【摘要】 从测定67个自交系对 C 型雄花不育性的反应表明:玉米 C 型细胞质雄花不育及其恢复性是一种稳定的遗传特性,一般环境条件的差异,不足以改变其雄花育性表现。C 型雄花不育的恢复性受两对独立的显性重复基因（Rf₃、Rf₄）所支配。因此,不育系及其保持系只有 rf₃rf₃rf₄rf₄这一种基因型,而恢复系则有三种基因型,即 Rf₃Rf₃Rf₄Rf₄、Rf₃Rf₃rf₄rf₄、rf₃rf₃Rf₄Rf₄,并推断恢复系中由单基因决定恢复性者居多。同一恢复系内,单株之间可能出现基因型的差别。广泛布点试验结果说明,由 C 型不育系配制的杂交种与普通胞质的同组合杂交种,均具有相同的适应性、抗病性和产量。C 型雄花不育系配制的豫农704,已开始在生产上应用。更多还原

【Abstract】 67 inbred lines of maize had been tested for their restoringreaction to the C—type cytoplasmic male—sterility.They were clas-sified into four groups according to the degree of pollen restoringability.Both the male—sterility and pollen restoration manifested inthe tested lines were found to be fairly stable under different envi-ronmental conditions and in the last two years.Pollen restoration to the C—type male—sterility was found tobe controlled by two duplicate genes,temporarily designated as Rf₃and Rf₄.The sterility maintaining genotype was therefore assignedto be rf₃ rf₃ rf₄ rf₄,while the restoring inbreds could have oneof the following genotypes:Rf₃ Rf₃ Rf₄ Rf₄,Rf₃ Rf₃ rf₄ rf₄ andrf₃rf₃ Rf₄ Rf₄:These assumptions were verified in various segregatingprogenies with altogether five restoring lines tested for such purpose.Two of the single cross hybrids in the C—type male—sterilecytoplasm were compared with their normal versions in several loca-lities for their adaptability,yield performance and disease resistance,and found to differ insignificantly in all the tested trials so far.The cytoplasmic male—sterility has been now incorporated in thesingle cross hybrid Yu Non 704 for commercial production in HonanProvince.更多还原