Bucci, S.J.; Carbonell Silletta, L.M.; Garré, A.; Cavallaro, A.; Efron, S.T.; Arias, N.S.; Goldstein, G.; Scholz, F.G. "Functional relationships between hydraulic traits and the timing of diurnal depression of photosynthesis" (2019) Plant Cell and Environment
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The hydraulic coordination along the water transport pathway helps trees provide adequate water supply to the canopy, ensuring that water deficits are minimized and that stomata remain open for CO2 uptake. We evaluated the stem and leaf hydraulic coordination and the linkages between hydraulic traits and the timing of diurnal depression of photosynthesis across seven evergreen tree species in the southern Andes. There was a positive correlation between stem hydraulic conductivity (ks) and leaf hydraulic conductance (KLeaf) across species. All species had similar maximum photosynthetic rates (Amax). The species with higher ks and KLeaf attained Amax in the morning, whereas the species with lower ks and KLeaf exhibited their Amax in the early afternoon concurrently with turgor loss. These latter species had very negative leaf water potentials, but far from the pressure at which the 88% of leaf hydraulic conductance is lost. Our results suggest that diurnal gas exchange dynamics may be determined by leaf hydraulic vulnerability such that a species more vulnerable to drought restrict water loss and carbon assimilation earlier than species less vulnerable. However, under stronger drought, species with earlier CO2 uptake depression may increase the risk of hydraulic failure, as their safety margins are relatively narrow. © 2019 John Wiley & Sons Ltd


Documento: Artículo
Título:Functional relationships between hydraulic traits and the timing of diurnal depression of photosynthesis
Autor:Bucci, S.J.; Carbonell Silletta, L.M.; Garré, A.; Cavallaro, A.; Efron, S.T.; Arias, N.S.; Goldstein, G.; Scholz, F.G.
Filiación:Grupo de Estudios Biofísicos y Ecofisiológicos (GEBEF), Instituto de Biociencias de la Patagonia (INBIOP), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Universidad Nacional de la Patagonia San Juan Bosco (UNPSJB), Comodoro Rivadavia, 9000, Argentina
Departamento de Biología, Universidad Nacional de la Patagonia San Juan Bosco (UNPSJB), Comodoro Rivadavia, 9000, Argentina
Instituto de Ecología, Genética y Evolución de Buenos Aires, UBA-CONICET, Buenos Aires, Argentina
Department of Biology, University of Miami, Coral Gables, FL, United States
Palabras clave:Andean forests; leaf hydraulic conductance; leaf hydraulic vulnerability; photosynthesis; safety margin; turgor
Título revista:Plant Cell and Environment
Título revista abreviado:Plant Cell Environ.


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---------- APA ----------
Bucci, S.J., Carbonell Silletta, L.M., Garré, A., Cavallaro, A., Efron, S.T., Arias, N.S., Goldstein, G.,..., Scholz, F.G. (2019) . Functional relationships between hydraulic traits and the timing of diurnal depression of photosynthesis. Plant Cell and Environment.
---------- CHICAGO ----------
Bucci, S.J., Carbonell Silletta, L.M., Garré, A., Cavallaro, A., Efron, S.T., Arias, N.S., et al. "Functional relationships between hydraulic traits and the timing of diurnal depression of photosynthesis" . Plant Cell and Environment (2019).
---------- MLA ----------
Bucci, S.J., Carbonell Silletta, L.M., Garré, A., Cavallaro, A., Efron, S.T., Arias, N.S., et al. "Functional relationships between hydraulic traits and the timing of diurnal depression of photosynthesis" . Plant Cell and Environment, 2019.
---------- VANCOUVER ----------
Bucci, S.J., Carbonell Silletta, L.M., Garré, A., Cavallaro, A., Efron, S.T., Arias, N.S., et al. Functional relationships between hydraulic traits and the timing of diurnal depression of photosynthesis. Plant Cell Environ. 2019.