Identification of a novel dwarf maize mutant Hii-015 and analyses on the combining ability of its main traits
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Abstract:
There are close relationships among plant height, lodging resistance and planting density of maize, as 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 the 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 the 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 a excellent line in dwarf maize breeding.