Banca de DEFESA: GINA ALEXANDRA GARCIA PORRAS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE: GINA ALEXANDRA GARCIA PORRAS
DATA: 29/12/2025
HORA: 09:00
LOCAL: Google Meet
TÍTULO:

Foliar zinc supplementation as a mitigation strategy for cadmium present in phosphate fertilizers in cacao

PALAVRAS-CHAVES:

Trace Element, micronutrient, abiotic stress, phytotoxicity

PÁGINAS: 66
GRANDE ÁREA: Ciências Biológicas
ÁREA: Botânica
SUBÁREA: Fisiologia Vegetal
ESPECIALIDADE: Nutrição e Crescimento Vegetal
RESUMO:

In cacao-producing areas in Brazil, soils are acidic, of low fertility, and highly weathered. As a result, cadmium (Cd) can enter agroecosystems through the application of phosphate fertilizers, becoming a growing concern, particularly in Brazil, Colombia, Ecuador, Peru, and Venezuela. It has been shown that foliar application of Zn can inhibit Cd uptake in some crops. To evaluate the Cd content supplied by phosphate sources and the effect of foliar Zn application, a completely randomized block design was used with a 2×4×3 factorial arrangement, the first factor corresponded to the application of the amendment (without amendment and with amendment), the second factor corresponded to the application of phosphate sources with contrasting Cd contents, and the third factor was the application of different foliar Zn doses. In the present study, it was demonstrated that juvenile cocoa plants of the CCN 51 genotype exhibit root uptake and foliar accumulation of Cd, which increases when the soil does not receive amendment or when Cd concentration in the soil increases. This led to a reduction in photosynthesis and gas exchange, a decrease in chlorophyll content and PSII quantum efficiency, and an alteration of the plant’s antioxidant enzymatic system. Additionally, it was observed that the application of a dose of 8 g L⁻¹ of Zn increased the concentration of this micronutrient in the leaves by up to sevenfold, generating a positive effect reflected in the mitigation of adverse physiological effects and the reduction of Cd accumulation in organs such as leaves, thereby decreasing the likelihood of accumulation in agronomically important organs such as cacao fruits.

MEMBROS DA BANCA:
Interno - PAULO EDUARDO RIBEIRO MARCHIORI (Suplente)
Presidente - LUIZ ROBERTO GUIMARAES GUILHERME (Membro)
Externo ao Programa - GUILHERME LOPES - DCS/ESAL (Membro)
Externo à Instituição - EVERTON GERALDO DE MORAIS - UFLA (Suplente)
Externo à Instituição - CYNTHIA DE OLIVEIRA - UFLA (Membro)