QTL Mapping of Mineral Element Contents in Rice Using Introgression Lines Derived from an Interspecific Cross
Cheryl Adeva | Yeo-Tae Yun | Kyu-Chan Shim | Ngoc Ha Luong | Hyun-Sook Lee | Ju-Won Kang | Hyun-Jung Kim | Sang-Nag Ahn
Developing rice varieties with increased mineral element content is the most cost-effective and efficient approach for alleviating human malnutrition and nutrient deficiencies. In this study, quantitative trait loci (QTLs) were mapped for mineral element content in 96 introgression lines derived from a cross between the elite Korean <i>Oryza sativa japonica</i> cultivar “Hwaseong” and the wild rice <i>Oryza rufipogon</i> (IRGC105491). The population was grown in two locations, and Fe, Zn, Mn, and Ca contents of the brown rice were measured. Six QTLs were identified on chromosomes 6, 8, and 10, and all <i>O. rufipogon</i> alleles increased trait values. The positions of <i>qFe10</i> and <i>qZn10</i> were further defined; higher Fe and Zn contents are related to the 375-kb <i>O. rufipogon</i> segment between the markers RM1873 and RM25612. The combined analysis of the whole-genome sequencing data, spatiotemporal expression profile, and gene expression suggested that a transcription factor gene, namely the rice homeobox gene 9 (LOC_Os10g33960) marks as the high potential candidate associated with Fe and/or Zn regulation. This study provides valuable information on candidate genes <i>qFe10</i> and <i>qZn10</i> from <i>O. rufipogon</i>, which may be vital in developing rice varieties with increased Fe and/or Zn content without any penalty in traits of agronomic importance.
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