Artículo

Bucci, S.J.; Scholz, F.G.; Campanello, P.I.; Montti, L.; Jimenez-Castillo, M.; Rockwell, F.A.; Manna, L.L.; Guerra, P.; Bernal, P.L.; Troncoso, O.; Enricci, J.; Holbrook, M.N.; Goldstein, G. "Hydraulic differences along the water transport system of South American Nothofagus species: Do leaves protect the stem functionality?" (2012) Tree Physiology. 32(7):880-893
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Abstract:

Hydraulic traits were studied for six Nothofagus species from South America (Argentina and Chile), and for three of these species two populations were studied. The main goal was to determine if properties of the water conductive pathway in stems and leaves are functionally coordinated and to assess if leaves are more vulnerable to cavitation than stems, consistent with the theory of hydraulic segmentation along the vascular system of trees in ecosystems subject to seasonal drought. Vulnerability to cavitation, hydraulic conductivity of stems and leaves, leaf water potential, wood density and leaf water relations were examined. Large variations in vulnerability to cavitation of stems and leaves were observed across populations and species, but leaves were consistently more vulnerable than stems. Water potential at 50 loss of maximum hydraulic efficiency (P50) ranged from-0.94 to-2.44MPa in leaves and from-2.6 to-5.3MPa in stems across species and populations. Populations in the driest sites had sapwood and leaves more vulnerable to cavitation than those grown in the wettest sites. Stronger diurnal down-regulation in leaf hydraulic conductance compared with stem hydraulic conductivity apparently has the function to slow down potential water loss in stems and protect stem hydraulics from cavitation. Species-specific differences in wood density and leaf hydraulic conductance (KLeaf) were observed. Both traits were functionally related: species with higher wood density had lower KLeaf. Other stem and leaf hydraulic traits were functionally coordinated, resulting in Nothofagus species with an efficient delivery of water to the leaves. The integrity of the more expensive woody portion of the water transport pathway can thus be maintained at the expense of the replaceable portion (leaves) of the stem-leaf continuum under prolonged drought. Compensatory adjustments between hydraulic traits may help to decrease the rate of embolism formation in the trees more vulnerable to cavitation. © 2012 The Author.

Registro:

Documento: Artículo
Título:Hydraulic differences along the water transport system of South American Nothofagus species: Do leaves protect the stem functionality?
Autor:Bucci, S.J.; Scholz, F.G.; Campanello, P.I.; Montti, L.; Jimenez-Castillo, M.; Rockwell, F.A.; Manna, L.L.; Guerra, P.; Bernal, P.L.; Troncoso, O.; Enricci, J.; Holbrook, M.N.; Goldstein, G.
Filiación:Grupo de Estudios Biofísicos y Eco-fisiológicos (GEBEF), Universidad Nacional de la Patagonia San Juan Bosco, (9000) Comodoro Rivadavia, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
Laboratorio de Ecología Funcional, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Instituto de Biología Subtropical, Facultad de Ciencias Forestales, Universidad Nacional de Misiones, Puerto Iguazú, Argentina
Laboratorio de Ecología Funcional Vegetal, Instituto de Ciencias Ambientales y Evolutivas, Universidad Austral de Chile, Valdivia, Chile
Department of Organismic and Evolutionary Biology, University of Harvard, Cambridge, MA 02138, United States
Departamento de Ingeniería Forestal, Universidad Nacional de la Patagonia San Juan Bosco, Esquel, Argentina
Centro de Investigación y Extensión Forestal Andino Patagónico, Esquel, Argentina
Department of Biology, University of Miami, Coral Gables, FL 33124, United States
Palabras clave:congeneric species; hydraulic conductivity; leaf hydraulic conductance; vulnerability to cavitation; water relations; rain; water; cavitation; compensation; deciduous tree; evergreen tree; hydraulic conductivity; interpopulation variation; interspecific variation; leaf; life history trait; plant water relations; stem; stomatal conductance; translocation; vulnerability; water flow; altitude; angiosperm; article; humidity; metabolism; physiology; plant leaf; plant stem; soil; South America; species difference; temperature; transport at the cellular level; wood; Altitude; Angiosperms; Biological Transport; Humidity; Plant Leaves; Plant Stems; Rain; Soil; South America; Species Specificity; Temperature; Water; Wood; Argentina; Chile; Nothofagus
Año:2012
Volumen:32
Número:7
Página de inicio:880
Página de fin:893
DOI: http://dx.doi.org/10.1093/treephys/tps054
Título revista:Tree Physiology
Título revista abreviado:Tree Physiol.
ISSN:0829318X
CODEN:TRPHE
CAS:water, 7732-18-5; Soil; Water, 7732-18-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0829318X_v32_n7_p880_Bucci

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Citas:

---------- APA ----------
Bucci, S.J., Scholz, F.G., Campanello, P.I., Montti, L., Jimenez-Castillo, M., Rockwell, F.A., Manna, L.L.,..., Goldstein, G. (2012) . Hydraulic differences along the water transport system of South American Nothofagus species: Do leaves protect the stem functionality?. Tree Physiology, 32(7), 880-893.
http://dx.doi.org/10.1093/treephys/tps054
---------- CHICAGO ----------
Bucci, S.J., Scholz, F.G., Campanello, P.I., Montti, L., Jimenez-Castillo, M., Rockwell, F.A., et al. "Hydraulic differences along the water transport system of South American Nothofagus species: Do leaves protect the stem functionality?" . Tree Physiology 32, no. 7 (2012) : 880-893.
http://dx.doi.org/10.1093/treephys/tps054
---------- MLA ----------
Bucci, S.J., Scholz, F.G., Campanello, P.I., Montti, L., Jimenez-Castillo, M., Rockwell, F.A., et al. "Hydraulic differences along the water transport system of South American Nothofagus species: Do leaves protect the stem functionality?" . Tree Physiology, vol. 32, no. 7, 2012, pp. 880-893.
http://dx.doi.org/10.1093/treephys/tps054
---------- VANCOUVER ----------
Bucci, S.J., Scholz, F.G., Campanello, P.I., Montti, L., Jimenez-Castillo, M., Rockwell, F.A., et al. Hydraulic differences along the water transport system of South American Nothofagus species: Do leaves protect the stem functionality?. Tree Physiol. 2012;32(7):880-893.
http://dx.doi.org/10.1093/treephys/tps054