Abstract
Stylar proteins involved in the self-incompatible (SI) response ofLycopersicon hirsutum have been identified and mapped to the locus that controls SI (S locus).L. esculentum, a self-compatible (SC) species of cultivated tomato, does not display these proteins. Hybrids between SCL. esculentum and SIL. hirsutum are self-sterile despite these individuals bearing pollen containing theS allele ofL. esculentum. In progeny derived from backcrossing the hybrids toL. esculentum, there was a strong correlation between the presence of theS allele fromL. hirsutum and self-infertility. However, this relationship was uncoupled in a number of backcross (BC) progeny. The SI response appeared to be nonexistent in two self-fertile BC individuals that were heterozygous for theS allele ofL. hirsutum, based on Mendelian segregation of a tightly linked DNA marker,CD15, in selfed progeny. Among these progeny self-fertile individuals that were homozygous for theL. hirsutum allele of the linked marker were also determined to be homozygous for anS-related protein ofL. hirsutum through test crosses withL. esculentum. Therefore, plants were produced that were homozygous for a functionalS allele but were self-fertile. This result and other evidence suggest that theS-related proteins are not sufficient to elicit a self-incompatible response inL. esculentum and that there is a mutation(s) inL. esculentum somewhere other than theS locus that leads to self-compatibility.
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Bernatzky, R., Glaven, R.H. & Rivers, B.A. S-related protein can be recombined with self-compatibility in interspecific derivatives ofLycopersicon . Biochem Genet 33, 215–225 (1995). https://doi.org/10.1007/BF02401852
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DOI: https://doi.org/10.1007/BF02401852