玉米矮秆突变体Hii-015的鉴定及主要性状配合力分析

以新的玉米矮秆突变体Hii-015、野生型W015和16个玉米自交系为材料,分析矮秆突变体Hii-015的表型特征、遗传方式和主要性状的配合力,探讨玉米矮秆基因的发掘与利用。结果表明,细胞长度缩短导致突变体Hii-015植株矮化,突变体Hii-015除植株矮化外,其经济性状与野生型W015比无明显变化;单隐性基因控制突变体Hii-015的矮秆突变性状,突变体Hii-015是能稳定遗传的矮生型;矮秆突变体Hii-015的株高、穗位高、节间长度和节间数的一般配合力呈现最大的负效应,主要经济性状行粒数、百粒重和单株产量的一般配合力呈现正效应。突变体Hii-015是优良的玉米矮秆育种材料。

Identification of a Novel Dwarf Maize Mutant Hii-015 and Analyses on the Combining Ability of Its Main Traits

There are close relationships among plant height, lodging resistance and planting density of maize, as a dwarf is a goal trait of maize to gain a high yield. In this study, using a dwarf maize mutant Hii-015, its wild type W015 and 16 inbred lines, we analyzed phenotype characteristics, hereditary model and combining ability of main traits to explore the utilization of maize dwarf genes. The results indicated that the dwarf of the mutant Hii-015 resulted from shorten internodes. Excluding the dwarf trait, the economic traits of the mutant Hii-015 exhibited no differences when compared with those of the wild type W015. The dwarf trait of the mutant Hii-015, which is controlled by a single recessive gene, can inherit. For general combining ability of Hii-015, the most negative effects were found in plant height, ear height, internode length and the number of internodes, while positive effects were recorded in kernel numbers per row, 100-kernel weight and yield per plant. It can be concluded that the mutant Hii-015 is an excellent line in dwarf maize breeding.