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Abstract:

Hydraulic architecture was studied in shrub species differing in rooting depth in a cold desert in Southern Argentina. All species exhibited strong hydraulic segmentation between leaves, stems and roots with leaves being the most vulnerable part of the hydraulic pathway. Two types of safety margins describing the degree of conservation of the hydraulic integrity were used: the difference between minimum stem or leaf water potential (Ψ) and the Ψ at which stem or leaf hydraulic function was reduced by 50% (Ψ - Ψ50), and the difference between leaf and stem Ψ50. Leaf Ψ50 - stem Ψ50 increased with decreasing rooting depth. Large diurnal decreases in root-specific hydraulic conductivity suggested high root vulnerability to embolism across all species. Although stem Ψ50 became more negative with decreasing species-specific Ψsoil and minimum stem Ψ, leaf Ψ50 was independent of Ψ and minimum leaf Ψ. Species with embolism-resistant stems also had higher maximum stem hydraulic conductivity. Safety margins for stems were >2.1MPa, whereas those for leaves were negative or only slightly positive. Leaves acted as safety valves to protect the integrity of the upstream hydraulic pathway, whereas embolism in lateral roots may help to decouple portions of the plant from the impact of drier soil layers. © 2013 John Wiley & Sons Ltd.

Registro:

Documento: Artículo
Título:The stem xylem of Patagonian shrubs operates far from the point of catastrophic dysfunction and is additionally protected from drought-induced embolism by leaves and roots
Autor:Bucci, S.J.; Scholz, F.G.; Peschiutta, M.L.; Arias, N.S.; Meinzer, F.C.; Goldstein, G.
Filiación:Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), 1917 Buenos Aires, Argentina
Grupo de Estudios Biofísicos y Eco-fisiológicos (GEBEF), Departamento de Biología, Facultad de Ciencias Naturales, Universidad Nacional de la Patagonia San Juan Bosco, 9000 Comodoro Rivadavia, Argentina
USDA Forest Service, Forestry Sciences Laboratory, 3200 SW Jefferson Way, Corvallis, OR 97331, United States
Laboratorio de Ecología Funcional (LEF), Departamento de Ecología, Genética y Evolución, FCEyN, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
University of Miami, Department of Biology, P.O. Box 249118, Coral Gables, FL 33124, United States
Palabras clave:Hydraulic conductivity; Hydraulic segmentation; Leaf water potential; Safety margin; hydraulic conductivity; leaf; root system; rooting; shrub; stem; xylem; Argentina; water; Argentina; article; circadian rhythm; drought; hydraulic conductivity; hydraulic segmentation; leaf water potential; physiology; plant leaf; plant physiology; plant root; plant stem; safety margin; xylem; hydraulic conductivity; hydraulic segmentation; leaf water potential; safety margin; Argentina; Circadian Rhythm; Droughts; Plant Leaves; Plant Physiological Phenomena; Plant Roots; Plant Stems; Water; Xylem
Año:2013
Volumen:36
Número:12
Página de inicio:2163
Página de fin:2174
DOI: http://dx.doi.org/10.1111/pce.12126
Título revista:Plant, Cell and Environment
Título revista abreviado:Plant Cell Environ.
ISSN:01407791
CODEN:PLCED
CAS:water, 7732-18-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01407791_v36_n12_p2163_Bucci

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Citas:

---------- APA ----------
Bucci, S.J., Scholz, F.G., Peschiutta, M.L., Arias, N.S., Meinzer, F.C. & Goldstein, G. (2013) . The stem xylem of Patagonian shrubs operates far from the point of catastrophic dysfunction and is additionally protected from drought-induced embolism by leaves and roots. Plant, Cell and Environment, 36(12), 2163-2174.
http://dx.doi.org/10.1111/pce.12126
---------- CHICAGO ----------
Bucci, S.J., Scholz, F.G., Peschiutta, M.L., Arias, N.S., Meinzer, F.C., Goldstein, G. "The stem xylem of Patagonian shrubs operates far from the point of catastrophic dysfunction and is additionally protected from drought-induced embolism by leaves and roots" . Plant, Cell and Environment 36, no. 12 (2013) : 2163-2174.
http://dx.doi.org/10.1111/pce.12126
---------- MLA ----------
Bucci, S.J., Scholz, F.G., Peschiutta, M.L., Arias, N.S., Meinzer, F.C., Goldstein, G. "The stem xylem of Patagonian shrubs operates far from the point of catastrophic dysfunction and is additionally protected from drought-induced embolism by leaves and roots" . Plant, Cell and Environment, vol. 36, no. 12, 2013, pp. 2163-2174.
http://dx.doi.org/10.1111/pce.12126
---------- VANCOUVER ----------
Bucci, S.J., Scholz, F.G., Peschiutta, M.L., Arias, N.S., Meinzer, F.C., Goldstein, G. The stem xylem of Patagonian shrubs operates far from the point of catastrophic dysfunction and is additionally protected from drought-induced embolism by leaves and roots. Plant Cell Environ. 2013;36(12):2163-2174.
http://dx.doi.org/10.1111/pce.12126