Banca de DEFESA: JESSICA SUELLEN SILVA TEIXEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JESSICA SUELLEN SILVA TEIXEIRA
DATA : 27/02/2020
HORA: 08:30
LOCAL: Sala A de solos
TÍTULO:

Selenium as a mitigator of cadmium-induced stress in corn (Zea mays L.)

PALAVRAS-CHAVES:

Germination, growth, attenuation, heavy metals.

PÁGINAS: 32
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Ciência do Solo
ESPECIALIDADE: Fertilidade do Solo e Adubação
RESUMO:

Cadmium (Cd) is one of the most toxic heavy metals that occurs in the environment, it is easily absorbed by plants, even at low concentrations it is able to cause the impairment of photosynthesis and inhibition of growth. Among the alternatives to solve the problems induced by Cd contamination is the use of attenuators such as selenium (Se), which is considered a beneficial element for plants, which can increase their tolerance to various biotic and abiotic stresses. The aim of the study was to evaluate the effect of Se on germination and initial performance of corn under conditions of cadmium stress. Using hybrid maize seeds (K9606 VIP 3) treated with selenium at concentrations of 0.0; 1.5; 3.0 and 5.0 mg.L^-1 of Se in form f Na₂O₃Se, and subjected to different cadmium dosages (0.0; 1.3; 3.0 and 4.5 mg.L^-1 ) in form f CdCl₂. The following were evaluated: germination (%); the average germination time (GMT); the germination speed coefficient (CVG); the germination speed index (IVG); the length of the root; the length of the seedling; root dry mass (MSR) and shoot dry mass (MSPA). The experimental design was completely randomized in a 4 x 4 factorial scheme, with four replications, consisting of 25 subsamples each. The presence of Cd reduced germination speed index (IVG), root growth, seedling growth and root dry mass with increasing concentrations. In general, pretreatment with Se prior to exposure to Cd promoted increased root growth, seedling growth and root dry mass production and marked mitigation of cadmium-induced growth inhibition, especially at the dose 5 mg.L^-1 of Se.

MEMBROS DA BANCA:
Presidente - 1970202 - RICARDO SHIGUERU OKUMURA
Externo ao Programa - 2595267 - CANDIDO FERREIRA DE OLIVEIRA NETO
Externo à Instituição - GLAUCO ANDRÉ DOS SANTOS NOGUEIRA - UFRA
Externo à Instituição - WALDEMAR VIANA DE ANDRADE JÚNIOR - SEMAS