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Determination of Self- and Inter-incompatibility Relationships in Apricot Combining Hand-Pollination, Microscopy and Genetic Analyses
Published on: June 16, 2020
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.
This study examines how linked genes approach equilibrium with self-incompatibility (S) loci. Linkage disequilibrium can stabilize before genotype frequencies, and selection
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.
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