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Transgenic poplars: expression of chimeric genes using four different constructs.

J C Leple1, A C Brasileiro, M F Michel

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Area of Science:

  • Plant Biotechnology
  • Molecular Biology
  • Genetics

Background:

  • Hybrid poplar (Populus tremula X Populus alba) explants are sensitive to Agrobacterium tumefaciens.
  • Efficient regeneration of transformed plant tissues is crucial for genetic improvement.

Purpose of the Study:

  • To establish an efficient Agrobacterium-mediated transformation protocol for hybrid poplar.
  • To evaluate the efficacy of different plant gene expression promoters in transformed poplar tissues.

Main Methods:

  • Co-cultivation of poplar leaf or stem explants with disarmed Agrobacterium tumefaciens strains.
  • Regeneration of transformed shoots using selective agents like kanamycin.
  • Comparison of gene expression levels driven by CaMV 19S, CaMV 35S, and CaMV 70 promoters.

Main Results:

  • Transformed poplar shoots were readily regenerated from explants.
  • An improved protocol utilized the nopaline disarmed strain C58/pMP90 and binary vector pBI121.
  • The CaMV 70 promoter demonstrated consistently higher gene expression levels compared to CaMV 19S and CaMV 35S promoters in callus and leaf tissues.

Conclusions:

  • An optimized Agrobacterium-mediated transformation protocol enables efficient regeneration of hybrid poplar.
  • The CaMV 70 promoter is superior for achieving high gene expression in transformed poplar, facilitating genetic studies and applications.