Editors-in-Chief:  Weilun Yin, Beijing Forestry University, China Klaus v. Gadow, University of Göttingen, Germany
Zheng Hui-quan, Lin Shan-zhi, Zhang Qian, Zhang Zhen-zhen, Zhang Zhi-yi, Lei Yang, Hou Lu. Isolation and analysis of a TIR-specific promoter from poplar[J]. Forest Ecosystems, 2007, 9(2): 95-106. DOI: 10.1007/s11632-007-0015-1
Citation: Zheng Hui-quan, Lin Shan-zhi, Zhang Qian, Zhang Zhen-zhen, Zhang Zhi-yi, Lei Yang, Hou Lu. Isolation and analysis of a TIR-specific promoter from poplar[J]. Forest Ecosystems, 2007, 9(2): 95-106. DOI: 10.1007/s11632-007-0015-1

Isolation and analysis of a TIR-specific promoter from poplar

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This study was supported by the Graduate Student Funding Program of Beijing Forestry University (Grant No. 06jjo48).

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  • Received Date: 05 January 2007
  • Rev Recd Date: 17 March 2007
  • A 5' flanking region of the well-conserved Toll/interleukin-1 receptor domain (TIR)-encoding sequence was isolated from the genomic DNA of Melampsora magnusiana
    Wagner resistant clones of hybrid triploid poplars[(Populus tomentosa
    ×P. bolleana
    P. tomentosa
    ]. Sequencing results and alignment analysis show that the obtained TIR-specific promoter (named as PtTIRp01
    ) was 1,732 bp in length; moreover 3' region of the PtTIRp01
    contains a 398 bp complete TIR-encoding sequence, which significantly corresponds to the 5' composition of TIR-NBS type gene PtDRG02
    , indicating that the obtained TIR-specific promoter region consists of 747 bp long 5' region of TIR-NBS type gene PtDRG02
    and its upstream region of promoter (985 bp). It was found that the 5' region of TIR-NBS type gene PtDRG02
    was characterized in the downstream region of the transcriptional start, named as 5'-untranslated region (5' UTR), consisting of one 93 bp 5'-untranslation exon, one 213 bp intron and one 441 bp TIR-encoding open reading frame (ORF). In addition, several putative cis
    -acting motifs were present in the obtained TIR-specific promoter of PtDRG02
    , including one TATA box, one GC-rich, one AT-rich, one P-box, one 3-AF1 binding site, two CAAT boxes, two GT-1 motifs, three typical W-boxes, four I-boxes, and one multi-cis
    -acting fragment (MCF). The latter contains five types of regulatory elements (E4, G-box, ABRE motif, box1 and HVA1s), most of which were homologous to the cis-acting regulatory elements involved in the activation of defense genes in plants. Thus, it can be suggested that TIR-specific promoter might be a pathogen-inducible promoter and be necessary for the inducible expression of defense-related genes.
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