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...
| Autores: | , , , |
|---|---|
| Tipo de documento: | artigo |
| Estado: | Versión enviada para evaluación y publicación |
| Data de publicação: | 2002 |
| País: | España |
| Recursos: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositório: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:10459.1/68267 |
| Acesso em linha: | https://doi.org/10.1104/pp.010400 http://hdl.handle.net/10459.1/68267 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Drought stress Hydraulic conductance Stomatal regulation Water relations Water potential |
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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 Biologists202020202002info:eu-repo/semantics/articleinfo:eu-repo/semantics/submittedVersionhttps://doi.org/10.1104/pp.010400http://hdl.handle.net/10459.1/68267http://hdl.handle.net/10459.1/68267reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)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:recercat.cat:10459.1/682672026-05-29T05:05:01Z |
| 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 2020 2020 |
| 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 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:Recercat. Dipósit de la Recerca de Catalunya instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
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Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
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Recercat. Dipósit de la Recerca de Catalunya |
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Recercat. Dipósit de la Recerca de Catalunya |
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15.811543 |