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Effective population size in field pea.

Josephine Princy Johnson1, Lisa Piche1, Hannah Worral1

  • 1Department of Plant Sciences, North Dakota State University, Fargo, ND, 58108-6050, USA.

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|July 15, 2024
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Summary
This summary is machine-generated.

Effective population size (Ne) estimates in pea reveal lower Ne in modern breeding lines compared to diversity panels. This highlights the need for breeders to monitor genetic diversity to sustain long-term breeding efforts.

Keywords:
Effective population sizeLD scoresLinkage disequilibriumPeaSingle nucleotide polymorphism

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Area of Science:

  • Population genetics
  • Plant breeding
  • Genomic diversity

Background:

  • Effective population size (Ne) is crucial for understanding inbreeding rates and genetic diversity in breeding populations.
  • Smaller Ne leads to faster inbreeding and limits genetic gain, impacting selection effectiveness.
  • Monitoring Ne is increasingly vital in plant breeding for managing genetic variability.

Purpose of the Study:

  • To provide the first estimates of effective population size (Ne) based on linkage disequilibrium (LD) in the pea genome.
  • To compare Ne between modern breeding lines and a diversity panel.

Main Methods:

  • Calculation and comparison of Ne using single nucleotide polymorphism (SNP) markers.
  • Analysis of linkage disequilibrium (LD) extent and patterns.
  • Comparison between North Dakota State University (NDSU) modern breeding lines and the United States Department of Agriculture (USDA) diversity panel.

Main Results:

  • Linkage disequilibrium (LD) extent varied significantly across the pea genome.
  • NDSU lines exhibited higher and longer-range LD (average r2 = 0.57) compared to the USDA panel (average r2 = 0.34).
  • Estimated Ne was nearly three-fold higher for the USDA panel (Ne = 174) than for NDSU lines (Ne = 64), potentially influenced by population structure.

Conclusions:

  • The study offers insights into the genetic diversity of the studied pea germplasm.
  • Results guide plant breeders in actively monitoring Ne across breeding cycles.
  • Sustaining long-term breeding viability requires careful management of effective population size.