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The genetics of maize evolution.

John Doebley1

  • 1Laboratory of Genetics, University of Wisconsin, Madison, Wisconsin 53706, USA. jdoebley@wisc.edu

Annual Review of Genetics
|December 1, 2004
PubMed
Summary

Maize evolved from teosinte through genetic changes affecting its ear morphology. Identifying key genes controlling these traits is crucial for understanding maize domestication and its wild relatives.

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Area of Science:

  • Plant genetics
  • Evolutionary biology
  • Agricultural science

Background:

  • Maize (Zea mays) and teosinte exhibit significant differences in female inflorescence (ear) morphology.
  • Despite morphological divergence, some teosintes are cytologically similar to maize and can produce fertile hybrids.

Purpose of the Study:

  • To identify the genetic basis of morphological differences between maize and teosinte.
  • To understand the key genetic innovations during maize domestication from teosinte.

Main Methods:

  • Molecular analyses to determine maize progenitor.
  • Inheritance analyses of morphological traits.
  • Quantitative trait locus (QTL) mapping.

Main Results:

  • Zea mays ssp. parviglumis identified as the progenitor of maize.
  • Morphological traits are controlled by multiple genes with quantitative inheritance.
  • A few major-effect loci identified as key innovations in maize domestication.

Conclusions:

  • Maize domestication involved multiple genes, with some major effect loci driving significant morphological changes.
  • Further research is needed to identify all contributing genes, their polymorphisms, and their combined effects in transforming teosinte into maize.

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