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Phenotypic changes during 100-year rice breeding programs in Hokkaido.

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Summary

Local rice breeding programs in Hokkaido show wide phenotypic variations in 26 agro-economical traits. This study proposes a model for artificial selection, linking phenotype changes to genetic diversity for improved crop adaptability.

Keywords:
Oryza sativa L.local populationplant breeding programsriceselection

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Area of Science:

  • Agricultural Science
  • Genetics
  • Plant Breeding

Background:

  • Local plant breeding programs can generate desirable genetic and phenotypic variations, influencing population adaptability.
  • While genetic population structures are characterized, the impact of phenotypic variations on agro-economical traits remains unclear.

Purpose of the Study:

  • To evaluate phenotypic changes in 26 agro-economical traits within Hokkaido's local rice breeding programs.
  • To understand the relationship between phenotypic variation and genetic population structure in local rice populations.

Main Methods:

  • Assessed 26 agro-economical traits across local rice populations in Hokkaido.
  • Compared phenotypic trait values across different genetic population structures.
  • Classified trait changes into four patterns (A, B, C, D) based on the timing of significant differences.

Main Results:

  • Observed wide variations and continuous distributions in all 26 agro-economical traits.
  • Identified distinct patterns of phenotypic change (Patterns A, B, C, D) relative to genetic structures.
  • Pattern A and B showed significant differences once and twice, respectively; Pattern C showed gradual differences; Pattern D showed no desired directional differences.

Conclusions:

  • Phenotypic changes in agro-economical traits are linked to genetic population structure in Hokkaido rice breeding.
  • A model for artificial selection of phenotypes within genetic diversity of local rice populations has been proposed.