Plant Cell Advance Online Publication Published on March 28, 2003; 10.1105/tpc.009506
Received December 3, 2002
Accepted February 17, 2003
Analysis of the Arabidopsis MADS AFFECTING FLOWERING Gene Family: MAF2
Prevents Vernalization by Short Periods of Cold
Oliver J. Ratcliffe 1*, Roderick W. Kumimoto 1, Becky J. Wong 1, and José Luis Riechmann 1
1 Mendel Biotechnology, Inc., Hayward, California 94545
* To whom correspondence should be addressed. E-mail: oratclif{at}mendelbio.com.
The Arabidopsis FLOWERING LOCUS C (FLC) gene is a key floral repressor
in the maintenance of a vernalization response. In vernalization-sensitive genetic
backgrounds, FLC levels are high, and they decline after exposure to long
cold periods. Four FLC paralogs (MAF2 [MADS AFFECTING FLOWERING2
] to MAF5) are arranged in a tandem array on the bottom of Arabidopsis
chromosome V. We used a reverse genetics approach to analyze their functions. Loss-of-function
and gain-of-function studies indicate that MAF2 acts as a floral repressor.
In particular, maf2 mutant plants display a pronounced vernalization response
when subjected to relatively short cold periods, which are insufficient to elicit
a strong flowering response in the wild type, despite producing a large reduction
in FLC levels. MAF2 expression is less sensitive to vernalization
than that of FLC, and its repressor activity is exerted independently or
downstream of FLC transcription. Thus, MAF2 can prevent premature
vernalization in response to brief cold spells. Overexpression of MAF3 or
MAF4 produces alterations in flowering time that suggest that these genes
also act as floral repressors and might contribute to the maintenance of a vernalization
requirement. However, the final gene in the cluster, MAF5, is upregulated
by vernalization. Therefore, MAF5 could play an opposite role to FLC
in the vernalization response.
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