Cytoplasmic male sterility (CMS), the transmitted failure to produce functional pollen, is a widespread trait in higher plants. Brassica napus is widely grown as the oilseed crop of rape or canola, its hybrids may be enhanced by as much as 60% above that of parental lines, so it has great value in applying Brassica CMS in the production of hybrid rapeseed. At present, investigations of CMS in Brassica napus have focused on three male sterile cytoplasms: ogu, nap, and pol. Both because the Polima o...