Genealogy-dependent variation in viability among self-incompatibility genotypes.

Published

Journal Article

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.

Full Text

Duke Authors

Cited Authors

  • Uyenoyama, MK

Published Date

  • June 2003

Published In

Volume / Issue

  • 63 / 4

Start / End Page

  • 281 - 293

PubMed ID

  • 12742174

Pubmed Central ID

  • 12742174

Electronic International Standard Serial Number (EISSN)

  • 1096-0325

International Standard Serial Number (ISSN)

  • 0040-5809

Digital Object Identifier (DOI)

  • 10.1016/s0040-5809(03)00020-0

Language

  • eng