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Vol. 14, No. 18, pp. 2366-2376, September 15, 2000
1 School of Biological Sciences and Research Center for
Cell Differentiation, Seoul National University, Seoul, 151-742, Korea;
2 Plant Biology Laboratory, The Salk Institute for Biological
Studies, La Jolla, California 92037, USA
The very late-flowering behavior of Arabidopsis
winter-annual ecotypes is conferred mainly by two genes,
FRIGIDA (FRI) and FLOWERING LOCUS C
(FLC). A MADS-domain gene, AGAMOUS-LIKE 20 (AGL20), was identified as a dominant FRI suppressor in
activation tagging mutagenesis. Overexpression of AGL20
suppresses not only the late flowering of plants that have functional
FRI and FLC alleles but also the delayed phase
transitions during the vegetative stages of plant development.
Interestingly, AGL20 expression is positively regulated not
only by the redundant vernalization and autonomous pathways of
flowering but also by the photoperiod pathway. Our results indicate
that AGL20 is an important integrator of three pathways
controlling flowering in Arabidopsis.
[Key Words: Flowering; MADS domain protein; AGL20; phase transition; activation tagging]
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