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THE PLANT CELL, Vol 9, Issue 8 1327-1338, Copyright © 1997 by American Society of Plant Biologists
FPF1 Promotes Flowering in Arabidopsis
T. Kania, D. Russenberger, S. Peng, K. Apel and S. Melzer
Swiss Federal Institute of Technology, Institute for Plant Sciences, Universitatstrasse 2, CH-8092 Zurich, Switzerland
We have characterized the gene flowering promoting factor1 (FPF1), which is
expressed in apical meristems immediately after the photoperiodic induction
of flowering in the long-day plants mustard and Arabidopsis. In early
transition stages, expression is only detectable in the peripheral zone of
apical meristems; however, later on, it can also be found in floral
meristems and in axillary meristems that form secondary inflorescences. The
FPF1 gene encodes a 12.6-kD protein that has no homology to any previously
identified protein of known function. Constitutive expression of the gene
in Arabidopsis under control of the cauliflower mosaic virus 35S promoter
resulted in a dominant heritable trait of early flowering under both short-
and long-day conditions. Treatments with gibberellin (GA) and
paclobutrazol, a GA biosynthesis inhibitor, as well as crosses with
GA-deficient mutants indicate that FPF1 is involved in a GA-dependent
signaling pathway and modulates a GA response in apical meristems during
the transition to flowering.
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