The cost of avoiding freezing in stems: Trade-off between xylem resistance to cavitation and supercooling capacity in woody plants

Stems and leaves of Olea europaea L. (olive) avoid freezing damage by substantial supercooling during the winter season. Physiological changes during acclimation to low temperatures were studied in five olive cultivars. Water relations and hydraulic traits, ice nucleation temperature (INT) and tempe...

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Autores principales:	Arias, N.S., Scholz, F.G., Goldstein, G., Bucci, S.J.
Formato:	JOUR
Materias:	Cold acclimation hydraulic conductivity ice nucleation temperature Olea europaea sap flow stomatal conductance acclimation cavitation cold tolerance cooling cultivar evergreen tree freezing low temperature nucleation physiology stem trade-off woody plant xylem Argentina Patagonia water plant leaf plant stem season wood Freezing Plant Leaves Plant Stems Seasons Water Wood Xylem
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_0829318X_v37_n9_p1251_Arias
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_0829318X_v37_n9_p1251_Arias
record_format	dspace
spelling	todo:paper_0829318X_v37_n9_p1251_Arias2023-10-03T15:40:08Z The cost of avoiding freezing in stems: Trade-off between xylem resistance to cavitation and supercooling capacity in woody plants Arias, N.S. Scholz, F.G. Goldstein, G. Bucci, S.J. Cold acclimation hydraulic conductivity ice nucleation temperature Olea europaea sap flow stomatal conductance acclimation cavitation cold tolerance cooling cultivar evergreen tree freezing hydraulic conductivity low temperature nucleation physiology sap flow stem stomatal conductance trade-off woody plant xylem Argentina Patagonia Olea europaea water Argentina freezing physiology plant leaf plant stem season wood xylem Argentina Freezing Plant Leaves Plant Stems Seasons Water Wood Xylem Stems and leaves of Olea europaea L. (olive) avoid freezing damage by substantial supercooling during the winter season. Physiological changes during acclimation to low temperatures were studied in five olive cultivars. Water relations and hydraulic traits, ice nucleation temperature (INT) and temperatures resulting in 50% damage (LT50) were determined. All cultivars showed a gradual decrease in INT and LT50 from the dry and warm summer to the wet and cold winter in Patagonia, Argentina. During acclimation to low temperatures there was an increase in leaf cell wall rigidity and stomatal conductance (gs), as well as a decrease in leaf apoplastic water content, leaf water potential (?), sap flow and stem hydraulic conductivity (ks). More negative ? as a consequence of high gs and detrimental effects of low temperatures on root activity resulted in a substantial loss of ks due to embolism formation. Seasonal stem INT decrease from summer to winter was directly related to the xylem resistance to cavitation, determined by the loss of ks across cultivars. Thus the loss of freezable water in xylem vessels by embolisms increased stem supercooling capacity and delayed ice propagation from stems to the leaves. For the first time, a trade-off between xylem resistance to cavitation and stem and leaf supercooling capacity was observed in plants that avoid extracellular freezing by permanent supercooling. The substantial loss of hydraulic function in olive cultivar stems by embolism formation with their high repair costs are compensated by avoiding plant damage at very low subzero temperatures. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0829318X_v37_n9_p1251_Arias
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Cold acclimation hydraulic conductivity ice nucleation temperature Olea europaea sap flow stomatal conductance acclimation cavitation cold tolerance cooling cultivar evergreen tree freezing hydraulic conductivity low temperature nucleation physiology sap flow stem stomatal conductance trade-off woody plant xylem Argentina Patagonia Olea europaea water Argentina freezing physiology plant leaf plant stem season wood xylem Argentina Freezing Plant Leaves Plant Stems Seasons Water Wood Xylem
spellingShingle	Cold acclimation hydraulic conductivity ice nucleation temperature Olea europaea sap flow stomatal conductance acclimation cavitation cold tolerance cooling cultivar evergreen tree freezing hydraulic conductivity low temperature nucleation physiology sap flow stem stomatal conductance trade-off woody plant xylem Argentina Patagonia Olea europaea water Argentina freezing physiology plant leaf plant stem season wood xylem Argentina Freezing Plant Leaves Plant Stems Seasons Water Wood Xylem Arias, N.S. Scholz, F.G. Goldstein, G. Bucci, S.J. The cost of avoiding freezing in stems: Trade-off between xylem resistance to cavitation and supercooling capacity in woody plants
topic_facet	Cold acclimation hydraulic conductivity ice nucleation temperature Olea europaea sap flow stomatal conductance acclimation cavitation cold tolerance cooling cultivar evergreen tree freezing hydraulic conductivity low temperature nucleation physiology sap flow stem stomatal conductance trade-off woody plant xylem Argentina Patagonia Olea europaea water Argentina freezing physiology plant leaf plant stem season wood xylem Argentina Freezing Plant Leaves Plant Stems Seasons Water Wood Xylem
description	Stems and leaves of Olea europaea L. (olive) avoid freezing damage by substantial supercooling during the winter season. Physiological changes during acclimation to low temperatures were studied in five olive cultivars. Water relations and hydraulic traits, ice nucleation temperature (INT) and temperatures resulting in 50% damage (LT50) were determined. All cultivars showed a gradual decrease in INT and LT50 from the dry and warm summer to the wet and cold winter in Patagonia, Argentina. During acclimation to low temperatures there was an increase in leaf cell wall rigidity and stomatal conductance (gs), as well as a decrease in leaf apoplastic water content, leaf water potential (?), sap flow and stem hydraulic conductivity (ks). More negative ? as a consequence of high gs and detrimental effects of low temperatures on root activity resulted in a substantial loss of ks due to embolism formation. Seasonal stem INT decrease from summer to winter was directly related to the xylem resistance to cavitation, determined by the loss of ks across cultivars. Thus the loss of freezable water in xylem vessels by embolisms increased stem supercooling capacity and delayed ice propagation from stems to the leaves. For the first time, a trade-off between xylem resistance to cavitation and stem and leaf supercooling capacity was observed in plants that avoid extracellular freezing by permanent supercooling. The substantial loss of hydraulic function in olive cultivar stems by embolism formation with their high repair costs are compensated by avoiding plant damage at very low subzero temperatures.
format	JOUR
author	Arias, N.S. Scholz, F.G. Goldstein, G. Bucci, S.J.
author_facet	Arias, N.S. Scholz, F.G. Goldstein, G. Bucci, S.J.
author_sort	Arias, N.S.
title	The cost of avoiding freezing in stems: Trade-off between xylem resistance to cavitation and supercooling capacity in woody plants
title_short	The cost of avoiding freezing in stems: Trade-off between xylem resistance to cavitation and supercooling capacity in woody plants
title_full	The cost of avoiding freezing in stems: Trade-off between xylem resistance to cavitation and supercooling capacity in woody plants
title_fullStr	The cost of avoiding freezing in stems: Trade-off between xylem resistance to cavitation and supercooling capacity in woody plants
title_full_unstemmed	The cost of avoiding freezing in stems: Trade-off between xylem resistance to cavitation and supercooling capacity in woody plants
title_sort	cost of avoiding freezing in stems: trade-off between xylem resistance to cavitation and supercooling capacity in woody plants
url	http://hdl.handle.net/20.500.12110/paper_0829318X_v37_n9_p1251_Arias
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The cost of avoiding freezing in stems: Trade-off between xylem resistance to cavitation and supercooling capacity in woody plants

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