Banca de QUALIFICAÇÃO: SANIELY MARIA BEZERRA DE MELO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : SANIELY MARIA BEZERRA DE MELO
DATA : 03/11/2016
HORA: 15:00
LOCAL: Anfiteatro dos répteis - CB
TÍTULO:

Physiological and oxidative changes during the storage of Moringa oleifera Lam. seeds

PALAVRAS-CHAVES:

Antioxidant enzymes; Hydrogen peroxide; Lipid peroxidation; Non-enzymatic antioxidants; Seed deterioration.

PÁGINAS: 39
GRANDE ÁREA: Ciências Agrárias
ÁREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Silvicultura
ESPECIALIDADE: Sementes Florestais
RESUMO:

Oxidative damage plays a central role in seed deterioration during storage. Thus, the current work aimed to characterize viability and vigor as well as oxidative damage and protection during the storage of Moringa oleifera Lam. (moringa) seeds. Seeds were kept in  plastic bags and stored in a growth chamber (27 ± 2°C and RH 65%) and under refrigeration (4 ± 2°C and RH 25%) for twelve months. Samples were collected after havest and every three months during  storage, evaluating water content, germination percentage, first count, germination speed index, percentage of abnormal seedlings, lipid peroxidation, H₂O₂ content, total, reduced and oxidized ascorbate content, as the activity of superoxide dismutase, ascorbate peroxidase and phenol peroxidase. In the seeds stored in the growth chamber, there was an increase in water content and percentage of abnormal seedlings after twelve months of storage in parallel with a decrease in germination percentage, first count and germination speed index, compared with the refrigerated environment. Regardless the environment, moringa seeds did not show an  increase in  lipid peroxidation, but there was a decrease in H₂O₂ content, coinciding with an increase in reduced ascorbate content and superoxide dismutase and ascorbate peroxidase activities. Thus, the refrigerated environment is more suitable for the storage of moringa seeds compared with the growth chamber, taking into account the changes in water content, viability, and vigor of seeds. However, these changes can not be attributed to lipid peroxidation during the experimental period. Instead of this, the decrease of H₂O₂ content over time may be related to oxidative protection supported by reduced ascorbate, superoxide dismutase and ascorbate peroxidase. 

MEMBROS DA BANCA:
Presidente - 1228866 - EDUARDO LUIZ VOIGT
Interno - 1721230 - MAURO VASCONCELOS PACHECO
Interno - 1605704 - SIDNEY CARLOS PRAXEDES