Abstract
Rice is a major dietary source of essential mineral nutrients and toxic elements (aka ionome) for humans. However, the genetic basis underlying the variation in ionome is still largely unknown. Here, we mapped 51 and 61 quantitative trait loci (QTLs) controlling the concentrations of 13 and 15 elements in rice (Oryza sativa L.) grain and straw, respectively, using a recombinant inbred lines (RILs) that were grown at three different field sites in 3 years. Several QTLs were repeatedly detected in both grain and straw or in multiple years; the resulting 87 unique QTLs with 17 of them (20%) were co-localized with previously reported corresponding QTLs and 70 were novel ionomic QTLs. At least, 14 genomic clusters that controlled the concentrations of multiple elements were identified. Furthermore, we identified a molybdate transporter gene OsMOT1;1 as the putative causal gene for a QTL controlling molybdenum concentration in both straw and grain. QTL analyses based on the concentrations of multiple elements in both grain and straw of RIL population grown in three field sites in 3 years allow us to identify tissue common QTLs and reproducible QTLs that were validated in multiple years. The identification of ionomic QTLs will be useful in revealing the molecular mechanisms underlying the accumulation of elements in rice and providing the opportunity to reduce the accumulation of toxic elements and enrich the accumulation of beneficial elements in rice grain.
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Abbreviations
- As:
-
Arsenic
- B:
-
Boron
- Ca:
-
Calcium
- CIM:
-
Composite interval mapping
- Cd:
-
Cadmium
- cM:
-
Centimorgan
- Co:
-
Cobalt
- Chr:
-
Chromosome
- Cu:
-
Copper
- HD:
-
Heading date
- ICP-MS:
-
Inductively coupled plasma mass spectrometry
- K:
-
Potassium
- LOD:
-
Logarithm of the odds
- Mg:
-
Magnesium
- Mn:
-
Manganese
- Mo:
-
Molybdenum
- Na:
-
Sodium
- Ni:
-
Nickel
- P:
-
Phosphorus
- Pb:
-
Lead
- QTL:
-
Quantitative trait locus
- RIL:
-
Recombinant inbred line
- Zn:
-
Zinc
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Funding
The work was supported by the National Key Research and Development Program of China (Grant No. 2018YFD0800206), the National Natural Science Foundation of China (Grant No. 31772382, 31520103914), the Innovative Research Team Development Plan of the Ministry of Education of China (Grant No. IRT_17R56), the Fundamental Research Funds for the Central Universities (Grant No. KYT201802) and the Natural Science Foundation of Jiangsu Province for Distinguished Young Scholars (Grant No. KB20180023).
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F-JZ and X-YH conceived and designed research, CW, Zhong T and Zhu T conducted experiments, J-YZ provided the RIL population, and X-YH, F-JZ and CW wrote the manuscript with contribution from J-YZ. All authors read and approved the manuscript.
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Wang, C., Tang, Z., Zhuang, JY. et al. Genetic mapping of ionomic quantitative trait loci in rice grain and straw reveals OsMOT1;1 as the putative causal gene for a molybdenum QTL qMo8. Mol Genet Genomics 295, 391–407 (2020). https://doi.org/10.1007/s00438-019-01632-1
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DOI: https://doi.org/10.1007/s00438-019-01632-1