Osmotic and elastic adjustments in cold desert shrubs differing in rooting depth: Coping with drought and subzero temperatures

Physiological adjustments to enhance tolerance or avoidance of summer drought and winter freezing were studied in shallow to deep-rooted Patagonian cold desert shrubs. We measured leaf water potential (ΨL), osmotic potential, tissue elasticity, stem hydraulic characteristics, and stomatal conductanc...

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Autores principales:	Scholz, Fabián Gustavo, Bucci, Sandra Janet, Goldstein, Guillermo Hernan
Publicado:	2012
Materias:	Elastic modulus Hydraulic conductivity Stomatal conductance Tissue injury Water relationships adaptation cytology desert drought stress elastic modulus freeze tolerance hydraulic conductivity injury low temperature osmosis physiological response plant water relations rooting seasonal variation shrub stem stomatal conductance tolerance article cold electrolyte balance physiology plant physiology plant root Adaptation, Physiological Cold Temperature Osmosis Plant Physiological Phenomena Plant Roots Water-Electrolyte Balance
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00298549_v170_n4_p885_Scholz http://hdl.handle.net/20.500.12110/paper_00298549_v170_n4_p885_Scholz
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00298549_v170_n4_p885_Scholz
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spelling	paper:paper_00298549_v170_n4_p885_Scholz2023-06-08T14:55:38Z Osmotic and elastic adjustments in cold desert shrubs differing in rooting depth: Coping with drought and subzero temperatures Scholz, Fabián Gustavo Bucci, Sandra Janet Goldstein, Guillermo Hernan Elastic modulus Hydraulic conductivity Stomatal conductance Tissue injury Water relationships adaptation cytology desert drought stress elastic modulus freeze tolerance hydraulic conductivity injury low temperature osmosis physiological response plant water relations rooting seasonal variation shrub stem stomatal conductance tolerance adaptation article cold electrolyte balance osmosis physiology plant physiology plant root Adaptation, Physiological Cold Temperature Osmosis Plant Physiological Phenomena Plant Roots Water-Electrolyte Balance Physiological adjustments to enhance tolerance or avoidance of summer drought and winter freezing were studied in shallow to deep-rooted Patagonian cold desert shrubs. We measured leaf water potential (ΨL), osmotic potential, tissue elasticity, stem hydraulic characteristics, and stomatal conductance (gS) across species throughout the year, and assessed tissue damage by subzero temperatures during winter. Species behavior was highly dependent on rooting depth. Substantial osmotic adjustment (up to 1. 2 MPa) was observed in deep-rooted species exhibiting relatively small seasonal variations in ΨL and with access to a more stable water source, but having a large difference between predawn and midday ΨL. On the other hand, shallow-rooted species exposed to large seasonal changes in ΨL showed limited osmotic adjustment and incomplete stomatal closure, resulting in turgor loss during periods of drought. The bulk leaf tissue elastic modulus (ε) was lower in species with relatively shallow roots. Daily variation in gS was larger in shallow-rooted species (more than 50 % of its maximum) and was negatively associated with the difference between ΨL at the turgor loss point and minimum ΨL (safety margin for turgor maintenance). All species increased ε by about 10 MPa during winter. Species with rigid tissue walls exhibited low leaf tissue damage at -20 °C. Our results suggest that osmotic adjustment was the main water relationship adaptation to cope with drought during summer and spring, particularly in deep-rooted plants, and that adjustments in cell wall rigidity during the winter helped to enhance freezing tolerance. © 2012 Springer-Verlag. Fil:Scholz, F.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bucci, S.J. 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. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00298549_v170_n4_p885_Scholz http://hdl.handle.net/20.500.12110/paper_00298549_v170_n4_p885_Scholz
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Elastic modulus Hydraulic conductivity Stomatal conductance Tissue injury Water relationships adaptation cytology desert drought stress elastic modulus freeze tolerance hydraulic conductivity injury low temperature osmosis physiological response plant water relations rooting seasonal variation shrub stem stomatal conductance tolerance adaptation article cold electrolyte balance osmosis physiology plant physiology plant root Adaptation, Physiological Cold Temperature Osmosis Plant Physiological Phenomena Plant Roots Water-Electrolyte Balance
spellingShingle	Elastic modulus Hydraulic conductivity Stomatal conductance Tissue injury Water relationships adaptation cytology desert drought stress elastic modulus freeze tolerance hydraulic conductivity injury low temperature osmosis physiological response plant water relations rooting seasonal variation shrub stem stomatal conductance tolerance adaptation article cold electrolyte balance osmosis physiology plant physiology plant root Adaptation, Physiological Cold Temperature Osmosis Plant Physiological Phenomena Plant Roots Water-Electrolyte Balance Scholz, Fabián Gustavo Bucci, Sandra Janet Goldstein, Guillermo Hernan Osmotic and elastic adjustments in cold desert shrubs differing in rooting depth: Coping with drought and subzero temperatures
topic_facet	Elastic modulus Hydraulic conductivity Stomatal conductance Tissue injury Water relationships adaptation cytology desert drought stress elastic modulus freeze tolerance hydraulic conductivity injury low temperature osmosis physiological response plant water relations rooting seasonal variation shrub stem stomatal conductance tolerance adaptation article cold electrolyte balance osmosis physiology plant physiology plant root Adaptation, Physiological Cold Temperature Osmosis Plant Physiological Phenomena Plant Roots Water-Electrolyte Balance
description	Physiological adjustments to enhance tolerance or avoidance of summer drought and winter freezing were studied in shallow to deep-rooted Patagonian cold desert shrubs. We measured leaf water potential (ΨL), osmotic potential, tissue elasticity, stem hydraulic characteristics, and stomatal conductance (gS) across species throughout the year, and assessed tissue damage by subzero temperatures during winter. Species behavior was highly dependent on rooting depth. Substantial osmotic adjustment (up to 1. 2 MPa) was observed in deep-rooted species exhibiting relatively small seasonal variations in ΨL and with access to a more stable water source, but having a large difference between predawn and midday ΨL. On the other hand, shallow-rooted species exposed to large seasonal changes in ΨL showed limited osmotic adjustment and incomplete stomatal closure, resulting in turgor loss during periods of drought. The bulk leaf tissue elastic modulus (ε) was lower in species with relatively shallow roots. Daily variation in gS was larger in shallow-rooted species (more than 50 % of its maximum) and was negatively associated with the difference between ΨL at the turgor loss point and minimum ΨL (safety margin for turgor maintenance). All species increased ε by about 10 MPa during winter. Species with rigid tissue walls exhibited low leaf tissue damage at -20 °C. Our results suggest that osmotic adjustment was the main water relationship adaptation to cope with drought during summer and spring, particularly in deep-rooted plants, and that adjustments in cell wall rigidity during the winter helped to enhance freezing tolerance. © 2012 Springer-Verlag.
author	Scholz, Fabián Gustavo Bucci, Sandra Janet Goldstein, Guillermo Hernan
author_facet	Scholz, Fabián Gustavo Bucci, Sandra Janet Goldstein, Guillermo Hernan
author_sort	Scholz, Fabián Gustavo
title	Osmotic and elastic adjustments in cold desert shrubs differing in rooting depth: Coping with drought and subzero temperatures
title_short	Osmotic and elastic adjustments in cold desert shrubs differing in rooting depth: Coping with drought and subzero temperatures
title_full	Osmotic and elastic adjustments in cold desert shrubs differing in rooting depth: Coping with drought and subzero temperatures
title_fullStr	Osmotic and elastic adjustments in cold desert shrubs differing in rooting depth: Coping with drought and subzero temperatures
title_full_unstemmed	Osmotic and elastic adjustments in cold desert shrubs differing in rooting depth: Coping with drought and subzero temperatures
title_sort	osmotic and elastic adjustments in cold desert shrubs differing in rooting depth: coping with drought and subzero temperatures
publishDate	2012
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00298549_v170_n4_p885_Scholz http://hdl.handle.net/20.500.12110/paper_00298549_v170_n4_p885_Scholz
work_keys_str_mv	AT scholzfabiangustavo osmoticandelasticadjustmentsincolddesertshrubsdifferinginrootingdepthcopingwithdroughtandsubzerotemperatures AT buccisandrajanet osmoticandelasticadjustmentsincolddesertshrubsdifferinginrootingdepthcopingwithdroughtandsubzerotemperatures AT goldsteinguillermohernan osmoticandelasticadjustmentsincolddesertshrubsdifferinginrootingdepthcopingwithdroughtandsubzerotemperatures
_version_	1768541740079251456

Osmotic and elastic adjustments in cold desert shrubs differing in rooting depth: Coping with drought and subzero temperatures

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