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Journal of Heredity Advance Access originally published online on April 13, 2005
Journal of Heredity 2005 96(4):430-433; 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.

Brief Communication

Single-Locus Gametophytic Incompatibility in Autotetraploids

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

From Institute of Mathematics, Statistics and Actuarial Science, University of Kent, Canterbury, CT2 7NF, UK (Ridout); and East Malling Research, New Road, East Malling, Kent ME19 6BJ, UK (Xu and Tobutt)

Address correspondence to Xiangming Xu at the address above, or e-mail: xiangming.xu{at}emr.ac.uk.

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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