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Journal of Heredity Advance Access first published online on April 13, 2005
This version published online on July 1, 2005
Journal of Heredity, doi:10.1093/jhered/esi063
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© The American Genetic Association. 2005. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org.
Received July 13, 2004
Accepted February 7, 2005

Brief Communication

Single-Locus Gametophytic Incompatibility in Autotetraploids

M. S. Ridout 1, X.-M. Xu 2*, and K. R. Tobutt 2

1 From Institute of Mathematics, Statistics and Actuarial Science, University of Kent, Canterbury, CT2 7NF, UK
2 East Malling Research, New Road, East Malling, Kent ME19 6BJ, UK

* To whom correspondence should be addressed.
X.-M. Xu, E-mail: xiangming.xu{at}emr.ac.uk


  Abstract

It is known that a single-locus gametophytic self-incompatibility (GSI) system can persist with just two distinct alleles in an autotetraploid population, in contrast to diploid GSI systems, assuming "competitive interaction" in which heteroallelic pollen is universally compatible. The steady-state population structure of a GSI system in autotetraploids was investigated in an undivided population assuming "competitive interaction." A deterministic model was developed to predict the frequencies of genotypes with two, three, or four distinct S alleles, assuming no mutation or population subdivision. The model showed that unlike in diploid GSI systems, the limiting values of the frequencies of genotype classes do not minimize pollen wastage.

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