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Evaluation of ureide metabolism and nitrogen compounds in cowpea plants in response to selenium application and its relation to grain nutritional quality

Grant number: 18/15490-7
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): December 01, 2018
Effective date (End): December 31, 2019
Field of knowledge:Agronomical Sciences - Agronomy - Crop Science
Principal Investigator:André Rodrigues dos Reis
Grantee:Maria Gabriela Dantas Bereta Lanza
Host Institution: Faculdade de Ciências e Engenharia. Universidade Estadual Paulista (UNESP). Campus de Tupã. Tupã , SP, Brazil
Associated scholarship(s):19/09935-9 - Effect of selenium fertilization on ureide metabolism and nutritional quality of cowpea beans, BE.EP.IC


Selenium (Se) can enhance the nitrogen metabolism of legume plants. Biological nitrogen fixation by cowpea plants is poorly understood. There is conclusive evidence of Se deficiency in Brazilian soil, which can lead to Se deficiency in humans and animals. Thus, further studies are needed in order to improve the Se status in the edible part of plants. Northeast of Brazil is the main malnourished region and the cowpea beans is the main source of protein for local population. This study aims to evaluate the ureide metabolism of cowpea plants in response to Se application aiming to increase the yield and the grain nutritional quality. Our hypothesis is that ureide (allantoin and allantoic acid) and nitrogen compounds (amino acids, nitrate, ammonium) can increase the storage protein (albumin, globulin, prolamin and glutelin) in the seeds. To test our hypothesis, 2 experiments will be performed. Experiment I. Application of Se (0, 10, 25, 50, 100 and 150 g ha-1) applied via foliar and soil. Experiment I was performed founded by FAPESP Grant number (2015/26817-9). In this experiment, ureide metabolism and nitrogen compounds were not analyzed. Experiment II. Based on our previous results (FAPESP 2015/26817-9), a new field experiment will be installed to evaluate the application of 15 g ha-1 of Se on the growth and biological nitrogen fixation of cowpea plants. The Se will be applied via soil after 7 days of seedlings emergence. The cultivar BRS-Xique-Xique will be used because is widely cultivated in Northeast of Brazil. After the application of treatments, plants will be collected weekly to evaluate the dry biomass of shoots, roots, number of nodules, the weight of nodules, and determination of Se and all essential elements. The plants will be cultivated until the final life cycle in order to harvest the grains and evaluate the yield. This study aims to identify the phonological stage of higher Se accumulation in plants to establish the proper application time of Se aiming higher yield and Se accumulation in the grains. (AU)

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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)
LANZA, MARIA GABRIELA DANTAS BERETA; SILVA, VINICIUS MARTINS; MONTANHA, GABRIEL SGARBIERO; LAVRES, JOSE; DE CARVALHO, HUDSON WALLACE PEREIRA; DOS REIS, ANDRE RODRIGUES. Assessment of selenium spatial distribution using mu-XFR in cowpea (Vigna unguiculata (L.) Walp.) plants: Integration of physiological and biochemical responses. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, v. 207, . (15/26817-9, 18/15490-7, 15/19121-8, 15/05942-0)

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