Seedling drought stress susceptibility in two deciduous Nothofagus species of NW Patagonia
The physiological capacities of seedlings to cope with drought may be subject to strong selective pressure in the context of future climate scenarios, threatening the regeneration and sustainability of forests. Characterization of the responses and the variability between species is of interest to breeding and domestication programs. In this study, our main goal was to describe some of the physiological mechanisms involved in the drought response of Nothofagus nervosa and N. obliqua, two forest species of ecological and commercial importance (high wood quality) in NW Patagonia. We tested for differences in water status, gas exchange and survival in response to a gradually imposed severe drought. Based on cavitation vulnerability curves and hydraulic conductivity measurements, we can conclude that N. obliqua stems have higher specific hydraulic conductivity and somewhat lower vulnerability to cavitation than N. nervosa stems, leading it to sustain higher stomatal conductance under non-severe drought conditions. N. obliqua had higher photosynthetic capacity than N. nervosa, due both to characteristics of its hydraulic architecture and to its higher metabolic capacity. Our results indicate that both species present characteristics of plants susceptible to water stress. Also, both species showed behavior resembling an anisohydric response. This behavior results from a lack of stomatal control over transpiration while the soil dehydrates, probably accompanied by very high vulnerability to cavitation. In contrast, both species had similar high stomatal sensitivity to vapor pressure deficit when soil water was limiting.
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Format: | info:ar-repo/semantics/artículo biblioteca |
Language: | eng |
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2010-06
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Subjects: | Nothofagus, Estrés de Sequia, Drought Stress, Seedlings, Stomatal Conductance, Plántulas, Conductancia Estomática, Región Patagónica, |
Online Access: | http://hdl.handle.net/20.500.12123/1617 https://link.springer.com/article/10.1007/s00468-010-0412-2 https://doi.org/10.1007/s00468-010-0412-2 |
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oai:localhost:20.500.12123-16172021-03-09T15:55:46Z Seedling drought stress susceptibility in two deciduous Nothofagus species of NW Patagonia Varela, Santiago Agustin Gyenge, Javier Enrique Fernandez, María Elena Schlichter, Tomas Miguel Nothofagus Estrés de Sequia Drought Stress Seedlings Stomatal Conductance Plántulas Conductancia Estomática Región Patagónica The physiological capacities of seedlings to cope with drought may be subject to strong selective pressure in the context of future climate scenarios, threatening the regeneration and sustainability of forests. Characterization of the responses and the variability between species is of interest to breeding and domestication programs. In this study, our main goal was to describe some of the physiological mechanisms involved in the drought response of Nothofagus nervosa and N. obliqua, two forest species of ecological and commercial importance (high wood quality) in NW Patagonia. We tested for differences in water status, gas exchange and survival in response to a gradually imposed severe drought. Based on cavitation vulnerability curves and hydraulic conductivity measurements, we can conclude that N. obliqua stems have higher specific hydraulic conductivity and somewhat lower vulnerability to cavitation than N. nervosa stems, leading it to sustain higher stomatal conductance under non-severe drought conditions. N. obliqua had higher photosynthetic capacity than N. nervosa, due both to characteristics of its hydraulic architecture and to its higher metabolic capacity. Our results indicate that both species present characteristics of plants susceptible to water stress. Also, both species showed behavior resembling an anisohydric response. This behavior results from a lack of stomatal control over transpiration while the soil dehydrates, probably accompanied by very high vulnerability to cavitation. In contrast, both species had similar high stomatal sensitivity to vapor pressure deficit when soil water was limiting. Fil: Varela, Santiago Agustin Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Grupo de Ecología Forestal; Argentina Fil: Gyenge, Javier Enrique. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Grupo de Ecología Forestal; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Fernandez, María Elena. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Grupo de Ecología Forestal; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Schlichter, Tomas Miguel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche. Grupo de Ecología Forestal; Argentina 2017-10-30T12:54:24Z 2017-10-30T12:54:24Z 2010-06 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/1617 https://link.springer.com/article/10.1007/s00468-010-0412-2 0931-1890 (Print) 1432-2285 (Online) https://doi.org/10.1007/s00468-010-0412-2 eng info:eu-repo/semantics/openAccess application/pdf Trees : structure and function 24 (3) : 443–453. (June 2010) |
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Nothofagus Estrés de Sequia Drought Stress Seedlings Stomatal Conductance Plántulas Conductancia Estomática Región Patagónica Nothofagus Estrés de Sequia Drought Stress Seedlings Stomatal Conductance Plántulas Conductancia Estomática Región Patagónica |
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Nothofagus Estrés de Sequia Drought Stress Seedlings Stomatal Conductance Plántulas Conductancia Estomática Región Patagónica Nothofagus Estrés de Sequia Drought Stress Seedlings Stomatal Conductance Plántulas Conductancia Estomática Región Patagónica Varela, Santiago Agustin Gyenge, Javier Enrique Fernandez, María Elena Schlichter, Tomas Miguel Seedling drought stress susceptibility in two deciduous Nothofagus species of NW Patagonia |
description |
The physiological capacities of seedlings to cope with drought may be subject to strong selective pressure in the context of future climate scenarios, threatening the regeneration and sustainability of forests. Characterization of the responses and the variability between species is of interest to breeding and domestication programs. In this study, our main goal was to describe some of the physiological mechanisms involved in the drought response of Nothofagus nervosa and N. obliqua, two forest species of ecological and commercial importance (high wood quality) in NW Patagonia. We tested for differences in water status, gas exchange and survival in response to a gradually imposed severe drought. Based on cavitation vulnerability curves and hydraulic conductivity measurements, we can conclude that N. obliqua stems have higher specific hydraulic conductivity and somewhat lower vulnerability to cavitation than N. nervosa stems, leading it to sustain higher stomatal conductance under non-severe drought conditions. N. obliqua had higher photosynthetic capacity than N. nervosa, due both to characteristics of its hydraulic architecture and to its higher metabolic capacity. Our results indicate that both species present characteristics of plants susceptible to water stress. Also, both species showed behavior resembling an anisohydric response. This behavior results from a lack of stomatal control over transpiration while the soil dehydrates, probably accompanied by very high vulnerability to cavitation. In contrast, both species had similar high stomatal sensitivity to vapor pressure deficit when soil water was limiting. |
format |
info:ar-repo/semantics/artículo |
topic_facet |
Nothofagus Estrés de Sequia Drought Stress Seedlings Stomatal Conductance Plántulas Conductancia Estomática Región Patagónica |
author |
Varela, Santiago Agustin Gyenge, Javier Enrique Fernandez, María Elena Schlichter, Tomas Miguel |
author_facet |
Varela, Santiago Agustin Gyenge, Javier Enrique Fernandez, María Elena Schlichter, Tomas Miguel |
author_sort |
Varela, Santiago Agustin |
title |
Seedling drought stress susceptibility in two deciduous Nothofagus species of NW Patagonia |
title_short |
Seedling drought stress susceptibility in two deciduous Nothofagus species of NW Patagonia |
title_full |
Seedling drought stress susceptibility in two deciduous Nothofagus species of NW Patagonia |
title_fullStr |
Seedling drought stress susceptibility in two deciduous Nothofagus species of NW Patagonia |
title_full_unstemmed |
Seedling drought stress susceptibility in two deciduous Nothofagus species of NW Patagonia |
title_sort |
seedling drought stress susceptibility in two deciduous nothofagus species of nw patagonia |
publishDate |
2010-06 |
url |
http://hdl.handle.net/20.500.12123/1617 https://link.springer.com/article/10.1007/s00468-010-0412-2 https://doi.org/10.1007/s00468-010-0412-2 |
work_keys_str_mv |
AT varelasantiagoagustin seedlingdroughtstresssusceptibilityintwodeciduousnothofagusspeciesofnwpatagonia AT gyengejavierenrique seedlingdroughtstresssusceptibilityintwodeciduousnothofagusspeciesofnwpatagonia AT fernandezmariaelena seedlingdroughtstresssusceptibilityintwodeciduousnothofagusspeciesofnwpatagonia AT schlichtertomasmiguel seedlingdroughtstresssusceptibilityintwodeciduousnothofagusspeciesofnwpatagonia |
_version_ |
1756007029742239744 |