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Related Experiment Videos

Genomic relationships between maize and its wild relatives

Takahashi1, Marshall, Bennett

  • 1Department of Information Science and Technology, Oshima National College of Maritime Technology, Yamaguchi, Japan.

Genome
|February 5, 2000
PubMed
Summary
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Genomic in situ hybridization (GISH) investigated maize

Area of Science:

  • Plant genetics
  • Genomics
  • Molecular biology

Background:

  • Maize (Zea mays) is a confirmed tetraploid, but its diploid ancestors are unknown.
  • Previous hypotheses regarding maize ancestry lack definitive evidence.

Purpose of the Study:

  • To identify the ancestral diploid species of maize using genomic in situ hybridization (GISH).
  • To investigate the evolutionary relationships between maize and its wild relatives.

Main Methods:

  • Genomic DNA from 10 wild maize relatives was used as probes.
  • Probes were hybridized to maize chromosomes using GISH.
  • Hybridization patterns were analyzed to identify ancestral genome donors.

Main Results:

Related Experiment Videos

  • Genomic DNA from Zea mays ssp. mexicana, Z. mays ssp. parviglumis, Z. diploperennis, Tripsacum dactyloides, and Coix lacryma-jobi showed dispersed hybridization signals across all maize chromosomes.
  • Zea mays ssp. mexicana, Z. mays ssp. parviglumis, Z. diploperennis, and Tripsacum dactyloides also exhibited subtelomeric signals on specific maize chromosomes.
  • Sorghum species only hybridized to the nucleolar organizer region, indicating a distant relationship.

    • Conclusions:

    • The study provides strong evidence for the ancestral donors of maize based on GISH patterns.
    • Results suggest insights into the speciation timing of Zea, Tripsacum, and Coix.
    • Taxonomic separation of tetraploid Z. perennis from diploid Z. diploperennis is supported.