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Optimized breeding strategies for multiple trait integration: III. Parameters for success in version testing.

Xiaochun Sun1, Rita H Mumm2

  • 1Department of Crop Sciences and the Illinois Plant Breeding Center, University of Illinois at Urbana-Champaign, 1102 S. Goodwin Ave., Urbana, IL 61801 USA ; Dow AgroSciences, Indianapolis, IN USA.

Molecular Breeding : New Strategies in Plant Improvement
|October 23, 2015
PubMed
Summary

Multiple trait integration (MTI) in maize breeding optimizes hybrid conversion by balancing residual non-recurrent parent (NRP) germplasm and parental line versions. Achieving over 95% success requires careful consideration of these factors for yield equivalency.

Keywords:
Breeding strategyComputer simulationEquivalent performanceMarker-assisted backcrossingSuccess rateTrait integrationVersion testing

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Area of Science:

  • Plant Breeding and Genetics
  • Agricultural Biotechnology
  • Maize Genetics

Background:

  • Multiple Trait Integration (MTI) is crucial for enhancing maize hybrids by incorporating value-added traits.
  • The process aims to maintain the original hybrid's performance while adding new genetic traits, typically using backcross breeding.
  • Key steps include single event introgression, event pyramiding, trait fixation, and version testing for performance equivalency.

Purpose of the Study:

  • To explore parameters in version testing for successful maize hybrid conversion.
  • To determine the impact of residual non-recurrent parent (NRP) germplasm and parental line conversion versions on MTI success rates.
  • To achieve high likelihood of recovering at least one converted hybrid version with yield performance within 3% of the original target hybrid.

Main Methods:

  • Computer simulations were used to model the MTI process in maize.
  • Investigated the effects of residual NRP germplasm (120-180 cM) and the number of parental conversion versions (up to 5).
  • Evaluated all hybrid combinations of converted parental lines for yield performance.

Main Results:

  • A success rate exceeding 95% was achieved with 5 versions of each parental conversion and testing 25 hybrid versions when residual NRP germplasm was ≤180 cM.
  • When residual NRP germplasm was ≤120 cM, only 4 versions of one parent were needed, reducing yield testing to 20 hybrid versions.
  • These findings support strategies for optimizing earlier MTI steps and setting thresholds for residual NRP germplasm.

Conclusions:

  • Optimizing the number of parental line versions and controlling residual NRP germplasm are critical for successful MTI in maize.
  • The study provides data-driven insights for designing efficient maize conversion programs.
  • Results validate previous findings on breeding strategies for effective MTI.