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Improving efficiency of breeding for higher crop yield.

D H Wallace1, J P Baudoin, J Beaver

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Efficient crop breeding requires simultaneous selection for yield components, not just yield alone. This approach enhances biomass accumulation and harvest index for higher crop yields globally.

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Area of Science:

  • Agricultural Science
  • Plant Breeding
  • Genetics

Background:

  • Exclusive selection for crop yield often fails to increase total biomass.
  • Higher yield necessitates simultaneous selection for key physiological components.
  • Genetically controlled interconnections among yield components influence breeding strategies.

Purpose of the Study:

  • To propose simultaneous selection for yield's three major physiological components for efficient crop breeding.
  • To explain the genetic and physiological basis for the lack of indirect selection for biomass from exclusive yield selection.
  • To detail how yield system analysis and statistical models can quantify these components and interactions.

Main Methods:

  • Yield system analysis (YSA) to quantify physiological components and their correlations.
  • Additive main effects and multiplicative interaction (AMMI) analysis to separate genotype × environment (G × E) effects.
  • Utilizing yield trials for simultaneous selection of biomass, yield accumulation, and G × E adaptation.

Main Results:

  • Exclusive yield selection yields limited gains in total biomass.
  • Simultaneous selection for biomass accumulation, harvest index, and optimal maturity time is crucial.
  • Quantification of negative correlations between harvest index and biomass/maturity, and positive correlation between biomass and maturity.

Conclusions:

  • Simultaneous selection for yield's physiological components is essential for effective crop improvement.
  • Yield system analysis and AMMI models provide tools to understand and optimize breeding strategies.
  • This integrated approach accelerates the development of higher-yielding crop varieties adapted to diverse environments, boosting global food production.