摘要
14 isoplasmic and allonuclear cytoplasmic male sterile lines were used as female parents, 8 tester lines as male parents, 101 F, progenies were obtained. Fertility restoration response of 101 F] progenies were investigated through field observation and pollen stainability examination under microscope. 14 isoplasmic and allonuclear cytoplasmic male sterile lines were developed by repeated backcross with recurrent male parent lines for more than 8 generations. The result shows: tester line Zifengl not only restored the isoplasmic and allonuclear sterile lines of group C backcrossed with Mo17, Yu30 and Heer, but also completely restored the isoplasmic and allonuclear cytoplasm male sterile lines of group T backcrossed with Mo17, HZS , 1792 , 292 and Yu30. Therefore, nuclear background limits the use of Zifengl as a tester for identification of cytoplasmic male sterility. Furthermore RFLPs of mitochondrial DNA of 6 isonuclear and alloplasmic cytoplasmic male sterile lines were analyzed with BamH I and Hind 1 restriction endonuclease and mitochondrial DNA probes pBcmH3 and Cox II . The same RFLPs were found within sterile cytoplasm of group C, including C, Chuan G, Lei 2 and Lei 3, but a different RFLP pattern was observed among sterile cytoplasm of group S, C, T and the normal cytoplasm. This result suggested that the RFLP markers tightly linked to sterile mitochon-drial genes of different groups could be applied in the identifcation of cytoplasmic male sterility.
14 isoplasmic and allonuclear cytoplasmic male sterile lines were used as female parents, 8 tester lines as male parents, 101 F, progenies were obtained. Fertility restoration response of 101 F] progenies were investigated through field observation and pollen stainability examination under microscope. 14 isoplasmic and allonuclear cytoplasmic male sterile lines were developed by repeated backcross with recurrent male parent lines for more than 8 generations. The result shows: tester line Zifengl not only restored the isoplasmic and allonuclear sterile lines of group C backcrossed with Mo17, Yu30 and Heer, but also completely restored the isoplasmic and allonuclear cytoplasm male sterile lines of group T backcrossed with Mo17, HZS , 1792 , 292 and Yu30. Therefore, nuclear background limits the use of Zifengl as a tester for identification of cytoplasmic male sterility. Furthermore RFLPs of mitochondrial DNA of 6 isonuclear and alloplasmic cytoplasmic male sterile lines were analyzed with BamH I and Hind 1 restriction endonuclease and mitochondrial DNA probes pBcmH3 and Cox II . The same RFLPs were found within sterile cytoplasm of group C, including C, Chuan G, Lei 2 and Lei 3, but a different RFLP pattern was observed among sterile cytoplasm of group S, C, T and the normal cytoplasm. This result suggested that the RFLP markers tightly linked to sterile mitochon-drial genes of different groups could be applied in the identifcation of cytoplasmic male sterility.
