Influence of radiation and drought on gas exchange of Austrocedrus chilensis seedlings

Austrocedrus chilensis is a conifer from Patagonia adapted to a wide moisture gradient. In xeric environments, its natural or artificial recruitment only occurs under nurse shrubs during normal rainfall years. In spite of its importance in ecological and economical terms, little information is avail...

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Autores principales: Gyenge,Javier Enrique, Fernández,María Elena, Schlichter,Tomás
Lenguaje:English
Publicado: Universidad Austral de Chile, Facultad de Ciencias Forestales 2007
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Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-92002007000300006
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spelling oai:scielo:S0717-920020070003000062008-04-14Influence of radiation and drought on gas exchange of Austrocedrus chilensis seedlingsGyenge,Javier EnriqueFernández,María ElenaSchlichter,Tomás photosynthesis stomatal conductance transpiration instantaneous water use efficiency Austrocedrus chilensis is a conifer from Patagonia adapted to a wide moisture gradient. In xeric environments, its natural or artificial recruitment only occurs under nurse shrubs during normal rainfall years. In spite of its importance in ecological and economical terms, little information is available about the physiology of this species. Previous field measurements in experimental plantation revealed that seedlings without plant cover had lower survival, photo synthetic rates and predawn water potential than those planted under trees. So, the response of stomata to radiation and vapor pressure deficit, and the effect of drought stress on photosynthesis and transpiration of A. chilensis seedlings were studied under controlled conditions. Even when soil water was not limiting, all seedlings showed an early stomatal closure in response to moderate evaporative demand. Photo synthetic parameters and instantaneous water use efficiency suggested that microenvironments with intermediate shade are the best for A. chilensis C0(2) uptake. We suggest that the early stomatal closure could result in damage in leaves or the base of the stem by oveheating, explaining low survival when grown without shade. As a whole, our results may contribute to understanding the need for nurse plants in the establishment of the speciesinfo:eu-repo/semantics/openAccessUniversidad Austral de Chile, Facultad de Ciencias ForestalesBosque (Valdivia) v.28 n.3 20072007-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-92002007000300006en10.4067/S0717-92002007000300006
institution Scielo Chile
collection Scielo Chile
language English
topic photosynthesis
stomatal conductance
transpiration
instantaneous water use efficiency
spellingShingle photosynthesis
stomatal conductance
transpiration
instantaneous water use efficiency
Gyenge,Javier Enrique
Fernández,María Elena
Schlichter,Tomás
Influence of radiation and drought on gas exchange of Austrocedrus chilensis seedlings
description Austrocedrus chilensis is a conifer from Patagonia adapted to a wide moisture gradient. In xeric environments, its natural or artificial recruitment only occurs under nurse shrubs during normal rainfall years. In spite of its importance in ecological and economical terms, little information is available about the physiology of this species. Previous field measurements in experimental plantation revealed that seedlings without plant cover had lower survival, photo synthetic rates and predawn water potential than those planted under trees. So, the response of stomata to radiation and vapor pressure deficit, and the effect of drought stress on photosynthesis and transpiration of A. chilensis seedlings were studied under controlled conditions. Even when soil water was not limiting, all seedlings showed an early stomatal closure in response to moderate evaporative demand. Photo synthetic parameters and instantaneous water use efficiency suggested that microenvironments with intermediate shade are the best for A. chilensis C0(2) uptake. We suggest that the early stomatal closure could result in damage in leaves or the base of the stem by oveheating, explaining low survival when grown without shade. As a whole, our results may contribute to understanding the need for nurse plants in the establishment of the species
author Gyenge,Javier Enrique
Fernández,María Elena
Schlichter,Tomás
author_facet Gyenge,Javier Enrique
Fernández,María Elena
Schlichter,Tomás
author_sort Gyenge,Javier Enrique
title Influence of radiation and drought on gas exchange of Austrocedrus chilensis seedlings
title_short Influence of radiation and drought on gas exchange of Austrocedrus chilensis seedlings
title_full Influence of radiation and drought on gas exchange of Austrocedrus chilensis seedlings
title_fullStr Influence of radiation and drought on gas exchange of Austrocedrus chilensis seedlings
title_full_unstemmed Influence of radiation and drought on gas exchange of Austrocedrus chilensis seedlings
title_sort influence of radiation and drought on gas exchange of austrocedrus chilensis seedlings
publisher Universidad Austral de Chile, Facultad de Ciencias Forestales
publishDate 2007
url http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-92002007000300006
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AT schlichtertomas influenceofradiationanddroughtongasexchangeofaustrocedruschilensisseedlings
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