Journal
PLANT CELL REPORTS
Volume 40, Issue 5, Pages 871-880Publisher
SPRINGER
DOI: 10.1007/s00299-021-02685-6
Keywords
Gene expression; Grain mineral concentrations; Selenium-rich rice; Sodium selenite
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Funding
- Foundation for Research Assistance of Minas Gerais State, Brazil (FAPEMIG) [APQ-01184-17]
- National Council for Scientific and Technological Development, Brazil (CNPq) [302639/2019-5]
- Brazilian Federal Agency for Support and Evaluation of Graduate, Brazil (CAPES) [001]
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Selenium and nitrogen interact to affect rice grain composition, with the combination increasing concentrations of certain nutrients while decreasing others, mainly due to changes in the plant's nitrogen status.
Key message The effects of selenium in rice grain composition depend on the soil nitrogen supply. Selenium and nitrogen have the potential to modify rice grain composition; however, it is unclear how the combined effect of Se and nitrogen affects the grain nutritional quality of rice. In our study, grain Se concentration was positively associated with the increased availability of nitrogen in soil. The accumulation of Se in grain of rice plants treated with Se combined with nitrogen was accompanied by an increase in expression of NRT1.1B, a rice nitrate transporter and sensor, in root. Moreover, Se potentiates the response of nitrogen supply in expression of sulfate transporter OsSULTR1.2, phosphate transporter OsPT2 and silicon transporter OsNIP2.1 in root, thereby increasing root Se uptake capacity. The combination of Se with high nitrogen increased the concentrations of protein, carbohydrates, Se, Mo and Mg, but decreased concentrations of Fe, Mn, Cu and Zn in grain. Overall, our results revealed that many of the effects of Se in rice grain composition are due to a shift in the nitrogen status of the plant.
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