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Modulation of sugar metabolism by an INDETERMINATE DOMAIN transcription factor contributes to photoperiodic flowering in Arabidopsis

Cited 96 time in Web of Science Cited 102 time in Scopus
Authors
Seo, Pil Joon; Ryu, Jaeyong; Kang, Seok Ki; Park, Chung-Mo
Issue Date
2011-02
Citation
Plant Journal, Vol.65 No.3, pp.418-429
Keywords
INDETERMINATE DOMAINfloweringsugar metabolismsucrose synthasesucrose transporterArabidopsis
Abstract
P>There has been a long-standing interest in the role played by sugars in flowering. Of particular interest is how sugar-related signals are integrated into flowering genetic pathways. Here, we demonstrate that the INDETERMINATE DOMAIN transcription factor AtIDD8 regulates photoperiodic flowering by modulating sugar transport and metabolism. We found that whereas AtIDD8-deficient idd8 mutants exhibit delayed flowering under long days, AtIDD8-overexpressing plants (35S:IDD8) show early flowering. In addition, the sucrose synthase genes SUS1 and SUS4 were upregulated in 35S:IDD8 plants but downregulated in idd8 mutants, in which endogenous sugar levels were altered. AtIDD8 activates the SUS4 gene by binding directly to its promoter, resulting in promoted flowering in SUS4-overexpressing plants. SUS4 expression also responds to photoperiodic signals. Notably, the AtIDD8 gene is suppressed by sugar deprivation. Therefore, we conclude that AtIDD8 regulation of sugar transport and metabolism is linked to photoperiodic flowering.
ISSN
0960-7412
URI
https://hdl.handle.net/10371/172045
DOI
https://doi.org/10.1111/j.1365-313X.2010.04432.x
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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