Banca de QUALIFICAÇÃO: MARCELA PEREIRA LOURINHO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : MARCELA PEREIRA LOURINHO
DATA : 27/12/2019
HORA: 09:00
LOCAL: SALA 05 DA PÓS-FLORESTA
TÍTULO:

CARBON AND NITROGEN METABOLISM IN Khaya ivorensis A. Chev. IN DIFFERENT CONCENTRATIONS OF CASHIO AND BY MITIGATION OF SILENCE STRESS.

PALAVRAS-CHAVES:

heavy metals, African mahogany, phytoremediation.

PÁGINAS: 45
GRANDE ÁREA: Ciências Agrárias
ÁREA: Recursos Florestais e Engenharia Florestal
RESUMO:

Cadmium (Cd) is one of the most toxic heavy metals for plants and animals and has the highest soil accumulation rates. There has been a growing environmental awareness over the years, followed by an increased interest in research on tree species aiming at the recovery of degraded areas. Phytoremediation aims at the recovery of soils contaminated by heavy metals using plants. African mahogany (Khaya ivorensis A. Chev), which belongs to the Meliaceae botanical family and has noble wood of great economic potential for commercialization. Silicon (Si) is used as a beneficial nutrient, acting as a stress attenuator, this mineral seems to involve the regulation of detoxification processes. The objective of this research is to evaluate the effects of cadmium and silicon on carbon and nitrogen metabolism of the shoot and root system and Si responses on the metabolism of African mahogany, aiming at the phytoremediation capacity of this species to Cd. Federal Rural da Amazônia and the experimental design was a randomized block design in a 4x4 factorial scheme with five replications, and the factors constituted by increasing levels of heavy metal (Cd 0, 25, 50 and 75 mg L-1) and silicon doses. (Si 0, 100, 150 and 300 mg L-1), the obtained data were submitted to statistical analysis through the application “Statical Analysis System” (SAS INSTITUTE, 2000). Treatment with Cd 75 mg L-1 generated the largest accumulations of the leaf metal reaching maximum values of 57 mg g-1 MS through the analysis of cadmium bioaccumulation factor (FB). The maximum translocation factor (TF) found was 4.2 mg g-1MS in the Cd 75 mg L-1 treatment being 38% higher when compared to the control treatment and the Cd tolerance index (IT) was minimal. Silicon concentration in dry matter (DM) was not affected by doses 25 mg L-1 and 50 mg L-1, only Cd 75 mg L-1 negatively affected Si concentrations in plants. Cd generates changes in biochemical metabolism due to its toxicity.

MEMBROS DA BANCA:
Presidente - 2595267 - CANDIDO FERREIRA DE OLIVEIRA NETO
Externo ao Programa - 1315246 - JOZE MELISA NUNES DE FREITAS
Externo à Instituição - WALDEMAR VIANA DE ANDRADE JÚNIOR - SEMAS
Externo à Instituição - MONYCK JEANE DOS SANTOS LOPES - MPEG