Functional relationships between hydraulic traits and the timing of diurnal depression of photosynthesis

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 trait...

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Autores principales:	Bucci, S.J., Carbonell Silletta, L.M., Garré, A., Cavallaro, A., Efron, S.T., Arias, N.S., Goldstein, G., Scholz, F.G.
Formato:	INPR
Materias:	Andean forests leaf hydraulic conductance leaf hydraulic vulnerability photosynthesis safety margin turgor
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_01407791_v_n_p_Bucci
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_01407791_v_n_p_Bucci
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spelling	todo:paper_01407791_v_n_p_Bucci2023-10-03T14:58:31Z Functional relationships between hydraulic traits and the timing of diurnal depression of photosynthesis Bucci, S.J. Carbonell Silletta, L.M. Garré, A. Cavallaro, A. Efron, S.T. Arias, N.S. Goldstein, G. Scholz, F.G. Andean forests leaf hydraulic conductance leaf hydraulic vulnerability photosynthesis safety margin turgor 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 INPR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01407791_v_n_p_Bucci
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Andean forests leaf hydraulic conductance leaf hydraulic vulnerability photosynthesis safety margin turgor
spellingShingle	Andean forests leaf hydraulic conductance leaf hydraulic vulnerability photosynthesis safety margin turgor 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
topic_facet	Andean forests leaf hydraulic conductance leaf hydraulic vulnerability photosynthesis safety margin turgor
description	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
format	INPR
author	Bucci, S.J. Carbonell Silletta, L.M. Garré, A. Cavallaro, A. Efron, S.T. Arias, N.S. Goldstein, G. Scholz, F.G.
author_facet	Bucci, S.J. Carbonell Silletta, L.M. Garré, A. Cavallaro, A. Efron, S.T. Arias, N.S. Goldstein, G. Scholz, F.G.
author_sort	Bucci, S.J.
title	Functional relationships between hydraulic traits and the timing of diurnal depression of photosynthesis
title_short	Functional relationships between hydraulic traits and the timing of diurnal depression of photosynthesis
title_full	Functional relationships between hydraulic traits and the timing of diurnal depression of photosynthesis
title_fullStr	Functional relationships between hydraulic traits and the timing of diurnal depression of photosynthesis
title_full_unstemmed	Functional relationships between hydraulic traits and the timing of diurnal depression of photosynthesis
title_sort	functional relationships between hydraulic traits and the timing of diurnal depression of photosynthesis
url	http://hdl.handle.net/20.500.12110/paper_01407791_v_n_p_Bucci
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Functional relationships between hydraulic traits and the timing of diurnal depression of photosynthesis

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