Abstract
Semi-dwarfism is an agronomically important trait in breeding for stable high yields and for resistance to damage by wind and rain (lodging resistance). Many QTLs and genes causing dwarf phenotype have been found in maize. However, because of the yield loss associated with these QTLs and genes, they have been difficult to use in breeding for dwarf stature in maize. Therefore, it is important to find the new dwarfing genes or materials without undesirable characters. The objectives of this study were: (1) to figure out the inheritance of semi-dwarfism in mutants; (2) mapping dwarfing gene or QTL. Maize inbred lines ‘18599’ and ‘DM173’, which is the dwarf mutant derived from the maize inbred line ‘173’ through 60Co-γ ray irradiation. F2 and BC1F1 population were used for genetic analysis. Whole genome resequencing-based technology (QTL-seq) were performed to map dwarfing gene and figured out the SNP markers in predicted region using dwarf bulk and tall bulk from F2 population. Based on the polymorphic SNP markers from QTL-seq, we were fine-mapping the dwarfing gene using F2 population. In F2 population, 398 were dwarf plants and 135 were tall plants. Results of χ2 tests indicated that the ratio of dwarf plants to tall plants was fitted to 3:1 ratio. Furthermore, the χ2 tests of BC1F1 population showed that the ratio was fitted to 1:1 ratio. Based on QTL-seq, the dwarfing gene was located at the region from 111.07 to 124.56 Mb of chromosome 9, and we named it rht-DM. Using traditional QTL mapping with SNP markers, the rht-DM was narrowed down to 400 kb region between SNP-21 and SNP-24. The two SNPs were located at 0.43 and 0.11 cM. Segregation analysis of F2 and BC1F1 indicated that the dwarfing gene was likely a dominant gene. This dwarfing gene was located in the region between 115.02 and 115.42 Mb on chromosome 9.
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Acknowledgements
This work was financially supported by funding from National Key Technology Research and Development Program of China (2016YFD0102104), the Project of Innovation Ability Improvement, Sichuan province, China (2017QNJJ-002, 2016ZYPZ-003), National Key Technology Support Program of China (2014BAD01B01-4), and Applied Basic Research Programs of Science and Technology Department, Sichuan Province, China (2016JY0071).
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QC and GRY designed the experiments; QC, JS and WPD performed the experiments and analyzed the data; QC and LYX wrote the manuscript; JZ, YJ and XLX revised the manuscript.
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Chen, Q., Song, J., Du, WP. et al. Identification and genetic mapping for rht-DM, a dominant dwarfing gene in mutant semi-dwarf maize using QTL-seq approach. Genes Genom 40, 1091–1099 (2018). https://doi.org/10.1007/s13258-018-0716-y
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DOI: https://doi.org/10.1007/s13258-018-0716-y