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Genetic Analysis of Kernel Traits in Maize-Teosinte Introgression Populations.

Zhengbin Liu1, Arturo Garcia2, Michael D McMullen3

  • 1Division of Plant Sciences, University of Missouri, Columbia, Missouri 65211.

G3 (Bethesda, Md.)
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Summary

Maize kernel weight increased tenfold since domestication. Researchers identified genetic regions (QTL) for kernel size and shape, revealing complex interactions that influenced this significant domestication trait.

Keywords:
MPPMultiparent Advanced Generation Inter-Cross (MAGIC)domesticationintrogression populationkernel size and shapekernel weightmultiparental populationsquantitative trait loci (QTL)

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Area of Science:

  • Plant genetics
  • Crop domestication
  • Agricultural science

Background:

  • Human selection targeted seed traits for increased food content during the shift to agriculture.
  • Seed size/weight was a primary trait under selection, directly impacting grain yield.
  • Seed shape also likely contributed to increased grain size.

Purpose of the Study:

  • To investigate the genetic basis of maize kernel weight increase.
  • To analyze how kernel size and shape traits contribute to kernel weight.
  • To identify quantitative trait loci (QTL) associated with kernel domestication.

Main Methods:

  • Analysis of kernel morphometric traits in maize-teosinte introgression populations.
  • Utilized digital imaging software for trait analysis.
  • Employed quantitative trait loci (QTL) mapping.

Main Results:

  • Identified QTL for kernel area and length with moderate effects, colocalizing with kernel weight QTL.
  • Detected genomic regions with strong effects on maize domestication.
  • Characterized a genetic framework for kernel traits involving complex pleiotropic interactions.

Conclusions:

  • Confirmed previously reported kernel domestication loci.
  • Discovered novel QTL influencing kernel traits with varying allelic effects.
  • Provided a genetic framework for future research on maize kernel evolution.