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In vivo haploid induction in maize.

J. Eder1, S. Chalyk

  • 1Bavarian State Institute for Agronomy, Vöttinger Strasse 38, 85316 Freising, Germany. joachim.eder@lbp.bayern.de

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|February 13, 2003
PubMed
Summary

Maternal haploid induction in maize using specific lines (MHI and M741H) yielded haploids across various genotypes. This maize breeding technique shows significant potential for genetic improvement and crop development.

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Area of Science:

  • Plant genetics
  • Maize breeding
  • Haploid induction

Background:

  • Maternal haploid induction is a key technique in plant breeding.
  • Developing efficient methods for maize haploid production is crucial for genetic improvement.
  • Previous research has explored various methods for inducing haploidy in maize.

Purpose of the Study:

  • To evaluate the efficacy of two haploid-inducing lines (MHI and M741H) for maternal haploid production in maize.
  • To assess the influence of different maize genotypes (dent, flint, flintxdent) on haploid induction frequency.
  • To determine the success rate of chromosome doubling and subsequent seed production from haploid plants.

Main Methods:

  • Utilized two specific haploid-inducing lines, MHI and M741H.
  • Produced maternal haploids from dent, flint, and flintxdent maize genotypes.
  • Applied colchicine treatment for chromosome doubling of haploid seedlings.
  • Evaluated pollen fertility, self-pollination capability, and seed set in doubled haploid plants.
  • Tested synthetic populations improved by haploid sib recurrent selection in field trials.

Main Results:

  • Haploids were successfully obtained from all tested maternal maize genotypes.
  • Maternal genotype significantly influenced haploid induction frequency, ranging from 2.7% to 8.0%.
  • Chromosome doubling resulted in 49.4% of haploid plants producing fertile pollen, 39.0% capable of selfing, and 27.3% producing seeds after selfing.

Conclusions:

  • Maternal haploid induction is a viable strategy for maize breeding.
  • The choice of maternal genotype significantly impacts haploid induction efficiency.
  • Haploid-derived populations show promise for genetic improvement in maize breeding programs.

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