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First published online September 9, 2005; 10.1105/tpc.105.035485

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The Plant Cell 17:2647-2660 (2005)
© 2005 American Society of Plant Biologists

SUPPRESSOR OF FRIGIDA3 Encodes a Nuclear ACTIN-RELATED PROTEIN6 Required for Floral Repression in Arabidopsis{boxw}

Kyuha Choia,1, Sanghee Kima,1, Sang Yeol Kima,b, Minsoo Kima, Youbong Hyuna, Horim Leea, Sunghwa Choea, Sang-Gu Kima, Scott Michaelsb and Ilha Leea,c,2

a Department of Biological Sciences, Seoul National University, Seoul 151-742, Korea
b Department of Biology, Indiana University, Bloomington, Indiana 47405
c Plant Metabolism Research Center, Kyung Hee University, Suwon 449-701, Korea

2 To whom correspondence should be addressed. E-mail ilhalee{at}snu.ac.kr; fax 82-2-872-1993.

Flowering traits in winter annual Arabidopsis thaliana are conferred mainly by two genes, FRIGIDA (FRI) and FLOWERING LOCUS C (FLC). FLC acts as a flowering repressor and is regulated by multiple flowering pathways. We isolated an early-flowering mutant, suppressor of FRIGIDA3 (suf3), which also shows leaf serration, weak apical dominance, and infrequent conversion of the inflorescence shoot to a terminal flower. The suf3 mutation caused a decrease in the transcript level of FLC in both a FRI-containing line and autonomous pathway mutants. However, suf3 showed only a partial reduction of FLC transcript level, although it largely suppressed the late-flowering phenotype. In addition, the suf3 mutation caused acceleration of flowering in both 35S-FLC and a flc null mutant, indicating that SUF3 regulates additional factor(s) for the repression of flowering. SUF3 is highly expressed in the shoot apex, but the expression is not regulated by FRI, autonomous pathway genes, or vernalization. SUF3 encodes the nuclear ACTIN-RELATED PROTEIN6 (ARP6), the homolog of which in yeast is a component of an ATP-dependent chromatin-remodeling SWR1 complex. Our analyses showed that SUF3 regulates FLC expression independent of vernalization, FRI, and an autonomous pathway gene, all of which affect the histone modification of FLC chromatin. Subcellular localization using a green fluorescent protein fusion showed that Arabidopsis ARP6 is located at distinct regions of the nuclear periphery.


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