Agronomic biofortification of upland rice with selenium and nitrogen and its relation to grain quality. (January 2018)

• Record Type: Journal Article
• Authors: Reis, Heitor Pontes Gestal; Barcelos, Jéssica Pigatto de Queiroz; Junior, Enes Furlani; Santos, Elcio Ferreira; Silva, Vinícius Martins; Moraes, Milton Ferreira; Putti, Fernando Ferrari; Reis, André Rodrigues dos
• Is Part Of: Journal of cereal science. Volume 79(2018)
• Page Start: 508
• Page End: 515
• Publication Date: 2018-01
• Subjects: Reserve proteins -- Physiological responses -- Human health -- Sodium selenate; Grain -- Periodicals; Cereal products -- Periodicals; Céréales -- Périodiques; Produits céréaliers -- Périodiques; Cereal products; Grain; Periodicals; 664.705
• DOI: 10.1016/j.jcs.2018.01.004
• Languages: English
• ISSNs: 0733-5210

Abstract

Abstract: The objective of the present study was to evaluate agronomic biofortification with nitrogen (N) and selenium (Se) with the aim of increasing the daily Se intake by the population and the nutritional quality of the grain. A randomized block experimental design with a 5 × 2 factorial scheme was used; the factors were the five levels of N (0, 20, 40, 80, and 120 kg ha −1 ), applied as topdressing fertilization, and the two levels of Se (0 and 25 g ha −1 ). The reserve protein fractions in the seeds, glutelin, and globulin increased significantly when Se application was combined with N fertilization. Grain Se content varied from 0.03 to 0.35 mg kg −1, which was within the food safety limit of 0.3 mg kg −1 established by the Codex Alimentarius . The estimated daily Se intake originating from Se-biofortified rice varied between 2.05 and 24.7 μg per day, representing an increase from 3.72% to 44.9% of the daily Se requirement. Because the recommended Se daily intake for adults is 55 μg per day, the present study presents relevant information about agronomic biofortification to increase Se concentrations in edible plant parts, with possible benefits to human health. Highlights: Se and N increase the albumin and glutelin in rice seeds. The combination of Se and N enhances the daily Se intake. 25 g ha −1 of Se achieves the Se levels in seeds as suggested by the Codex Alimentarius. Se combined with N reduces the lipid peroxidation in rice leaves. Agronomic biofortification improves the Se level in rice seeds.