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Plant Cell Reports

, Volume 26, Issue 12, pp 2091–2099 | Cite as

Expression and functional analysis of ZmDWF4, an ortholog of Arabidopsis DWF4 from maize (Zea mays L.)

  • Tingsong Liu
  • Jinpeng Zhang
  • Maoyan Wang
  • Zhangying Wang
  • Guifen Li
  • Lin Qu
  • Guoying Wang
Genetic Transformation and Hybridization

Abstract

DWF4 encodes a rate-limiting mono-oxygenase that mediates 22α-hydroxylation reactions in the BR biosynthetic pathway and it is the target gene in the BR feedback loop. Knockout of DWF4 results in a dwarfed phenotype and other severe defects in Arabidopsis. Here we report on the isolation of the ZmDWF4 gene in maize. Sequence analysis revealed that the open reading frame of ZmDWF4 was 1,518 bp, which encodes a protein composed of 505 amino acid residues with a calculated molecular mass of 57.6 kD and a predicated isoelectric point (pI) of 9.54. Phylogenetic analysis indicated that ZmDWF4 was very close to the Arabidopsis DWF4. In young maize seedlings, the expression of ZmDWF4 in shoots was much higher than that in roots. The highest expression of ZmDWF4 was observed in husk leaves and the lowest in silks during flowering stage. The expression of ZmDWF4 in maize was significantly down regulated by exogenous brassinolide. A heterogeneous complementary experiment demonstrated that the defects of three Arabidopsis DWF4 mutants could be rescued by constitutive expression of ZmDWF4, with leaf expandability, inflorescence stem heights and fertile capabilities all restored to normal levels. Increases in seed and branch number as well as the height of florescence stem were observed in the over-expressed transformants. These findings suggest that ZmDWF4 may be an ortholog gene of Arabidopsis DWF4 and responsible for BR biosynthesis in maize.

Keywords

Brassinosteroids ZmDWF4 Expression pattern Maize 

Notes

Acknowledgments

This work was supported by the National High-tech Program of China (2006AA10A106).

Supplementary material

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Tingsong Liu
    • 1
  • Jinpeng Zhang
    • 1
  • Maoyan Wang
    • 1
  • Zhangying Wang
    • 1
  • Guifen Li
    • 1
    • 2
  • Lin Qu
    • 1
  • Guoying Wang
    • 1
    • 2
  1. 1.State Key Laboratory of Agrobiotechnology and National Center for Plant Gene Research (Beijing)China Agricultural UniversityBeijingChina
  2. 2.Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijingChina

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