Unraveling the effects of plant hydraulics on stomatal closure during water stress in walnut

The objectives of the study were to identify the relevant hydraulic parameters associated with stomatal regulation during water stress and to test the hypothesis of a stomatal control of xylem embolism in walnut (Juglans regia× nigra) trees. The hydraulic characteristics of the sap pathway were expe...

Descripción completa

Detalles Bibliográficos
Autores: Cochard, Hervé, Coll Mir, Lluís, Le Roux, Xavier, Améglio, Thierry
Tipo de recurso: artículo
Estado:Versión enviada para evaluación y publicación
Fecha de publicación:2002
País:España
Institución:Universitat de Lleida (UdL)
Repositorio:Repositori Obert UdL
OAI Identifier:oai:repositori.udl.cat:10459.1/68267
Acceso en línea:https://doi.org/10.1104/pp.010400
http://hdl.handle.net/10459.1/68267
Access Level:acceso abierto
Palabra clave:Drought stress
Hydraulic conductance
Stomatal regulation
Water relations
Water potential
id ES_da00aad03ad2ea2b022b2dcd39597b51
oai_identifier_str oai:repositori.udl.cat:10459.1/68267
network_acronym_str ES
network_name_str España
repository_id_str
spelling Unraveling the effects of plant hydraulics on stomatal closure during water stress in walnutCochard, HervéColl Mir, LluísLe Roux, XavierAméglio, ThierryDrought stressHydraulic conductanceStomatal regulationWater relationsWater potentialThe objectives of the study were to identify the relevant hydraulic parameters associated with stomatal regulation during water stress and to test the hypothesis of a stomatal control of xylem embolism in walnut (Juglans regia× nigra) trees. The hydraulic characteristics of the sap pathway were experimentally altered with different methods to alter plant transpiration (E plant) and stomatal conductance (g s). Potted trees were exposed to a soil water depletion to alter soil water potential (Ψsoil), soil resistance (R soil), and root hydraulic resistances (R root). Soil temperature was changed to alter R root alone. Embolism was created in the trunk to increase shoot resistance (R shoot). Stomata closed in response to these stresses with the effect of maintaining the water pressure in the leaf rachis xylem (P rachis) above −1.4 MPa and the leaf water potential (Ψleaf) above −1.6 MPa. The same dependence of E plant andg s on P rachis or Ψleaf was always observed. This suggested that stomata were not responding to changes in Ψsoil,R soil, R root, orR shoot per se but rather to their impact onP rachis and/or Ψleaf. Leaf rachis was the most vulnerable organ, with a thresholdP rachis for embolism induction of −1.4 MPa. The minimum Ψleaf values corresponded to leaf turgor loss point. This suggested that stomata are responding to leaf water status as determined by transpiration rate and plant hydraulics and thatP rachis might be the physiological parameter regulated by stomatal closure during water stress, which would have the effect of preventing extensive developments of cavitation during water stress.American Society of Plant Biologists2002info:eu-repo/semantics/articleinfo:eu-repo/semantics/submittedVersionhttps://doi.org/10.1104/pp.010400http://hdl.handle.net/10459.1/68267reponame:Repositori Obert UdL instname:Universitat de Lleida (UdL)InglésVersió preprint del document publicat a: https://doi.org/10.1104/pp.010400Plant Physiology, 2002, vol. 128, núm. 1, p. 282-290(c) American Society of Plant Biologists, 2002info:eu-repo/semantics/openAccessoai:repositori.udl.cat:10459.1/682672026-06-24T12:42:17Z
dc.title.none.fl_str_mv Unraveling the effects of plant hydraulics on stomatal closure during water stress in walnut
title Unraveling the effects of plant hydraulics on stomatal closure during water stress in walnut
spellingShingle Unraveling the effects of plant hydraulics on stomatal closure during water stress in walnut
Cochard, Hervé
Drought stress
Hydraulic conductance
Stomatal regulation
Water relations
Water potential
title_short Unraveling the effects of plant hydraulics on stomatal closure during water stress in walnut
title_full Unraveling the effects of plant hydraulics on stomatal closure during water stress in walnut
title_fullStr Unraveling the effects of plant hydraulics on stomatal closure during water stress in walnut
title_full_unstemmed Unraveling the effects of plant hydraulics on stomatal closure during water stress in walnut
title_sort Unraveling the effects of plant hydraulics on stomatal closure during water stress in walnut
dc.creator.none.fl_str_mv Cochard, Hervé
Coll Mir, Lluís
Le Roux, Xavier
Améglio, Thierry
author Cochard, Hervé
author_facet Cochard, Hervé
Coll Mir, Lluís
Le Roux, Xavier
Améglio, Thierry
author_role author
author2 Coll Mir, Lluís
Le Roux, Xavier
Améglio, Thierry
author2_role author
author
author
dc.subject.none.fl_str_mv Drought stress
Hydraulic conductance
Stomatal regulation
Water relations
Water potential
topic Drought stress
Hydraulic conductance
Stomatal regulation
Water relations
Water potential
description The objectives of the study were to identify the relevant hydraulic parameters associated with stomatal regulation during water stress and to test the hypothesis of a stomatal control of xylem embolism in walnut (Juglans regia× nigra) trees. The hydraulic characteristics of the sap pathway were experimentally altered with different methods to alter plant transpiration (E plant) and stomatal conductance (g s). Potted trees were exposed to a soil water depletion to alter soil water potential (Ψsoil), soil resistance (R soil), and root hydraulic resistances (R root). Soil temperature was changed to alter R root alone. Embolism was created in the trunk to increase shoot resistance (R shoot). Stomata closed in response to these stresses with the effect of maintaining the water pressure in the leaf rachis xylem (P rachis) above −1.4 MPa and the leaf water potential (Ψleaf) above −1.6 MPa. The same dependence of E plant andg s on P rachis or Ψleaf was always observed. This suggested that stomata were not responding to changes in Ψsoil,R soil, R root, orR shoot per se but rather to their impact onP rachis and/or Ψleaf. Leaf rachis was the most vulnerable organ, with a thresholdP rachis for embolism induction of −1.4 MPa. The minimum Ψleaf values corresponded to leaf turgor loss point. This suggested that stomata are responding to leaf water status as determined by transpiration rate and plant hydraulics and thatP rachis might be the physiological parameter regulated by stomatal closure during water stress, which would have the effect of preventing extensive developments of cavitation during water stress.
publishDate 2002
dc.date.none.fl_str_mv 2002
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/submittedVersion
format article
status_str submittedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1104/pp.010400
http://hdl.handle.net/10459.1/68267
url https://doi.org/10.1104/pp.010400
http://hdl.handle.net/10459.1/68267
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió preprint del document publicat a: https://doi.org/10.1104/pp.010400
Plant Physiology, 2002, vol. 128, núm. 1, p. 282-290
dc.rights.none.fl_str_mv (c) American Society of Plant Biologists, 2002
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Society of Plant Biologists, 2002
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Society of Plant Biologists
publisher.none.fl_str_mv American Society of Plant Biologists
dc.source.none.fl_str_mv reponame:Repositori Obert UdL
instname:Universitat de Lleida (UdL)
instname_str Universitat de Lleida (UdL)
reponame_str Repositori Obert UdL
collection Repositori Obert UdL
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869421488751247360
score 15,811543

Similares en LA Referencia