Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.12/1725
Título: Responses to water stress in two Eucalyptus globulus clones differing in drought tolerance
Autor: Silva, Filipe Costa e
Shvaleva, Alla L.
Maroco, João
Chaves, Maria Manuela
Pereira, João Santos
Palavras-chave: Acclimation
Hydraulic properties
Root growth
Water stress
Data: 2004
Editora: Oxford University Press
Citação: Tree Physiology, 24, 1165-1172
Resumo: We evaluated drought resistance mechanisms in a drought-tolerant clone (CN5) and a drought-sensitive clone (ST51) of Eucalyptus globulus Labill. based on the responses to drought of some physiological, biophysical and morphological characteristics of container-grown plants, with particular emphasis on root growth and hydraulic properties. Water loss in excess of that supplied to the containers led to a general decrease in growth and significant reductions in leaf area ratio, specific leaf area and leaf-to-root area ratio. Root hydraulic conductance and leaf-specific hydraulic conductance decreased aswater stress became more severe. During the experiment, the drought-resistant CN5 clone maintained higher leaf water status (higher predawn and midday leaf water potentials), sustained a higher growth rate (new leaf area expansion and root growth) and displayed greater carbon allocation to the root system and lower leaf-to-root area ratio than the droughtsensitive ST51 clone. Clone CN5 possessed higher stomatal conductances at moderate stress as well as higher hydraulic conductances than Clone ST51. Differences in the response to drought in root biomass, coupled with changes in hydraulic properties, accounted for the clonal differences in drought tolerance, allowing Clone CN5 to balance transpiration andwater absorption during drought treatment and thereby prolong the period of active carbon assimilation.
Peer review: yes
URI: http://hdl.handle.net/10400.12/1725
ISSN: 0829-318X
Aparece nas colecções:BIOL - Artigos em revistas internacionais

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