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Plant Physiol, May 2001, Vol. 126, pp. 122-132
Regulation of Flowering in Arabidopsis by an FLC
Homologue
Oliver J.
Ratcliffe,
Greg C.
Nadzan,
T. Lynne
Reuber, and
José Luis
Riechmann*
Mendel Biotechnology, 21375 Cabot Boulevard, Hayward,
California 94545
The Arabidopsis FLC gene encodes a MADS domain
protein that acts as a repressor of flowering. Late-flowering
vernalization-responsive ecotypes and mutants have high steady-state
levels of FLC transcript, which decrease during the
promotion of flowering by vernalization. Therefore, FLC has a central
role in regulating the response to vernalization. We have isolated an
Arabidopsis gene, MAF1, which encodes a protein that is
closely related to FLC. Overexpression studies demonstrate that
MAF1 produces comparable effects to FLC, and likely has a similar function in the regulation of flowering. In
contrast to FLC, however, MAF1 expression
shows a less clear correlation with the vernalization response. In
addition, MAF1 overexpression does not influence
FLC transcript levels. Thus, MAF1 likely
acts downstream or independently of FLC transcription. We further report identification of a cluster of four additional FLC-like genes in the Arabidopsis genome.
*
Corresponding author; e-mail jriechmann{at}mendelbio.com; fax
510-264-0254.
© 2001 American Society of Plant Physiologists
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