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Related Experiment Videos

Variability in wheat based on low-copy DNA sequence comparisons

L E Talbert1, N K Blake, E W Storlie

  • 1Department of Plant, Soil and Environmental Science, Montana State University, Bozeman 59717, USA.

Genome
|October 1, 1995
PubMed
Summary
This summary is machine-generated.

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The wheat B genome likely originated from a single diploid ancestor, diverging after initial hybridization. DNA analysis revealed low variability, with the B genome showing more than the D genome.

Area of Science:

  • Plant genetics
  • Wheat genomics
  • Molecular evolution

Background:

  • Hexaploid wheat's B genome shows incomplete pairing with related diploid species.
  • Previous studies suggested a polyphyletic origin for the B genome from multiple diploid ancestors.
  • This polyphyletic hypothesis aimed to explain B genome divergence and wheat accession variability.

Purpose of the Study:

  • To investigate the evolutionary origin of the wheat B genome.
  • To test the polyphyletic origin hypothesis using DNA sequence comparisons.
  • To assess DNA sequence variability within the B and D genomes of wheat and its diploid relatives.

Main Methods:

  • Cloning and comparison of nucleotide sequences for three low-copy DNA fragments.
  • Analysis of DNA from B and D genomes of wheat accessions.

Related Experiment Videos

  • Comparison with DNA from diploid relatives in the Triticum genus, particularly section Sitopsis.

    • Main Results:

    • Low DNA sequence variability was observed in the analyzed wheat genomes.
    • The B genome exhibited slightly higher variability than the D genome.
    • The wheat B genome was significantly diverged from all Sitopsis diploids, with Triticum speltoides being the closest relative.
    • The D genome was highly similar to its progenitor, Triticum tauschii.

    Conclusions:

    • No evidence supported a polyphyletic origin for the wheat B genome.
    • A simpler hypothesis suggests the B genome diverged from a single diploid ancestor post-hybridization.
    • This study refines our understanding of wheat genome evolution and ancestry.