Rf1, the dominant nuclear restorer of type T cytoplasmic male sterility, was mapped relative to Lg3, Rg, and d. The results shown below (Table 1) indicate that Rf1 is about 3 cM distal to Lg3. This is probably an underestimate of the actual distance between Lg3 and Rf1 because one class of recombinants in this region was absent from test cross progeny. It is still unclear whether Rf1 is on the short or long arm of chromosome 3 because the location of the centromere relative to Lg3 and Rg is unknown.
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