Allelic diversity and gene genealogy at the self-incompatibility locus in the Solanaceae

• Published in: Science (American Association for the Advancement of Science) Vol. 273; no. 5279; pp. 1212 - 1216
• Main Authors: Richman, A.D. (University of California at San Diego, La Jolla, CA.), Uyenoyama, M.K, Kohn, J.R
• Format: Journal Article
• Language: English
• Published: Washington, DC American Society for the Advancement of Science 30.08.1996; American Association for the Advancement of Science; The American Association for the Advancement of Science
• Subjects: Alleles; Amino Acid Sequence; Biological and medical sciences; Biological taxonomies; chemistry; Classical genetics, quantitative genetics, hybrids; classification; DIMENSION; Estimated taxes; estimation; EVOLUCION; EVOLUTION; Evolutionary genetics; FILOGENIA; Flowering plants; Flowers & plants; Fundamental and applied biological sciences. Psychology; GENE; Genealogy; GENES; Genes, Plant; Genetic aspects; Genetic loci; genetic polymorphism; Genetic polymorphisms; Genetic Variation; Genetics; Genetics of eukaryotes. Biological and molecular evolution; Molecular Sequence Data; Numbers; PHYLOGENIE; Phylogeny; PHYSALIS; Plant population genetics; Plant Proteins; Plant Proteins - chemistry; Plant Proteins - genetics; Plants; Plants - classification; Plants - genetics; POLIMORFISMO GENETICO; Polymerase Chain Reaction; POLYMORPHISME GENETIQUE; population; Population estimates; Population number; Population size; Pteridophyta, spermatophyta; Selection, Genetic; Sequence Alignment; Solanaceae; SOLANUM; Solanum carolinense; Species; Species diversity; Taxa; Vegetals; Nucleotide sequence; Homology; Genetic distance; Phylogeny; Biodiversity; Molecular evolution; Allele; Selfincompatibility; Complementary DNA; Gene; Dicotyledones; Angiospermae; Spermatophyta; Solanaceae; Speciation; Polymorphism
• ISSN: 0036-8075; 1095-9203
• DOI: 10.1126/science.273.5279.1212

The self-incompatibility (S) locus of flowering plants offers an example of extreme polymorphism maintained by balancing selection. Estimates of recent and long-term effective population size (Ne) were determined for two solanaceous species by examination of S-allele diversity. Estimates of recent Ne in two solanaceous species differed by an order of magnitude, consistent with differences in the species' ecology. In one species, the evidence was consistent with historical population restriction despite a large recent Ne. In the other, no severe bottleneck was indicated over millions of years. Bottlenecks are integral to founder-event speciation, and loci that are subject to balancing selection can be used to evaluate the frequency of this mode of speciation