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Progressive heterosis in genetically defined tetraploid maize.

Jacob D Washburn1, Mitchell J McElfresh1, James A Birchler1

  • 1Division of Biological Sciences, University of Missouri, 311 Tucker Hall, Columbia, MO, 65211, USA.

Journal of Genetics and Genomics = Yi Chuan Xue Bao
|August 25, 2019
PubMed
Summary

Progressive heterosis enhances hybrid vigor in tetraploid maize, boosting biomass. This study observed significant increases in dry weight for double-cross tetraploids, suggesting potential for crop improvement.

Keywords:
Dominance complementationHeterosisMaizeProgressive heterosisTetraploid

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Area of Science:

  • Plant genetics
  • Crop science
  • Agricultural biotechnology

Background:

  • Progressive heterosis, an amplified hybrid vigor in double-cross tetraploids, is observed in various crops.
  • This phenomenon, where double-cross hybrids exceed single-cross parents in vigor, is not fully understood at the molecular level.

Purpose of the Study:

  • To investigate progressive heterosis in artificially induced tetraploid maize.
  • To quantify the biomass enhancement associated with this phenomenon.
  • To explore the genetic basis of tetraploid progressive heterosis.

Main Methods:

  • Generation of tetraploid maize lines and their diploid counterparts.
  • Creation of single-cross and double-cross hybrids.
  • Four-year field-based phenotyping for above-ground dry weight.
  • Whole-genome resequencing and bioinformatic analysis.

Main Results:

  • Double-cross tetraploid hybrids exhibited a strong progressive heterosis phenotype.
  • Above-ground dry weight was 34% greater in double-cross tetraploids than single-cross tetraploids.
  • Above-ground dry weight was 56% greater in double-cross tetraploids than diploid counterparts.
  • Genetic analysis did not support a complete recessive complementation model for tetraploid heterosis.

Conclusions:

  • Progressive heterosis is a real phenomenon in tetraploid maize, significantly increasing biomass.
  • This finding has implications for enhancing crop yield and biomass production.
  • Further research is needed to elucidate the molecular mechanisms underlying tetraploid progressive heterosis.