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Originally published as Genetics Published Articles Ahead of Print on September 30, 2004.

Genetics, Vol. 169, 355-373, January 2005, Copyright © 2005
doi:10.1534/genetics.104.029546

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Genetics of Hybrid Incompatibility Between Lycopersicon esculentum and L. hirsutum

Leonie C. Moyle*,1 and Elaine B. Graham{dagger}

* Center for Population Biology, University of California, Davis, California 95616
{dagger} Tomato Genetics Resource Center, University of California, Davis, California 95616

1 Corresponding author: Center for Population Biology, 2320 Storer Hall, University of California, 1 Shields Ave., Davis, CA 95616.
E-mail: lcmoyle{at}ucdavis.edu

We examined the genetics of hybrid incompatibility between two closely related diploid hermaphroditic plant species. Using a set of near-isogenic lines (NILs) representing 85% of the genome of the wild species Lycopersicon hirsutum (Solanum habrochaites) in the genetic background of the cultivated tomato L. esculentum (S. lycopersicum), we found that hybrid pollen and seed infertility are each based on 5–11 QTL that individually reduce hybrid fitness by 36–90%. Seed infertility QTL act additively or recessively, consistent with findings in other systems where incompatibility loci have largely been recessive. Genetic lengths of introgressed chromosomal segments explain little of the variation for hybrid incompatibility among NILs, arguing against an infinitesimal model of hybrid incompatibility and reinforcing our inference of a limited number of discrete incompatibility factors between these species. In addition, male (pollen) and other (seed) incompatibility factors are roughly comparable in number. The latter two findings contrast strongly with data from Drosophila where hybrid incompatibility can be highly polygenic and complex, and male sterility evolves substantially faster than female sterility or hybrid inviability. The observed differences between Lycopersicon and Drosophila might be due to differences in sex determination system, reproductive and mating biology, and/or the prevalence of sexual interactions such as sexual selection.




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