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Isolation and Characterization of a cDNA Encoding Two Novel Heat-shock Factor OsHSF6 and OsHSF12 in Oryza Sativa L.

  • Liu, Jin-Ge (Agro-Biotechnology Research Center of Shanghai Academy of Agricultural Sciences, Department of Horticulture, Nanjing Agricultural University) ;
  • Yao, Quan-Hong (Agro-Biotechnology Research Center of Shanghai Academy of Agricultural Sciences) ;
  • Zhang, Zhen (Department of Horticulture, Nanjing Agricultural University) ;
  • Peng, Ri-He (Agro-Biotechnology Research Center of Shanghai Academy of Agricultural Sciences) ;
  • Xiong, Ai-Sheng (Agro-Biotechnology Research Center of Shanghai Academy of Agricultural Sciences) ;
  • Xu, Fang (Agro-Biotechnology Research Center of Shanghai Academy of Agricultural Sciences) ;
  • Zhu, Hong (Agro-Biotechnology Research Center of Shanghai Academy of Agricultural Sciences)
  • Published : 2005.09.30
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Abstract

As a crucial transcription factor family, heat-shock factors were mainly analyzed and characterized in tomato and Arabidopsis. In this study, we isolated two putative heat shock factors OsHSF6 and OsHSF12 that interact specifically with heat-shock element (HSE) from Oryza sativa L by yeast one-hybrid method. The full-length cDNA of OsHSF6 and OsHSF12 have 1074bp and 920bp open reading frame (ORF), respectively. Analysis of the deduced amino acid sequences revealed that OsHSF6 was a class A heat shock factor (HSF) with all the conserved sequence elements characteristic of heat stress transcription factor, while OsHSF12 was a class B HSF with C-terminal domain (CTD) lacking of AHA motif. Bioinformatic analysis showed that the sequences and structures of two HSFs' DNA binding domain (DBD) had a high similarity with LpHSF24. The results of RT-PCR indicated OsHSF6 gene was expressed immediately after rice plants exposure to heat stress, and the transcription of OsHSF6 gene accumulated primarily in immature seeds, roots and leaves. However, we did not find the transcription of OsHSF12 gene in different organs and growth periods. Our results implied that OsHSF6 might be function as a HSF regulating early expression of stress genes in response to heat shock, and OsHSF12 might be act as a synergistic factor to regulate the expression of down-stream genes.

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References

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