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
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...
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todo:paper_01407791_v36_n12_p2163_Bucci2023-10-03T14:58:28Z 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 Bucci, S.J. Scholz, F.G. Peschiutta, M.L. Arias, N.S. Meinzer, F.C. Goldstein, G. 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 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. Fil:Bucci, S.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Scholz, F.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Goldstein, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01407791_v36_n12_p2163_Bucci |
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Universidad de Buenos Aires |
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I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 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 |
| topic_facet |
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 |
| description |
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. |
| format |
JOUR |
| author |
Bucci, S.J. Scholz, F.G. Peschiutta, M.L. Arias, N.S. Meinzer, F.C. Goldstein, G. |
| author_facet |
Bucci, S.J. Scholz, F.G. Peschiutta, M.L. Arias, N.S. Meinzer, F.C. Goldstein, G. |
| author_sort |
Bucci, S.J. |
| title |
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 |
| title_short |
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 |
| title_full |
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 |
| title_fullStr |
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 |
| title_full_unstemmed |
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 |
| title_sort |
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 |
| url |
http://hdl.handle.net/20.500.12110/paper_01407791_v36_n12_p2163_Bucci |
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