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Author Uyenoyama, Marcy K.
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Self-incompatibility Genotype ♦ Genealogy-dependent Variation ♦ High Polymorphism ♦ Immediate Parent Specificity ♦ S-allele Genealogy ♦ Many Hermaphroditic Plant Avoid Self-fertilization ♦ Diffusion Approximation Model ♦ Recessive Deleterious Factor ♦ Unusual Feature ♦ New Specificity ♦ S-locus Genotype ♦ Stochastic Steady State ♦ Genealogy-based Antagonism ♦ Pollen Specificity ♦ Empirical Study ♦ S-allele Lineage ♦ Viability Tends ♦ Antagonistic Interaction ♦ Empirical Finding ♦ Related S-alleles
Abstract Many hermaphroditic plants avoid self-fertilization by rejecting pollen that express genetically determined specificities in common with the pistil. The S-locus, comprising the determinants of pistil and pollen specificity, typically shows extremely high polymorphism, with dozens to hundreds of specificities maintained within species. This article explores a conjecture, motivated by empirical findings, that the expression of recessive deleterious factors at sites closely linked to the S-locus may cause greater declines in the viability of zygotes constituted from more closely related S-alleles. Diffusion approximation models incorporating variation in viability among S-locus genotypes and antagonistic interactions between a new specificity and its immediate parent specificity are constructed and analyzed. Results indicate that variation in viability tends to reduce the number of specificities maintained in a population at stochastic steady state, and that genealogy-based antagonism reduces the rate of bifurcation of S-allele lineages. These effects may account for some of the unusual features observed in empirical studies of S-allele genealogies.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Article