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Related Experiment Videos

Positive selection.

Allan Wenck1, Geneviève Hansen

  • 1BASF Plant Sciences L.L.C., BASF Corporation, Research Triangle Park, USA.

Methods in Molecular Biology (Clifton, N.J.)
|August 18, 2004
PubMed
Summary

Positive selection offers a novel plant transformation method, enabling transformed cells to utilize new substrates for growth. This approach avoids toxic compounds, enhancing transformation efficiency in various plant species.

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Area of Science:

  • Plant biotechnology
  • Molecular biology
  • Genetics

Background:

  • Traditional plant transformation relies on negative selection using antibiotics or herbicides.
  • Negative selection can inhibit the growth of desirable transformed cells due to toxic byproducts.
  • A more efficient selection method is needed to improve plant transformation success rates.

Purpose of the Study:

  • To introduce and explain the concept of positive selection in plant transformation.
  • To highlight the advantages of positive selection over traditional negative selection methods.
  • To present phosphomannose isomerase as an effective positive selection marker.

Main Methods:

  • Utilizing a selectable marker gene that confers a new metabolic capability to transformed cells.
  • Employing substrates that only transformed cells can efficiently metabolize, leading to their selective growth.
  • Demonstrating the use of phosphomannose isomerase and mannose-containing media for selection.

Main Results:

  • Positive selection allows transformed cells to utilize previously unusable substrates for growth.
  • Transformed cells outcompete non-transformed cells, which grow slowly or not at all.
  • This method avoids the production of inhibitory phenolic compounds often seen in negative selection.

Conclusions:

  • Positive selection is a versatile and effective strategy for plant transformation across diverse species.
  • It enhances transformation efficiency by promoting the growth of transformed cells.
  • The phosphomannose isomerase system serves as a practical example of successful positive selection.

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