Abstract
Mineral elements play an extremely important role in human health, and are worthy of study in rice grain. Wild rice is an important gene pool for rice improvement including grain yield, disease, and pest resistance as well as mineral elements. In this study, we identified 33 quantitative trait loci (QTL) for Fe, Zn, Se, Cd, Hg, and As contents in wild rice Oryza longistaminata. Of which, 29 QTLs were the first report, and 12 QTLs were overlapped to form five clusters as qSe1/qCd1 on chromosome 1, qCd4.2/qHg4 on chromosome 4, qFe5.2/qZn5.2 on chromosome 5, qFe9/qHg9.2/qAs9.2 on chromosome 9, and qCd10/qHg10 on chromosome 10. Importantly, qSe1/qCd1, can significantly improve the Se content while reduce the Cd content, and qFe5.2/qZn5.2 can significantly improve both the Fe and Zn contents, they were delimited to an interval about 53.8 Kb and 26.2 Kb, respectively. These QTLs detected from Oryza longistaminata not only establish the basis for subsequent gene cloning to decipher the genetic mechanism of mineral element accumulation, but also provide new genetic resource for rice quality improvement.
Highlights
As one of the most important staple crops, rice provides more than 40% of the daily calories for the world’s population and is an important source for protein, vitamins and minerals (Khush, 2001; Parengam et al, 2010)
The content of Fe, Zn, and As in backcrossinbred lines (BILs) group in 2015 was higher than that in 2014, while the content of Hg was lower than that in 2014. The contents of these mineral elements varied in different years, the overall trend remained consistent, which mean that this BIL population can be well used for the further quantitative trait loci (QTL) analysis
Some QTLs related to mineral element accumulation identified from cultivated rice and common wild rice have been successfully applied in production (Garcia-Oliveira et al, 2009; Nawaz et al, 2015)
Summary
As one of the most important staple crops, rice provides more than 40% of the daily calories for the world’s population and is an important source for protein, vitamins and minerals (Khush, 2001; Parengam et al, 2010). Mineral elements play an extremely important role on human health. Micronutrient deficiencies can cause a range of problems, such as Fe deficiency leading to anaemia, Zn deficiency leading to stunted growth and intellectual disability, and selenium (Se) deficiency increasing the risk of cancer (Clark et al, 1996; Umeta et al, 2000; Finley et al, 2001). Increasing the content of mineral elements in rice has important nutritional value for people, especially for those who live rice as the staple food.
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