The HDA9‐HY5 module epigenetically regulates flowering time in Arabidopsis thaliana

May 2, 2022Journal of cellular physiology

The HDA9-HY5 system controls flowering time in Arabidopsis through epigenetic regulation

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Abstract

The hda9-1 hy5-215 double mutant flowered earlier than each single mutant.

  • Both hda9-1 and hy5-215 single mutants flowered earlier than the wild-type Col-0.
  • Positive flowering time genes were upregulated in the hda9-1, hy5-215, and hda9-1 hy5-215 mutants.
  • HDA9 and HY5 were shown to bind directly to the promoter regions of PIF4 and COL5.
  • The expression of PIF4 and COL5 was repressed through specific modifications to histones.

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