Mh. Jia et al., NUCLEAR FERTILITY RESTORER GENES MAP TO THE SAME LINKAGE GROUP IN CYTOPLASMIC MALE-STERILE BEAN, Theoretical and Applied Genetics, 95(1-2), 1997, pp. 205-210
Fertility restoration in cytoplasmic male-sterile plants (CMS) by nucl
ear restorer genes is one of the few useful systems for studying nucle
ar-mitochondrial interactions in higher eukaryotes. In CMS bean there
exist multiple independently identified nuclear genes that restore fer
tility. Two restorer genes (Fr and Fr-2) have been characterized previ
ously. We have genetically characterized two additional restorer genes
; both restorers are single genes that behave similarly to Fr-2. We co
mpared the linkage relationship of all four independently identified r
estorer genes to understand the relationship among these loci further.
All four genes map to the same linkage group. It was not possible to
distinguish between the two newly identified restorer genes and Fr-2.
We suggest that they may be allelic.