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Related Experiment Videos

Pollen selection: a transgenic reconstruction approach.

A Touraev1, C S Fink, E Stöger

  • 1Vienna Biocenter, Institute of Microbiology and Genetics, University of Vienna, Vienna, Austria.

Proceedings of the National Academy of Sciences of the United States of America
|December 19, 1995
PubMed
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Male gametophytic selection effectively enhances gene transmission to the next generation. This method allows for 100% transgenic offspring by selecting for desired genes in pollen.

Area of Science:

  • Plant genetics
  • Molecular biology
  • Reproductive biology

Background:

  • Gene transmission to offspring is crucial for genetic studies and crop improvement.
  • Traditional breeding methods can be limited by segregation and recombination.
  • Gametophytic selection offers a potential strategy to overcome these limitations.

Purpose of the Study:

  • To investigate the feasibility of male gametophytic selection for enhancing gene transmission in plants.
  • To demonstrate the effectiveness of selecting for a specific gene in pollen to influence progeny genotypes.

Main Methods:

  • A transgenic tobacco model was developed with a hygromycin-resistance gene (hpt) under a constitutive promoter.
  • Pollen was subjected to in vitro selection using hygromycin to isolate resistant gametophytes.

Related Experiment Videos

  • Wild-type plants were pollinated with selected pollen, and offspring were screened for a linked kanamycin-resistance gene.

    • Main Results:

    • In vitro maturation of transgenic pollen in hygromycin medium reduced germination by 50%, consistent with meiotic segregation.
    • Pollination with selected pollen resulted in 100% transgenic offspring, confirmed by kanamycin resistance.
    • This demonstrates successful selection at the male gametophyte stage.

    Conclusions:

    • Male gametophytic selection is a viable strategy to increase the frequency of desired genes in the subsequent sporophytic generation.
    • This technique provides direct proof of altering progeny gene frequencies through gametophyte selection.
    • The findings have implications for accelerating genetic engineering and breeding programs.