【摘要】 作者从国外引进的玉米杂交种中获得雄性不育株,育成了不育性稳定的优良雄性不育系及其保持系和恢复系,并利用它们配制成强优势杂交组合,比现有推广种增产显著。在本试验的玉米测交材料中约有60%具有纯合或杂合恢复基因,约40%具有纯合不育基因,因此利用这些材料很容易培育成优良雄性不育系和恢复系。这些不育系育性的表现受胞质与一对育性核基因互作的控制。更多还原

【Abstract】 A few male sterile plants were found in a maize hybrids intro-duced from Italy in the summer of 1973.They were pollinated bythe sister plants.All plants obtained in the next generation and aftersuccessive back—crosses were proved to be male sterile,while the selfedprog(?)nies of the paternal parent remained fertile.This indicated thecytoplasmic nature of the male—sterility.Some stable male sterile lineswith desirable agronomic characters were selected through selection andbackcrossing.Among inbred lines or other breeding materials so fartested,60% of them were found to be homozygous or heterozygous forfertility restoring genes and about 40% of them being homozygous forthe male sterile genes.Using these new male sterile lines and theirrestorers,we have made and found some good hybrid combinations withhigh combining ability,the best of them giving a 30% higher yieldthan the popular open—pollinated variety.The fertility restoration was foundto be controlled dy a dominant gene.No effort has been made toidentify the type of male sterile cytoplasm in this paper.更多还原