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Related Experiment Videos

MicroTom--a high-throughput model transformation system for functional genomics.

Yinghui Dan1, Hua Yan, Tichafa Munyikwa

  • 1Monsanto Company, 700 Chesterfield Parkway, Chesterfield, MO 63017, USA. ydan@vt.edu

Plant Cell Reports
|December 13, 2005
PubMed
Summary

We developed a rapid Agrobacterium-mediated transformation system for MicroTom tomatoes using NPTII and CP4 gene selections. This high-throughput method achieves high transformation frequencies, enabling efficient functional genomics studies.

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Area of Science:

  • Plant Biotechnology
  • Molecular Biology
  • Agricultural Science

Background:

  • Developing efficient plant transformation systems is crucial for crop improvement and functional genomics.
  • Agrobacterium-mediated transformation is a widely used method for generating transgenic plants.
  • MicroTom, a miniature cherry tomato variety, offers a rapid life cycle suitable for high-throughput studies.

Purpose of the Study:

  • To establish and validate a high-throughput Agrobacterium-mediated transformation model system in MicroTom tomatoes.
  • To evaluate the efficiency of two selection systems: NPTII and the CP4 (5-enolpyruvylshikimate-3-phosphate synthase) gene with glyphosate.
  • To assess the utility of this system for functional genomic analyses and gene discovery.

Main Methods:

Related Experiment Videos

  • Agrobacterium-mediated transformation of MicroTom cotyledon explants.
  • Selection of transgenic events using the NPTII antibiotic resistance gene and the CP4 glyphosate resistance gene.
  • Confirmation of stable transformation via biological assays, Southern Blot analysis, and R(1) phenotype segregation.
  • Analysis of transgene integration copy number and co-expression of multiple genes.

    • Main Results:

    • Achieved high transformation frequencies: 56% average with NPTII and 57% with CP4/glyphosate.
    • Demonstrated a strong positive correlation between stable transformation frequency and transient expression (R=0.85).
    • Confirmed stable DNA integration and germline transformation, with transgene expression observed across all plant tissues.
    • 95% of events coexpressed GUS and NPTII; 75% contained 1-2 copies of the GUS gene.

    Conclusions:

    • The developed MicroTom transformation system is efficient and high-throughput, suitable for industrial-scale production.
    • This system facilitates rapid generation of transgenic plants (2-3 months) for functional genomic studies.
    • It enables efficient identification of genes related to important agricultural traits and gene function in tomatoes.