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Learning from rejection: the evolutionary biology of single-locus incompatibility
1Adam Richman and Joshua Kohn are at the Dept of Biology, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0116, USA.
Trends in Ecology & Evolution
|January 18, 2011
Summary
The S-locus in flowering plants reveals population size and history. Analyzing S-allele diversity helps understand plant population dynamics and the evolution of self-incompatibility systems.
Area of Science:
- Plant reproductive biology
- Population genetics
- Evolutionary biology
Background:
- The self-incompatibility (S-) locus in flowering plants is highly polymorphic.
- Understanding S-locus diversity is crucial for plant breeding and conservation.
Purpose of the Study:
- To utilize S-locus polymorphism for estimating effective population size.
- To investigate the deep evolutionary history of self-incompatibility systems.
- To determine the homology and shared ancestry of S-alleles across angiosperm families.
Main Methods:
- Polymerase Chain Reaction (PCR) techniques to analyze S-locus alleles.
- Estimation of allele number and sequence diversity in natural populations.
- Phylogenetic analysis of S-alleles and related genes.
Main Results:
- S-locus allele number estimates recent effective population size.
- Sequence relationships of S-alleles provide estimates of population size over millions of years.
- Comparative analysis of S-alleles and related genes dates the origin of incompatibility systems.
Conclusions:
- The S-locus is a powerful tool for inferring past and present population sizes in flowering plants.
- This research provides insights into the evolutionary origins and diversification of plant self-incompatibility mechanisms.
- Shared homology of S-alleles can identify angiosperm families with common incompatibility systems.
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