meristem? The CLAVATA Genes Restrict Stem Cell Number The first insights into the underlying regulatory mechanisms came from studies of mutations that disrupt meri-Germany stem organization. Loss-of-function mutations in the CLAVATA1, 2 or 3… (More)
KNOX proteins are required for meristem activity in plants. Recent studies have identified potential targets of KNOX proteins, and in doing so suggested a possible mechanism for the generation of different leaf morphologies.