The inheritance of fertility restoration in male-sterile wheat carrying cytoplasm derived from Triticum timopheevi.

The inheritance of the restoration of fertility in material carrying the cytoplasm of Triticum timopheevi was studied in F2, F3 and F4 generations. In the material used the segregation of restoration was shown to fit the hypothesis of three major, dominant, partially dominant or additive genes each of which made a different contribution to restoration but which acted cumulatively to produce the phenotypic expression observed.From the material it was possible to extract homozygous lines carrying known combinations of these three genes which can be used as tester lines to investigate the inheritance of genes for restoration derived from other sources.