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Abstract:

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.

Registro:

Documento: Artículo
Título:The cost of avoiding freezing in stems: Trade-off between xylem resistance to cavitation and supercooling capacity in woody plants
Autor:Arias, N.S.; Scholz, F.G.; Goldstein, G.; Bucci, S.J.
Filiación:Instituto de Biociencias de la Patagonia (INBIOP), Consejo Nacional de Investigaciones Científicas Cnicas (CONICET), Universidad Nacional de la Patagonia San Juan Bosco (UNPSJB), Comodoro Rivadavia, Argentina
Grupo de Estudios Biofísicos y Eco-fisiológicos (GEBEF), UNPSJB, Comodoro Rivadavia, Argentina
Instituto de Ecología, Gentica y Evolución de Buenos Aires (IEGEBA-CONICET-Universidad de Buenos Aires (UBA), Buenos Aires, Argentina
Laboratorio de Ecología Funcional (LEF), UBA, Buenos Aires, Argentina
Department of Biology, University of Miami, PO Box 249118, Coral Gables, FL 33124, United States
Palabras clave: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
Año:2017
Volumen:37
Número:9
Página de inicio:1251
Página de fin:1262
DOI: http://dx.doi.org/10.1093/treephys/tpx071
Título revista:Tree Physiology
Título revista abreviado:Tree Physiol.
ISSN:0829318X
CODEN:TRPHE
CAS:water, 7732-18-5; Water
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0829318X_v37_n9_p1251_Arias

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Citas:

---------- APA ----------
Arias, N.S., Scholz, F.G., Goldstein, G. & Bucci, S.J. (2017) . The cost of avoiding freezing in stems: Trade-off between xylem resistance to cavitation and supercooling capacity in woody plants. Tree Physiology, 37(9), 1251-1262.
http://dx.doi.org/10.1093/treephys/tpx071
---------- CHICAGO ----------
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" . Tree Physiology 37, no. 9 (2017) : 1251-1262.
http://dx.doi.org/10.1093/treephys/tpx071
---------- MLA ----------
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" . Tree Physiology, vol. 37, no. 9, 2017, pp. 1251-1262.
http://dx.doi.org/10.1093/treephys/tpx071
---------- VANCOUVER ----------
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. Tree Physiol. 2017;37(9):1251-1262.
http://dx.doi.org/10.1093/treephys/tpx071