Cytoplasmic male-sterility: identification
of the number of the restorer genes
--Tai-chen Qin, Miang-liang Xu and
De-xiang Dun
The number of restorer genes in two male-sterile
cytoplasms, C-group and Y-type, were identified on the basis of differing
restoration responses in F1 hybrids, as well as self and backcross progenies
of 14 tester lines in C Huangze 4 and Y Mo17. The results indicated that
three restorer gene loci are involved in the restoration of C-group and
Y-type. Among them two gene loci, Rf4 and Rf5, which showed
full restoring capacity, are required both in C-group and Y-type for fertility
restoration, and act in a duplicate dominant fashion. The third one, however,
is not the same between C-group and Y-type (Rf6 in C-group and Rf7
in Y-type). Either Rf6 or Rf7 can partially restore pollen
fertility and this is further modified by environment. Finally, the Rf7
gene probably inhibits the expression of fertility restoration of the Rf5
gene.
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