Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.12/1723
Título: Metabolic responses to water deficit in two Eucalyptus globulus clones with contrasting drought sensitivity
Autor: Shvaleva, Alla L.
Silva, Filipe Costa e
Breia, Elsa
Jouve, Laurent
Hausman, Jean-François
Almeida, Maria Helena
Maroco, João
Rodrigues, M. Lucília
Pereira, João Santos
Chaves, Maria Margarida
Palavras-chave: Antioxidant enzymes
Osmotic potential
Proline
Sugars
Water stress
Data: 2005
Editora: Oxford University Press
Citação: Tree Physiology, 26, 239-248
Resumo: We compared the metabolic responses of leaves and roots of two Eucalyptus globulus Labill. clones differing in drought sensitivity to a slowly imposed water deficit. Responses measured included changes in concentrations of soluble and insoluble sugars, proline, total protein and several antioxidant enzymes. In addition to the general decrease in growth caused by water deficit, we observed a decrease in osmotic potential when drought stress became severe. In both clones, the decrease was greater in roots than in leaves, consistent with the observed increases in concentrations of soluble sugars and proline in these organs. In roots of both clones, glutathione reductase activity increased significantly in response towater deficit, suggesting that this enzyme plays a protective role in roots during drought stress by catalyzing the catabolism of reactive oxygen species. Clone CN5 has stress avoidance mechanisms that account for its lower sensitivity to drought compared with Clone ST51.
Peer review: yes
URI: http://hdl.handle.net/10400.12/1723
ISSN: 0829-318X
Aparece nas colecções:BIOL - Artigos em revistas internacionais

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