Abstract
The mineral content of plant seeds depends on both environmental and genetic factors. The aim of this study was to detect quantitative trait loci (QTLs), and their candidate genes, for the accumulation of phosphorus (P), calcium (Ca), magnesium (Mg), zinc (Zn), copper (Cu), iron (Fe), and manganese (Mn) in seeds of Brassica napus under normal and low P conditions using an F 10 recombinant inbred line (RIL) population. Two-year field trials were conducted to investigate seed mineral accumulation. The results showed a significant decrease in most of the minerals in the BE RIL population, as well as in two parental lines, when grown in a low P environment compared to a normal P environment. In total, 60 putative QTLs were identified, 33 of which overlapped with each other in nine genomic regions in seven linkage groups. Twenty-one of the 60 significant QTLs co-located with eight seed weight QTLs, and only five overlapped with three seed yield QTLs. Moreover, only six QTLs for the same minerals were identified both in normal and low P levels. By comparative mapping of Arabidopsis and B. napus, 148 orthologs of 97 genes involved in the homeostasis of the seven minerals in Arabidopsis were associated with 47 QTLs corresponding to 24 chromosomal regions. These results offer insight into the genetic basis of mineral accumulation across different P conditions in seeds of B. napus and allow the potential utilization of QTLs in biofortification.



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Acknowledgments
This work was supported by the National Basic Research and Development Program [2011CB100301], the National Natural Science Foundation [31201672], China and the Specialized Research Found for the Doctoral Program of Higher Education, Ministry of Education of China [4010-121045]. This work was also partly supported by the open funds of the National Key Laboratory of Crop Genetic Improvement, Wuhan, China.
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Ding, G., Shi, L., Zhao, H. et al. Genetic analysis of seed mineral accumulation affected by phosphorus deprivation in Brassica napus . Euphytica 193, 251–264 (2013). https://doi.org/10.1007/s10681-013-0933-z
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DOI: https://doi.org/10.1007/s10681-013-0933-z


