自交系068对玉米细胞质雄性不育系的恢复性

Restoration of Inbred Line 068 to Cytoplasmic Male Sterile Lines in Maize

以玉米细胞质雄性不育系为材料,对自交系068的育性恢复性进行测定。结果表明,068对478、黄早四、48-2背景下的CMS-T、CMS-C、CMS-S不育胞质分别呈完全恢复、部分恢复和不育性保持。068对同核异质不育系的不同胞质之间未检测到育性恢复上的明显差异。068同不育材料一次测交与再次回交的育性测定结果存在差异。自交系068对可作为CMS-T、CMS-C和CMS-S不育胞质的共同恢复系,为利用多胞质进行不育化制种提供了条件。

Taking isonuclear alloplasmic and isoplasmic allonuclear lines as examples,this experiment was to identify the fertility restoration of maize inbred line 068.Inbred line 068 was used as tested line to the male sterile materials,and the fertility of tested cross F1 and back cross BC1 was investigated.The results showed that 068 can restore the fertility completely to isonuclear alloplasmic male sterile lines with 478 nuclear background,partly restore the fertility to isonuclear alloplasmic male sterile lines with huangzaosi nuclear background and maintain the sterility for isonuclear alloplasmic male sterile lines with 48-2 nuclear background.Fertility restoration differences within each set of isonuclear alloplasmic male sterile lines were not detected,while fertility restoration differences existed between test hybrid F1 and backcross BC1.All these indicated that the component of nuclear background can influence the fertility.Inbred 068 may be used as co-restoration line for CMS-T,CMS-C and CMS-S with 478 background.The results laid a foundation for the utilization of multiple male sterile cytoplasms in the seed propagation and heterosis application of maize.