Sulfanilamide Regulates Flowering Time through Expression of the Circadian Clock Gene <i>LUX</i>

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  • Atsuhiro Hirohata
    Graduate School of Science and Technology, Nara Institute of Science and Technology, Takayama-Cho 8916-5, Ikoma, Nara, 630-0192 Japan
  • Yuta Yamatsuta
    Graduate School of Science and Technology, Nara Institute of Science and Technology, Takayama-Cho 8916-5, Ikoma, Nara, 630-0192 Japan
  • Kaori Ogawa
    Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Sakyo, Kyoto, 606-8501 Japan
  • Akane Kubota
    Graduate School of Science and Technology, Nara Institute of Science and Technology, Takayama-Cho 8916-5, Ikoma, Nara, 630-0192 Japan
  • Takamasa Suzuki
    College of Bioscience and Biotechnology, Chubu University, Matsumoto-cho, Kasugai, Aichi, 487-8501 Japan
  • Hanako Shimizu
    Center for Ecological Research, Kyoto University, Hirano 2-509-3, Otsu, Shiga, 520-2113 Japan
  • Yuki Kanesaka
    Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Sakyo, Kyoto, 606-8501 Japan
  • Nozomu Takahashi
    Graduate School of Science and Technology, Nara Institute of Science and Technology, Takayama-Cho 8916-5, Ikoma, Nara, 630-0192 Japan
  • Motomu Endo
    Graduate School of Science and Technology, Nara Institute of Science and Technology, Takayama-Cho 8916-5, Ikoma, Nara, 630-0192 Japan

抄録

<jats:title>Abstract</jats:title> <jats:p>Flowering time is an agriculturally important trait that can be manipulated by various approaches such as breeding, growth control and genetic modifications. Despite its potential advantages, including fine-tuning the regulation of flowering time, few reports have explored the use of chemical compounds to manipulate flowering. Here, we report that sulfanilamide, an inhibitor of folate biosynthesis, delays flowering by repressing the expression of florigen FLOWERING LOCUS T (FT) in Arabidopsis thaliana. Transcriptome deep sequencing and quantitative polymerase chain reaction analyses showed that the expression of the circadian clock gene LUX ARRYTHMO/PHYTOCLOCK1 (LUX/PCL1) is altered by sulfanilamide treatment. Furthermore, in the lux nox mutant harboring loss of function in both LUX and its homolog BROTHER OF LUX ARRHYTHMO (BOA, also named NOX), the inhibitory effect of sulfanilamide treatment on FT expression was weak and the flowering time was similar to that of the wild type, suggesting that the circadian clock may contribute to the FT-mediated regulation of flowering by sulfanilamide. Sulfanilamide also delayed flowering time in arugula (Eruca sativa), suggesting that it is involved in the regulation of flowering across Brassicaceae. We propose that sulfanilamide is a novel modulator of flowering.</jats:p>

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