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Spontaneous hybridization between maize and teosinte.

Norman C Ellstrand1, Lauren C Garner, Subray Hegde

  • 1Department of Botany and Plant Sciences, Center for Conservation Biology, and Biotechnology Impacts Center, University of California, Riverside, CA 92521-0124, USA. ellstrand@ucr.edu

The Journal of Heredity
|April 3, 2007
PubMed
Summary
This summary is machine-generated.

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Maize naturally hybridizes with teosinte taxa. Zea mays ssp. parviglumis showed high hybridization rates (>50%), while Zea mays ssp. mexicana showed low rates (<1%).

Area of Science:

  • Botany and Plant Science
  • Evolutionary Biology
  • Genetics

Background:

  • Maize (Zea mays ssp. mays) is closely related to teosinte, its wild ancestor.
  • Natural hybridization between maize and teosinte taxa can occur when they grow in proximity.

Purpose of the Study:

  • To quantify spontaneous hybridization rates between maize and two teosinte taxa: Zea mays ssp. mexicana and Zea mays ssp. parviglumis.
  • To understand the evolutionary dynamics of maize-teosinte hybrid swarms.

Main Methods:

  • Field experiments were conducted by planting teosinte within and near maize fields.
  • Hybrid identification involved progeny testing for specific genetic markers (herbicide resistance allele, allozyme allele).
  • Morphological evaluation of mature hybrid progeny confirmed maize x teosinte hybrid characteristics.

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Main Results:

  • Maize and Zea mays ssp. mexicana exhibited low natural hybridization rates (<1%).
  • Maize and Zea mays ssp. parviglumis demonstrated high natural hybridization rates (>>50%).

Conclusions:

  • Hybridization rates vary significantly between different teosinte taxa and maize.
  • Zea mays ssp. parviglumis is a significant contributor to maize-teosinte hybrid swarms.
  • Understanding these rates is crucial for crop evolution and conservation strategies.