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First published online February 18, 2004; 10.1105/tpc.019331

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The Plant Cell 16:731-740 (2004)
© 2004 American Society of Plant Biologists

A New Arabidopsis Gene, FLK, Encodes an RNA Binding Protein with K Homology Motifs and Regulates Flowering Time via FLOWERING LOCUS C

Mi-Hye Lima,1, Joonki Kima,b,1, Youn-Sung Kima, Kyung-Sook Chunga, Yeon-Hee Seoa, Ilha Leeb, Jungmook Kimc, Choo Bong Hongb, Hie-Joon Kima and Chung-Mo Parka,2

a Graduate School of Chemistry and Molecular Engineering, Seoul National University, Seoul 151-742, Korea
b School of Biological Sciences, Seoul National University, Seoul 151-742, Korea
c Agricultural Plant Stress Research Center, Chonnam National University, Kwangju 500-507, Korea

2 To whom correspondence should be addressed. E-mail cmpark{at}snu.ac.kr; fax 82-2-889-1568.

Posttranscriptional RNA metabolism plays versatile roles in the regulation of gene expression during eukaryotic growth and development. It is mediated by a group of RNA binding proteins with distinct conserved motifs. In this study, an Arabidopsis (Arabidopsis thaliana) gene, designated FLK, was identified and shown to encode a putative RNA binding protein with K homology motifs. A mutant in which FLK was inactivated by T-DNA insertion exhibited a severe late flowering phenotype both in long and short days. The late flowering phenotype was reversed by gibberellin and vernalization treatments. The FLOWERING LOCUS C (FLC) transcription was greatly upregulated, whereas those of FLOWERING LOCUS T and SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 decreased in the mutant. These observations demonstrate that FLK regulates the autonomous flowering pathway via FLC. It is now evident that a battery of different RNA binding proteins are involved in the posttranscriptional regulation of flowering time in Arabidopsis.




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