A new arabidopsis gene, FLK, encodes an RNA binding protein with K homology motifs and regulates flowering time via Flowering Locus C
- Lim, Mi-Hye; Kim, Joonki; Kim, Youn-Sung; Chung, Kyung-Sook; Seo, Yeon-Hee; Lee, Ilha; Kim, Jungmook; Hong, Choo Bong; Kim, Hie-Joon; Park, Chung-Mo
- Issue Date
- Plant Cell, Vol.16 No.3, pp.731-740
- 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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