Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/1120
Título: Avaliação de stress oxidativo em bagos de videira (Vitis vinifera L.) da casta Trincadeira em condições de stress hídrico
Autor: Carvalho, Inês Sequeira de
Orientador: Martins, Maria Luísa Louro
Francisco, Rita Maria de Brito
Palavras-chave: vitis vinifera
antioxidant enzymes
drought stress
grape skin
oxidatiive stress
ripening stage
enzimas antioxidantes
estado de maturação
pelicula do bago
stress hídrico
stress oxidativo
Data de Defesa: 2009
Resumo: The plants respond to oxidative stress with the activation of defensive antioxidants mechanisms, which come up as an integrative part of the drought stress tolerance strategies. With this work it was attempted to evaluate oxidative stress caused by three different irrigation treatments – NI (non irrigated), RDI (Regulated Deficit Irrigation) and FI (Full Irrigation) – in the skin of Vitis vinifera L. cv ‘Trincadeira’ grapes, throughout ripening process. The activity of guaiacol peroxidase (POD), poliphenol oxidase (PPO), ascorbate peroxidase (APX), glutathione reductase (GR) and catalase (CAT) was determined on different stages of ripening. Higher levels of drought stress were found in NI treatment, with the highest average levels of POD activity, and have originated possibly a major incidence of oxidative stress, followed by RDI and FI treatments, where the level of drought stress was respectively minor. Water availability seems to affect the plant’s response to the accumulation of ROS on the different stages of ripening, showing a more efficient response on the final stage in NI treatment and on vérasion on RDI and FI treatments, which may indicate a higher investment of the plant on the final stage of the reproductive cycle under limited water availability.
Descrição: Mestrado em Engenharia Agronómica - Hortofruticultura e Viticultura - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/1120
Aparece nas colecções:BISA - Dissertações de Mestrado / Master Thesis

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
TESEINÊS.pdf695,17 kBAdobe PDFVer/Abrir


FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote Degois 

Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.