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Linkage disequilibrium and gametophytic self-incompatibility.

C R Leach1, O Mayo, M M Morris

  • 1Department of Genetics, Waite Agricultural Research Institute, The University of Adelaide, 5000, Adelaide, South Australia, Australia.

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Summary

This study examines how linked genes approach equilibrium with self-incompatibility (S) loci. Linkage disequilibrium can stabilize before genotype frequencies, and selection

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Area of Science:

  • Population genetics
  • Molecular genetics
  • Evolutionary biology

Background:

  • Gametophytic self-incompatibility (S) systems influence plant reproduction and evolution.
  • Understanding linkage disequilibrium is crucial for predicting genetic changes.
  • Previous models of S-linked locus equilibrium made unrealistic assumptions about pollen behavior.

Purpose of the Study:

  • To analyze the approach to linkage equilibrium for loci linked to the S locus.
  • To investigate the impact of selection on linked loci under gametophytic self-incompatibility.
  • To re-evaluate previous conclusions regarding the sheltering of lethals by S-systems.

Main Methods:

  • Mathematical modeling of linkage disequilibrium dynamics.
  • Analysis of gene and genotype frequencies under various scenarios.
  • Comparison with existing theoretical frameworks and empirical data.

Main Results:

  • Linkage disequilibrium approaches zero via steady decline, oscillation, or a combination.
  • Equilibrium can be reached before genotype frequencies stabilize.
  • Selection against linked genotypes can be less effective than predicted, especially with complete linkage.

Conclusions:

  • The study provides a more comprehensive model for linkage disequilibrium near S loci.
  • Previous analyses based on simplified models are potentially misleading.
  • Self-incompatibility systems are unlikely to shelter lethals without complete linkage.