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Optimized protocol for high-throughput vernalization with speed breeding in winter wheat.

Rishap Dhakal1, Pablo Sandro1, Lucía Gutiérrez2

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|December 2, 2025
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Summary
This summary is machine-generated.

Speed breeding (SB) combined with high-throughput vernalization and shallow planting significantly reduces winter wheat breeding cycles by 22 days per generation. This optimized protocol accelerates genetic gain for wheat varieties with high vernalization needs.

Keywords:
High-throughput vernalizationShallow plantingSpeed breedingWinter wheat

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Area of Science:

  • Agricultural Science
  • Plant Science
  • Genetics

Background:

  • Global wheat demand is rising, necessitating increased production through plant breeding.
  • Speed breeding (SB) offers a method to accelerate genetic gain by shortening crop breeding cycles.
  • Existing SB protocols for winter wheat require optimization for specific regional vernalization needs, particularly in the US Midwest.

Purpose of the Study:

  • To develop an optimized speed breeding protocol for winter wheat accommodating diverse vernalization requirements.
  • To evaluate the impact of vernalization temperature and sowing depth on winter wheat flowering time under SB conditions.
  • To enhance the efficiency of wheat breeding programs through accelerated generation times.

Main Methods:

  • Implementation of speed breeding (SB) protocols adapted for winter wheat.
  • Integration of a high-throughput vernalization phase into the SB system.
  • Testing varying sowing depths (shallow vs. deep) to assess their effect on maturity.

Main Results:

  • Speed breeding significantly reduced the time to flowering in winter wheat.
  • High-throughput vernalization added an average of ten days to the harvest time compared to normal vernalization.
  • Shallow planting depth accelerated crop maturity by approximately five days.

Conclusions:

  • A combined approach of SB, shallow planting, and high-throughput vernalization shortens the winter wheat breeding cycle by 22 days per generation (44 days/year).
  • This optimized protocol effectively addresses the vernalization requirements of genotypes with high needs.
  • The developed system is compatible with high-throughput phenotyping and breeding applications.