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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 type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): December 01, 2018
Effective date (End): November 30, 2019
Field of knowledge:Agronomical Sciences - Agronomy
Principal Investigator:André Rodrigues dos Reis
Grantee:Maria Gabriela Dantas Bereta Lanza
Home 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

Abstract

Selenium (Se) can enhance the nitrogen metabolism of legume plants. Biological nitrogen fixation by cowpea plants is poorly understood. There are conclusive evidences of Se deficiency in Brazilian soil, which can lead 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 aim to evaluate the ureide metabolism of cowpea plants in response to Se application aiming increase the yield and the grain nutritional quality. Our hypothesis is that ureide (allantoin and allantoic acid) and nitrogen compounds (aminoacids, 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 previously 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 wildely cultivated in Northeast of Brazil. After application of treatments, plants will be collected weekly to evaluate the dry biomass of shoots, roots, number of nodules, 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 aim to identify the phonological stage of higher Se accumulation in plants to establish the properly application time of Se aiming higher yield and Se accumulation in the grains.

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