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THE PLANT CELL, Vol 9, Issue 11 1921-1934, Copyright © 1997 by American Society of Plant Biologists
Different Roles of Flowering-Time Genes in the Activation of Floral Initiation Genes in Arabidopsis
L. Ruiz-Garcia, F. Madueno, M. Wilkinson, G. Haughn, J. Salinas and J. M. Martinez-Zapater
Departamento de Biologia Molecular y Virologia Vegetal, Centro de Investigacion y Tecnologia, Instituto Nacional de Investigacion y Tecnologia Agraria y Alimentaria, Carretera de La Coruna km 7, 28040 Madrid, Spain
We have analyzed double mutants that combine late-flowering mutations at
four flowering-time loci (FVE, FPA, FWA, and FT) with mutations at the
LEAFY (LFY), APETALA1 (AP1), and TERMINAL FLOWER1 (TFL1) loci involved in
the floral initiation process (FLIP). Double mutants between ft-1 or fwa-1
and lfy-6 completely lack flowerlike structures, indicating that both FWA
and FT act redundantly with LFY to control AP1. Moreover, the phenotypes of
ft-1 ap1-1 and fwa-1 ap1-1 double mutants are reminiscent of the phenotype
of ap1-1 cal-1 double mutants, suggesting that FWA and FT could also be
involved in the control of other FLIP genes. Such extreme phenotypes were
not observed in double mutants between fve-2 or fpa-1 and lfy-6 or ap1-1.
Each of these showed a phenotype similar to that of ap1-1 or lfy-6 mutants
grown under noninductive photoperiods, suggesting a redundant interaction
with FLIP genes. Finally, the phenotype of double mutants combining the
late-flowering mutations with tfl1-2 were also consistent with the
different roles of flowering-time genes.
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