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THE PLANT CELL, Vol 7, Issue 5 529-548, Copyright © 1995 by American Society of Plant Biologists
UFO: An Arabidopsis Gene Involved in Both Floral Meristem and Floral Organ Development
J. Z. Levin and E. M. Meyerowitz
Division of Biology, California Institute of Technology, 156-29, Pasadena, California 91125
We describe the role of the UNUSUAL FLORAL ORGANS (UFO) gene in Arabidopsis
floral development based on a genetic and molecular characterization of the
phenotypes of nine ufo alleles. UFO is required for the proper identity of
the floral meristem and acts in three different aspects of the process that
distinguishes flowers from shoots. UFO is involved in establishing the
whorled pattern of floral organs, controlling the determinacy of the floral
meristem, and activating the APETALA3 and PISTILLATA genes required for
petal and stamen identity. In many respects, UFO acts in a manner similar
to LEAFY, but the ufo mutant phenotype also suggests an additional role for
UFO in defining boundaries within the floral primordia or controlling cell
proliferation during floral organ growth. Finally, genetic interactions
that prevent flower formation and lead to the generation of filamentous
structures implicate UFO as a member of a new, large, and diverse class of
genes in Arabidopsis necessary for flower formation.
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