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Personal info for Roger Chetelat

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First nameRoger
Last nameChetelat
OrganizationUniversity of California, Davis
AddressC.M. Rick Tomato Genetics Resource Center
Dept. of Plant Sciences (mail stop 3)
One Shields Ave.
Davis, CA 95616
Keywordsunilateral incompatibility self-incompatibility recombination comparative mapping
Research Organismslycopersicon esculentum, lycopersicon hirsutum, lycopersicon pennellii, Lycopersicon pimpinellifolium, tomato, Solanum lycopersicoides, Solanum sitiens, Solanum juglandifolium, Solanum ochranthum, Lycopersicon peruvianum, Lycopersicon cheesmanii f. minor, Solanum Neorickii, Solanum chmielewskii, Lycopersicon esculentum, solanum habrochaites
InterestsMy research program addresses various questions related to the genetics of the cultivated tomato and its wild relatives. The current focus is on understanding the mechanisms of interspecific reproductive barriers. We are particularly interested in understanding unilateral incompatibility, and how it is related to self-incompatibility. Another goal of our research has been to expand the genetic base of tomato through hybridization and introgression with the related nightshade species Solanum lycopersicoides and S. sitiens. We synthesized introgression lines for lycopersicoides, and attempting to the same for sitiens. Through collaboration with other groups, this material is being used to map genes controlling resistance to diseases, such as gray mold (Botrytis cinerea). We also study factors that limit pairing and recombination between homeologous lycopersicum and lycopersicoides/sitiens chromosomes. One approach has been to modify expression of genes in the DNA mismatch repair system, which in other systems play a role in limiting recombination between diverged sequences. We also compare the genome organization of these and two other tomato-allied Solanum species (ochranthum and juglandifolium), to identify regions of synteny (or lack of). Finally, we study the genetic diversity and relationships within and between wild populations.

These research projects are closely linked to the C.M. Rick Tomato Genetics Resource Center (TGRC), a genebank of over 3,600 accessions of wild species, mutants, and other genetic stocks of tomato. The collection is named after the late Dr. Charles Rick, who collected many of the wild species accessions from South America, and whose research program produced a large share of the marker and cytogenetic stocks. Contributions from many other researchers worldwide have enriched the collection. Additional information on the TGRC is available from our website,

Locus editor assignments:  Cul1
TGRC monogenic mutant population