Selenium application forms in upland rice plants aiming agronomic biofortification and improvement of grain nutritional quality

• Grant number: 16/19937-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: December 01, 2016
• End date: November 30, 2018
• Field of knowledge: Agronomical Sciences - Agronomy - Soil Science
• Principal Investigator: André Rodrigues dos Reis
• Grantee: Eduardo Henrique Marcandalli Boleta
• Host Institution: Faculdade de Ciências e Engenharia. Universidade Estadual Paulista (UNESP). Campus de Tupã. Tupã , SP, Brazil

Abstract

There are conclusive evidences of selenium (Se) deficiency in Brazilian soils, which can lead Se deficiency in plants, animals and humans. Thus, is needed to increase the Se concentration on edible parts of modern cultivars, because the highest yield has shown a low micronutrient content and poor nutritional food quality. Selenium at low concentrations is essential for humans and animals, however, selenium at high concentrations and/or the inappropriate fertilizer management can cause environmental pollution problems. Therefore, this study aims to assess the best way of selenium application form (via soil and foliar) in upland rice plants in order that selenium concentration in grains does not exceed 0.3 mg/kg as allowed by the Codex Alimentarius. To achieve our purpose, the efficiency of agronomic biofortification will be evaluated using a variety BRS Esmeralda because is widely planted in cerrado areas of Brazil. Based on our former studies, the levels of selenium to be applied via soil are: (0; 2,5; 5; 7,5; 10; 15; e 20 g ha-1) and via foliar are: (0; 1; 2; 4; 6; 8 e 10 g ha-1), using sodium selenate as a source, 14 treatments with 4 replications, totaling 56 experimental plots. The antioxidant role of Se in plants will be analyzed by the determination of antioxidant enzymes (superoxi dismutase, catalase, gluthatione reductase) and the formation of reactive oxygen species (hydrogen peroxide and lipid peroxidation) in plant tissue. At the end, we will evaluate the effect of levels and application forms of selenium on the yield, 100 grain weight, mineral nutrient concentration in grains and leaves, total amino acid content, protein, sugars and phytate in upland rice. The mechanisms involved in Se accumulation and its traits related to crop response to Se fertilizer can provide a poweful information for further plant breeding and fertilizer management to improve food nutritional quality. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DOS REIS, ANDRE RODRIGUES; MARCANDALLI BOLETA, EDUARDO HENRIQUE; ALVES, CHARLINE ZARATIN; COTRIM, MAYARA FAVERO; BARBOSA, JULIERME ZIMMER; SILVA, VINICIUS MARTINS; PORTO, RAFAEL LAWANDOVSKI; DANTAS BERETA LANZA, MARIA GABRIELA; LAVRES, JOSE; FERESIN GOMES, MARCOS HENRIQUE; et al. Selenium toxicity in upland field-grown rice: Seed physiology responses and nutrient distribution using the mu-XRF technique. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, v. 190, MAR 1 2020. (15/05942-0, 16/19937-0, 15/19121-8)