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doi:10.1534/genetics.104.029546
A more recent version of this article appeared on January 1, 2005.
REGULAR RESEARCH PAPERS |
Genetics of hybrid incompatibility between Lycopersicon esculentum and L. hirsutum
Leonie C Moyle 1* and Elaine B Graham 2
1 University of California
2 University of California, Davis
* To whom correspondence should be addressed. E-mail: lcmoyle{at}ucdavis.edu.
Submitted on March 31, 2004
Revised on June 29, 2004
Accepted on 25 September 2004
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 which 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.
Key Words: Lycopersicon, hybrid incompatibility, plant, reproductive isolation, speciation
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