Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Histone Deacetylase 701 (HDT701) Induces Flowering in Rice by Modulating Expression of OsIDS1

  • Cho, Lae-Hyeon (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University) ;
  • Yoon, Jinmi (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University) ;
  • Wai, Antt Htet (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University) ;
  • An, Gynheung (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University)
  • Received : 2018.03.28
  • Accepted : 2018.06.25
  • Published : 2018.07.31
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Abstract

Rice is a facultative short-day (SD) plant in which flowering is induced under SD conditions or by other environmental factors and internal genetic programs. Overexpression of Histone Deacetylase 701 (HDT701) accelerates flowering in hybrid rice. In this study, mutants defective in HDT701 flowered late under both SD and long-day conditions. Expression levels of florigens Heading date 3a (Hd3a) and Rice Flowering Locus T1 (RFT1), and their immediate upstream floral activator Early heading date 1 (Ehd1), were significantly decreased in the hdt701 mutants, indicating that HDT701 functions upstream of Ehd1 in controlling flowering time. Transcript levels of OsINDETERMINATE SPIKELET 1 (OsIDS1), an upstream repressor of Ehd1, were significantly increased in the mutants while those of OsGI and Hd1 were reduced. Chromatin-immunoprecipitation assays revealed that HDT701 directly binds to the promoter region of OsIDS1. These results suggest that HDT701 induces flowering by suppressing OsIDS1.

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References

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