Banca de DEFESA: EDER SILVA DE OLIVEIRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : EDER SILVA DE OLIVEIRA
DATE: 28/06/2021
TIME: 13:45
LOCAL: meet.google.com/qqj-oxkq-iag
TITLE:

"BIOFORTIFICATION AND TOXIDITY BY SELENIUM AND PHYTOEXTRACTION OF CADMIUM IN JAMBU CULTIVATED IN HYDROPONIA"

KEY WORDS:

Hormesis, cadmium, selenium, translocation index, tolerance index

PAGES: 100
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Fertilidade do Solo e Adubação
SUMMARY:

Jambu is a plant native to tropical regions, mainly from the Brazilian Amazon, and widely used in regional cuisine. The aim of this thesis research was to analyze the behavior of jambu [Acmella oleracea (L.) R. K. Jansen] regarding its phytoextraction, toxicity and biofortification capacity. The experiments were individualized for toxicity, phytoextraction and biofortification, with a completely randomized design and carried out in a greenhouse using a semi-hydroponic system. The first experiment analyzed the physiological, biochemical and nutritional behavior of the plant and had 4 treatments and 15 repetitions, totaling 60 plants. Three doses of selenium were used in the form of sodium selenate (5, 10 and 20 mg.L^-1). The second experiment evaluated the biofortification potential and had 6 treatments and 5 repetitions, using doses of selenium, also in the form of selenate, with doses of 1, 2, 3, 4 and 5 mg.L^-1. The third experiment evaluated the phytoextraction capacity of jambu in relation to cadmium at doses 1, 3, 6 and 9 mg.L^-1, with 5 plants per treatment. Data were submitted to ANOVA and principal component analysis for the construction of indicators and composition of the regression model. The growth, mass and physiological indicators, in the evaluation of selenium toxicity, showed a beneficial effect for the plant up to 5 mg.L^-1, with 3.1 mg.L^-1 being the optimal dose of the element for the best performance of the plant. jambu. From 10 mg.L^-1 of Se, that of the plant starts to show signs of toxicity up to a lethal dose of 20 mg.L^-1. The biofortification tests showed that the jambu obtained its best agronomic performance at the dose of 3 mg.L^-1, being able to develop well up to the dose of 5mg.L^-1. The multivariate indicators for this analysis revealed as the ideal range of Se in the nutrient solution the range of concentrations between 2.77 and 3.36 mg.L^-1. However, for human nutrition purposes, the ideal dose of Se in nutrient solution was 1 mg.L-1 due to its ability to translocate and accumulate Se in the aerial part. As for the phytoextractor capacity of jambu for the element Cd, it was evidenced that for doses 1 and 3 mg.L^-1 considered small doses, the plant presented mass gain and greater photosynthetic performance, but with doses above 10 mg.L^-1 this effect is reversed. The plant presented contents of 1.35 mg.kg^-1 and 3.09 mg.kg^-1 when submitted to doses of 1mg.L^-1 and 9 mg.L^-1 respectively, well above the one allowed by Anvisa for leafy vegetables. The research allowed us to conclude that jambu has the capacity of phytoextraction of Cd and can be biofortified at increasing doses of selenium as long as the daily Se consumption limits and plant toxicity levels are respected.

BANKING MEMBERS:
Interno - 388504 - ANTONIO CORDEIRO DE SANTANA
Externa à Instituição - BRUNA SAYURI FUJIYAMA - NENHUMA
Interno - 1065086 - GLEDSON LUIZ SALGADO DE CASTRO
Presidente - 1228204 - MARIO LOPES DA SILVA JUNIOR
Externo à Instituição - WANDERLI ROGÉRIO MOREIRA LEITE - UFPE