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AtHAP3b Plays a Crucial Role in the Regulation of Flowering Time in Arabidopsis during Osmotic Stress

  • Chen, Nai-Zhi (State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University) ;
  • Zhang, Xiu-Qing (State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University) ;
  • Wei, Peng-Cheng (State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University) ;
  • Chen, Qi-Jun (State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University) ;
  • Ren, Fei (State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University) ;
  • Chen, Jia (State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University) ;
  • Wang, Xue-Chen (State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University)
  • Published : 2007.11.30
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Abstract

The HAP complex has been found in many eukaryotic organisms. HAP recognizes the CCAAT box present in the promoters of 30% of all eukaryotic genes. The HAP complex consists of three subunits - HAP2, HAP3 and HAP5. In this paper, we report the biological function of the AtHAP3b gene that encodes one of the HAP3 subunits in Arabidopsis. Compared with wild-type plants, hap3b-1 and hap3b-2 mutants exhibited a delayed flowering time under long-day photoperiod conditions. Moreover, the transcription levels of FT were substantially lower in the mutants than in the wild-type plants. These results imply that AtHAP3b may function in the control of flowering time by regulating the expression of FT in Arabidopsis. In a subsequent study, AtHAP3b was found to be induced by osmotic stress. Under osmotic stress conditions, the hap3b- 1 and hap3b-2 mutants flowered considerably later than the wild-type plants. These results suggest that the AtHAP3b gene plays more important roles in the control of flowering under osmotic stress in Arabidopsis.

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References

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