Hydraulic differences along the water transport system of South American Nothofagus species: Do leaves protect the stem functionality?
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...
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todo:paper_0829318X_v32_n7_p880_Bucci2023-10-03T15:40:05Z Hydraulic differences along the water transport system of South American Nothofagus species: Do leaves protect the stem functionality? 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. 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 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. Fil:Bucci, S.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Scholz, F.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Campanello, P.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Montti, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Manna, L.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Goldstein, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0829318X_v32_n7_p880_Bucci |
| institution |
Universidad de Buenos Aires |
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I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 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? |
| topic_facet |
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 |
| description |
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. |
| format |
JOUR |
| author |
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. |
| author_facet |
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. |
| author_sort |
Bucci, S.J. |
| title |
Hydraulic differences along the water transport system of South American Nothofagus species: Do leaves protect the stem functionality? |
| title_short |
Hydraulic differences along the water transport system of South American Nothofagus species: Do leaves protect the stem functionality? |
| title_full |
Hydraulic differences along the water transport system of South American Nothofagus species: Do leaves protect the stem functionality? |
| title_fullStr |
Hydraulic differences along the water transport system of South American Nothofagus species: Do leaves protect the stem functionality? |
| title_full_unstemmed |
Hydraulic differences along the water transport system of South American Nothofagus species: Do leaves protect the stem functionality? |
| title_sort |
hydraulic differences along the water transport system of south american nothofagus species: do leaves protect the stem functionality? |
| url |
http://hdl.handle.net/20.500.12110/paper_0829318X_v32_n7_p880_Bucci |
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