English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/23168
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Citado 59 veces en Web of Knowledge®  |  Pub MebCentral Ver citas en PubMed Central  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Plasticity and stress tolerance override local adaptation in the responses of Mediterranean holm oak seedlings to drought and cold

AutorGimeno, Teresa E.; Pias, Beatriz; Lemos Filho, J. P.; Valladares Ros, Fernando
Palabras claveQuercus ilex
Thermal tolerance
Water use efficiency
Fecha de publicación3-dic-2008
EditorOxford University Press
CitaciónTree Physiology 29: 87-98 (2008)
ResumenPlant populations of widely distributed species experience a broad range of environmental conditions that can be faced by phenotypic plasticity or ecotypic differentiation and local adaptation. The strategy chosen will determine a population’s ability to respond to climate change. To explore this, we grew Quercus ilex (L.) seedlings from acorns collected at six selected populations from climatically contrasting localities and evaluated their response to drought and late season cold events. Maximum photosynthetic rate (Amax), instantaneous water use efficiency (iWUE), and thermal tolerance to freeze and heat (estimated from chlorophyll fluorescence versus temperature curves) were measured in 5-month-old seedlings in control (no stress), drought (water-stressed), and cold (low suboptimal temperature) conditions. The observed responses were similar for the six populations: drought decreased Amax and increased iWUE, and cold reduced Amax and iWUE. All the seedlings maintained photosynthetic activity under adverse conditions (drought and cold), and rapidly increased their iWUE by closing stomata when exposed to drought. Heat and freeze tolerances were similarly high for seedlings from all the populations, and they were significantly increased by drought and cold, respectively; and were positively related to each other. Differences in seedling performance across populations were primarily induced by maternal effects mediated by seed size and to a lesser extent by idiosyncratic physiologic responses to drought and low temperatures. Tolerance to multiple stresses together with the capacity to physiologically acclimate to heat waves and cold snaps may allow Q. ilex to cope with the increasingly stressful conditions imposed by climate change. Lack of evidence of physiologic seedling adaptation to local climate may reflect opposing selection pressures to complex, multidimensional environmental conditions operating within the distribution range of this species.
Descripción11 pages, figures, and tables statistics.
Versión del editorhttp://dx.doi.org/10.1093/treephys/tpn007
URIhttp://hdl.handle.net/10261/23168
DOI10.1093/treephys/tpn007
ISSN0829-318x
Aparece en las colecciones: (IRN) Artículos
Ficheros en este ítem:
No hay ficheros asociados a este ítem.
Mostrar el registro completo
 



NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.